Allow Filter_Condition to be inverted. (#8861)

- Various linting fixes (doc comments and type annotations etc.).
- Add an action to determine if a `Filter_Condition` is keep or remove.

https://github.com/enso-org/enso/assets/4699705/69ba2bd3-8893-4237-acc4-eb01f534a209

- Remove `Not_In`, `Not_Contains` and `Not_Like` from `Filter_Condition`.

- Ability to use an `Expression` as a `Column_Ref`.

https://github.com/enso-org/enso/assets/4699705/16a2e030-f8f9-4f59-beca-2646f56fcb90

CHANGELOG.md

@@ -612,6 +612,7 @@
 - [Added `File_By_Line` type allowing processing a file line by line. New faster
   JSON parser based off Jackson.][8719]
 - [Implemented `Table.replace` for the in-memory backend.][8935]
+- [Allow removing rows using a Filter_Condition.][8861]
 
 [debug-shortcuts]:
   https://github.com/enso-org/enso/blob/develop/app/gui/docs/product/shortcuts.md#debug
@@ -880,6 +881,7 @@
 [8849]: https://github.com/enso-org/enso/pull/8849
 [8865]: https://github.com/enso-org/enso/pull/8865
 [8935]: https://github.com/enso-org/enso/pull/8935
+[8861]: https://github.com/enso-org/enso/pull/8861
 
 #### Enso Compiler
 

distribution/lib/Standard/AWS/0.0.0-dev/src/AWS_Credential.enso

@@ -1,9 +1,9 @@
 from Standard.Base import all
-from Standard.Base.Metadata import make_single_choice, Widget
 from Standard.Base.Data.Enso_Cloud.Enso_Secret import as_hideable_value
+from Standard.Base.Metadata import make_single_choice, Widget
 
-polyglot java import org.enso.aws.ProfileReader
 polyglot java import org.enso.aws.AwsCredential
+polyglot java import org.enso.aws.ProfileReader
 
 type AWS_Credential
     ## Access using IAM via an AWS profile.
@@ -32,7 +32,7 @@ type AWS_Credential
         make_single_choice [["default", "Nothing"], ["by profile", fqn + ".Profile"], ["by key", fqn + ".Key"]]
 
     ## PRIVATE
-    as_java : AWS_Credential|Nothing -> AwsCredential
+    as_java : AWS_Credential | Nothing -> AwsCredential
     as_java (credential : AWS_Credential | Nothing) = case credential of
         AWS_Credential.Profile profile -> AwsCredential.Profile.new profile
         AWS_Credential.Key access_key_id secret_access_key ->

distribution/lib/Standard/Base/0.0.0-dev/src/Data.enso

@@ -146,7 +146,7 @@ read_text path (encoding=Encoding.utf_8) (on_problems=Problem_Behavior.Report_Wa
          example_list_files =
              Data.list_directory Examples.data_dir name_filter="**.md" recursive=True
 list_directory : File -> Text | Nothing -> Boolean -> Vector File
-list_directory directory:File name_filter:Text|Nothing=Nothing recursive:Boolean=False =
+list_directory directory:File (name_filter:(Text | Nothing)=Nothing) recursive:Boolean=False =
     directory . list name_filter=name_filter recursive=recursive
 
 ## ALIAS download, http get

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Base_64.enso

@@ -1,5 +1,5 @@
-import project.Data.Text.Text
 import project.Data.Text.Encoding.Encoding
+import project.Data.Text.Text
 import project.Errors.Encoding_Error.Encoding_Error
 from project.Data.Text.Extensions import all
 

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Enso_Cloud/Enso_File.enso

@@ -255,7 +255,7 @@ type Enso_File
 
     ## UNSTABLE
        Resolves a file or directory within this directory.
-    / : Text -> Enso_File
+    / : Text -> Enso_File ! Not_Found
     / self (name : Text) -> Enso_File ! Not_Found =
         if self.is_directory.not then Error.throw (Illegal_Argument.Error "/ can only be used for directories") else
             if name.contains "/" then Error.throw (Illegal_Argument.Error "Resolving sub-paths (/) is not implemented. Temporary workaround: use the `/` operator multiple times.") else

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Enso_Cloud/Enso_Secret.enso

@@ -1,6 +1,6 @@
 import project.Data.Base_64.Base_64
-import project.Data.Enso_Cloud.Enso_File.Enso_File
 import project.Data.Enso_Cloud.Enso_File.Enso_Asset_Type
+import project.Data.Enso_Cloud.Enso_File.Enso_File
 import project.Data.Enso_Cloud.Utils
 import project.Data.Json.JS_Object
 import project.Data.Text.Text
@@ -15,8 +15,8 @@ import project.Network.HTTP.Request_Body.Request_Body
 import project.Nothing.Nothing
 import project.Runtime.Context
 from project.Data.Boolean import Boolean, False, True
-from project.Data.Text.Extensions import all
 from project.Data.Enso_Cloud.Enso_File import list_assets
+from project.Data.Text.Extensions import all
 
 polyglot java import org.enso.base.enso_cloud.EnsoSecretHelper
 polyglot java import org.enso.base.enso_cloud.HideableValue
@@ -165,7 +165,7 @@ Derived_Secret_Value.from (that : Text) = Derived_Secret_Value.Plain_Text that
 Derived_Secret_Value.from (that : Enso_Secret) = Derived_Secret_Value.Secret_Value that
 
 ## PRIVATE
-as_hideable_value : Text | Enso_Secret | Nothing -> HideableValue
+as_hideable_value : Text | Enso_Secret | Derived_Secret_Value -> HideableValue
 as_hideable_value (value : Text | Enso_Secret | Derived_Secret_Value) = case value of
     text : Text -> HideableValue.PlainValue.new text
     secret : Enso_Secret -> HideableValue.SecretValue.new secret.id

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Enso_Cloud/Utils.enso

@@ -1,6 +1,7 @@
 private
-import project.Data.Enso_Cloud.Enso_Secret.Enso_Secret
+
 import project.Data.Enso_Cloud.Enso_Secret.Derived_Secret_Value
+import project.Data.Enso_Cloud.Enso_Secret.Enso_Secret
 import project.Data.Enso_Cloud.Errors.Not_Logged_In
 import project.Data.Pair.Pair
 import project.Data.Text.Text

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Filter_Condition.enso

@@ -21,25 +21,25 @@ polyglot java import org.enso.base.Regex_Utils
 
 type Filter_Condition
     ## Is less than a value (or another column, in case of Table operations)?
-    Less than:Any
+    Less than:Any action:Filter_Action=Filter_Action.Keep
 
     ## Is less than or equal to a value (or another column, in case of Table operations)?
-    Equal_Or_Less than:Any
+    Equal_Or_Less than:Any action:Filter_Action=Filter_Action.Keep
 
     ## Is equal to a value (or another column, in case of Table operations)?
-    Equal to:Any
+    Equal to:Any action:Filter_Action=Filter_Action.Keep
 
     ## Is greater than or equal to a value (or another column, in case of Table operations)?
-    Equal_Or_Greater than:Any
+    Equal_Or_Greater than:Any action:Filter_Action=Filter_Action.Keep
 
     ## Is greater than a value (or another column, in case of Table operations)?
-    Greater than:Any
+    Greater than:Any action:Filter_Action=Filter_Action.Keep
 
     ## Is not equal to a value (or another column, in case of Table operations)?
-    Not_Equal to:Any
+    Not_Equal to:Any action:Filter_Action=Filter_Action.Keep
 
     ## Is between (inclusive) two values (or columns, in case of Table operations)?
-    Between lower:Any upper:Any
+    Between lower:Any upper:Any action:Filter_Action=Filter_Action.Keep
 
     ## Is equal to another value, ignoring case (Text only)?
 
@@ -54,7 +54,7 @@ type Filter_Condition
          This ensures that different ways of expressing the same character in
          the underlying binary representation are considered equal.
     @locale Locale.default_widget
-    Equal_Ignore_Case (to : Text | Any) (locale:Locale=Locale.default)
+    Equal_Ignore_Case (to : Text | Any) (locale:Locale=Locale.default) action:Filter_Action=Filter_Action.Keep
 
     ## Does the value start with a prefix (Text only)?
 
@@ -62,7 +62,7 @@ type Filter_Condition
          It accepts a Text value to check if the value contains it. In case of
          Table operations, it can accept another column - then the corresponding
          values from the source column and the provided column are checked.
-    Starts_With (prefix : Text | Any) (case_sensitivity:Case_Sensitivity=Case_Sensitivity.Default)
+    Starts_With (prefix : Text | Any) (case_sensitivity:Case_Sensitivity=Case_Sensitivity.Default) action:Filter_Action=Filter_Action.Keep
 
     ## Does the value end with a suffix (Text only)?
 
@@ -70,7 +70,7 @@ type Filter_Condition
          It accepts a Text value to check if the value contains it. In case of
          Table operations, it can accept another column - then the corresponding
          values from the source column and the provided column are checked.
-    Ends_With (suffix : Text | Any) (case_sensitivity:Case_Sensitivity=Case_Sensitivity.Default)
+    Ends_With (suffix : Text | Any) (case_sensitivity:Case_Sensitivity=Case_Sensitivity.Default) action:Filter_Action=Filter_Action.Keep
 
     ## Does the value contain the substring (Text only)?
 
@@ -78,44 +78,36 @@ type Filter_Condition
          It accepts a Text value to check if the value contains it. In case of
          Table operations, it can accept another column - then the corresponding
          values from the source column and the provided column are checked.
-    Contains (substring : Text | Any) (case_sensitivity:Case_Sensitivity=Case_Sensitivity.Default)
+    Contains (substring : Text | Any) (case_sensitivity:Case_Sensitivity=Case_Sensitivity.Default) action:Filter_Action=Filter_Action.Keep
-
-    ## Is the substring not present in the value (Text only)?
-
-       ? Table Operations
-         It accepts a Text value to check if the value contains it. In case of
-         Table operations, it can accept another column - then the corresponding
-         values from the source column and the provided column are checked.
-    Not_Contains (substring : Text | Any) (case_sensitivity:Case_Sensitivity=Case_Sensitivity.Default)
 
     ## Is equal to Nothing?
-    Is_Nothing
+    Is_Nothing action:Filter_Action=Filter_Action.Keep
 
     ## Is not equal to Nothing?
-    Not_Nothing
+    Not_Nothing action:Filter_Action=Filter_Action.Keep
 
     ## Is the value a NaN (Number only)?
-    Is_Nan
+    Is_Nan action:Filter_Action=Filter_Action.Keep
 
     ## Is the value infinite (Number only)?
-    Is_Infinite
+    Is_Infinite action:Filter_Action=Filter_Action.Keep
 
     ## Is the value finite (Number only)?
 
        Finite numbers are ones that are not infinite nor NaN.
-    Is_Finite
+    Is_Finite action:Filter_Action=Filter_Action.Keep
 
     ## Is the value equal to True (Boolean only)?
-    Is_True
+    Is_True action:Filter_Action=Filter_Action.Keep
 
     ## Is the value equal to False (Boolean only)?
-    Is_False
+    Is_False action:Filter_Action=Filter_Action.Keep
 
     ## Is equal to "" or Nothing (Text only)?
-    Is_Empty
+    Is_Empty action:Filter_Action=Filter_Action.Keep
 
     ## Is not equal to "" and Nothing (Text only)?
-    Not_Empty
+    Not_Empty action:Filter_Action=Filter_Action.Keep
 
     ## Does the value match the SQL pattern (Text only)?
 
@@ -134,26 +126,7 @@ type Filter_Condition
          Due to this limitation, Unicode normalization has been disabled for
          this function, so beware that some equivalent graphemes like 'ś' and
          's\u0301' will not be matched.
-    Like (pattern : Text | Any)
+    Like (pattern : Text | Any) action:Filter_Action=Filter_Action.Keep
-
-    ## Does the value not match the SQL pattern (Text only)?
-
-       The pattern is interpreted according to the standard SQL convention:
-       - the `%` character matches any sequence of characters,
-       - the `_` character matches any single character,
-       - any other character is matched literally.
-
-       ? Table Operations
-         It accepts a Text value to check if the value contains it. In case of
-         Table operations, it can accept another column - then the corresponding
-         values from the source column and the provided column are checked.
-
-       ! Known Limitations.
-         The Truffle regex engine does not transparently handle normalization.
-         Due to this limitation, Unicode normalization has been disabled for
-         this function, so beware that some equivalent graphemes like 'ś' and
-         's\u0301' will not be matched.
-    Not_Like pattern:Text|Any
 
     ## Is the value contained in `values`?
 
@@ -167,21 +140,7 @@ type Filter_Condition
          Using Columns can be particularly useful for Database operations, as
          uploading a temporary table and using its column for an `Is_In` check
          will likely be faster than using the vector directly.
-    Is_In values:Vector|Any
+    Is_In values:Vector|Any action:Filter_Action=Filter_Action.Keep
-
-    ## Is the value not contained in `values`?
-
-       ? Table Operations
-         It accepts a `Vector` of values. In case of Table operations, it can
-         also accept another column - then it acts as if `column.to_vector` was
-         passed - i.e. every element of the original table's column is checked
-         if it is contained in the provided column. The columns can have
-         different lengths.
-
-         Using Columns can be particularly useful for Database operations, as
-         uploading a temporary table and using its column for an `Not_In` check
-         will likely be faster than using the vector directly.
-    Not_In values:(Vector | Any)
 
     ## Converts a `Filter_Condition` condition into a predicate taking an
        element and returning a value indicating whether the element should be
@@ -190,57 +149,45 @@ type Filter_Condition
        The predicate can handle `Nothing` values in all cases. However, the
        predicate will raise an error if the value is not of the expected type.
     to_predicate : (Any -> Boolean)
-    to_predicate self = case self of
+    to_predicate self =
-        # == does not need special handling for Nothing
+        base = case self of
-        Equal value -> ==value
+            # == does not need special handling for Nothing
-        Not_Equal value -> !=value
+            Equal value _ -> ==value
-        Less value -> handle_nothing (<value)
+            Not_Equal value _ -> !=value
-        Equal_Or_Less value -> handle_nothing (<=value)
+            Less value _ -> handle_nothing (<value)
-        Equal_Or_Greater value -> handle_nothing (>=value)
+            Equal_Or_Less value _ -> handle_nothing (<=value)
-        Greater value -> handle_nothing (>value)
+            Equal_Or_Greater value _ -> handle_nothing (>=value)
-        Between lower upper -> handle_nothing <| elem->
+            Greater value _ -> handle_nothing (>value)
-            (lower <= elem) && (elem <= upper)
+            Between lower upper _ -> handle_nothing <| elem->
-        Equal_Ignore_Case value locale ->
+                (lower <= elem) && (elem <= upper)
-            handle_nothing <| txt-> (txt : Text).equals_ignore_case value locale
+            Equal_Ignore_Case value locale _ ->
-        Starts_With prefix case_sensitivity ->
+                handle_nothing <| txt-> (txt : Text).equals_ignore_case value locale
-            handle_nothing <| txt-> (txt : Text).starts_with prefix case_sensitivity
+            Starts_With prefix case_sensitivity _ ->
-        Ends_With suffix case_sensitivity ->
+                handle_nothing <| txt-> (txt : Text).starts_with prefix case_sensitivity
-            handle_nothing <| txt-> (txt : Text).ends_with suffix case_sensitivity
+            Ends_With suffix case_sensitivity _ ->
-        Contains substring case_sensitivity ->
+                handle_nothing <| txt-> (txt : Text).ends_with suffix case_sensitivity
-            handle_nothing <| txt-> (txt : Text).contains substring case_sensitivity
+            Contains substring case_sensitivity _ ->
-        Not_Contains substring case_sensitivity ->
+                handle_nothing <| txt-> (txt : Text).contains substring case_sensitivity
-            handle_nothing <| txt-> (txt : Text).contains substring case_sensitivity . not
+            Is_Nothing _ -> elem -> case elem of
-        Is_Nothing -> elem -> case elem of
+                Nothing -> True
-            Nothing -> True
+                _ -> False
-            _ -> False
+            Not_Nothing _ -> elem -> case elem of
-        Not_Nothing -> elem -> case elem of
+                Nothing -> False
-            Nothing -> False
+                _ -> True
-            _ -> True
+            Is_Nan _ -> handle_nothing x-> (x:Number).is_nan
-        Is_Nan -> handle_nothing x-> (x:Number).is_nan
+            Is_Infinite _ -> handle_nothing x-> (x:Number).is_infinite
-        Is_Infinite -> handle_nothing x-> (x:Number).is_infinite
+            Is_Finite _ -> handle_nothing x-> (x:Number).is_finite
-        Is_Finite -> handle_nothing x-> (x:Number).is_finite
+            Is_True _ -> handle_nothing b-> (b:Boolean)==True
-        Is_True -> ==True
+            Is_False _ -> handle_nothing b-> (b:Boolean)==False
-        Is_False -> ==False
+            Is_Empty _ -> elem-> elem.is_nothing || (elem : Text)==""
-        Is_Empty -> elem -> case elem of
+            Not_Empty _ -> handle_nothing elem-> (elem : Text)!=""
-            Nothing -> True
+            Like sql_pattern _ ->
-            "" -> True
+                regex = sql_like_to_regex sql_pattern
-            _ -> False
+                handle_nothing <| regex.matches
-        Not_Empty -> elem -> case elem of
+            Is_In values _ ->
-            Nothing -> False
+                set = Set.from_vector values
-            "" -> False
+                set.contains
-            _ -> True
+        if self.action == Filter_Action.Keep then base else v -> (base v).not
-        Like sql_pattern ->
-            regex = sql_like_to_regex sql_pattern
-            handle_nothing <| regex.matches
-        Not_Like sql_pattern ->
-            regex = sql_like_to_regex sql_pattern
-            handle_nothing <| elem-> regex.matches elem . not
-        Is_In values ->
-            set = Set.from_vector values
-            set.contains
-        Not_In values ->
-            set = Set.from_vector values
-            elem-> set.contains elem . not
 
     ## PRIVATE
        Convert to a display representation of this Filter_Condition.
@@ -250,34 +197,31 @@ type Filter_Condition
             if case_sensitivity == Case_Sensitivity.Default then "" else " Case " + case_sensitivity.to_display_text
 
         condition = case self of
-            Less value -> "<" + value.to_display_text
+            Less value _ -> "<" + value.to_display_text
-            Equal_Or_Less value -> "<=" + value.to_display_text
+            Equal_Or_Less value _ -> "<=" + value.to_display_text
-            Equal value -> "==" + value.to_display_text
+            Equal value _ -> "==" + value.to_display_text
-            Equal_Or_Greater value -> ">=" + value.to_display_text
+            Equal_Or_Greater value _ -> ">=" + value.to_display_text
-            Greater value -> ">" + value.to_display_text
+            Greater value _ -> ">" + value.to_display_text
-            Not_Equal value -> "!=" + value.to_display_text
+            Not_Equal value _ -> "!=" + value.to_display_text
-            Between lower upper -> "Between " + lower.to_display_text + " And " + upper.to_display_text
+            Between lower upper _ -> "Between " + lower.to_display_text + " And " + upper.to_display_text
-            Equal_Ignore_Case value locale ->
+            Equal_Ignore_Case value locale _ ->
                 suffix = if locale == Locale.default then "" else " (within locale " + locale.to_display_text + ")"
                 "Equal Ignore Case " + value.to_display_text + suffix
-            Starts_With prefix case_sensitivity -> "Starts With " + prefix.to_display_text + (render_case case_sensitivity)
+            Starts_With prefix case_sensitivity _ -> "Starts With " + prefix.to_display_text + (render_case case_sensitivity)
-            Ends_With suffix case_sensitivity -> "Ends With " + suffix.to_display_text + (render_case case_sensitivity)
+            Ends_With suffix case_sensitivity _ -> "Ends With " + suffix.to_display_text + (render_case case_sensitivity)
-            Contains substring case_sensitivity -> "Contains " + substring.to_display_text + (render_case case_sensitivity)
+            Contains substring case_sensitivity _ -> "Contains " + substring.to_display_text + (render_case case_sensitivity)
-            Not_Contains substring case_sensitivity -> "not Contains " + substring.to_display_text + (render_case case_sensitivity)
+            Is_Nothing _ -> "is Nothing"
-            Is_Nothing -> "is Nothing"
+            Not_Nothing _ -> "is not Nothing"
-            Not_Nothing -> "is not Nothing"
+            Is_Nan _ -> "is NaN"
-            Is_Nan -> "is NaN"
+            Is_Infinite _ -> "is Infinite"
-            Is_Infinite -> "is Infinite"
+            Is_Finite _ -> "is Finite"
-            Is_Finite -> "is Finite"
+            Is_True _ -> "is True"
-            Is_True -> "is True"
+            Is_False _ -> "is False"
-            Is_False -> "is False"
+            Is_Empty _ -> "is Empty"
-            Is_Empty -> "is Empty"
+            Not_Empty _ -> "is not Empty"
-            Not_Empty -> "is not Empty"
+            Like sql_pattern _ -> "Like " + sql_pattern.to_display_text
-            Like sql_pattern -> "Like " + sql_pattern.to_display_text
+            Is_In values _ -> "is in " + values.to_display_text
-            Not_Like sql_pattern -> "not Like " + sql_pattern.to_display_text
+        "Filter Condition: " + condition + (if self.action == Filter_Action.Keep then "" else " (Remove)")
-            Is_In values -> "is in " + values.to_display_text
-            Not_In values -> "is not in " + values.to_display_text
-        "Filter Condition: " + condition
 
     ## PRIVATE
        Creates a Single_Choice Widget for delimiters.
@@ -309,11 +253,8 @@ type Filter_Condition
             options_builder.append "Starts_With"
             options_builder.append "Ends_With"
             options_builder.append "Contains"
-            options_builder.append "Not_Contains"
             options_builder.append "Like"
-            options_builder.append "Not_Like"
         options_builder.append "Is_In"
-        options_builder.append "Not_In"
 
         options = options_builder.to_vector.map constructor_name->
             name = constructor_name.replace "_" " "
@@ -321,6 +262,13 @@ type Filter_Condition
             [name, code]
         make_single_choice options
 
+## Specifies the action of a Filter_Condition.
+type Filter_Action
+    ## Items matching the filter are kept.
+    Keep
+
+    ## Items matching the filter are removed.
+    Remove
 
 ## PRIVATE
 sql_like_to_regex sql_pattern =

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Java_Json.enso

@@ -22,14 +22,19 @@ from project.Metadata.Widget import Single_Choice
 
 polyglot java import com.fasterxml.jackson.core.JsonProcessingException
 polyglot java import com.fasterxml.jackson.databind.JsonNode
-polyglot java import com.fasterxml.jackson.databind.ObjectMapper
 polyglot java import com.fasterxml.jackson.databind.node.ArrayNode
 polyglot java import com.fasterxml.jackson.databind.node.JsonNodeType
 polyglot java import com.fasterxml.jackson.databind.node.ObjectNode
+polyglot java import com.fasterxml.jackson.databind.ObjectMapper
 
 ## PRIVATE
    Jackson-based JSON Parser
 type Java_Json
+    ## ALIAS from text
+       GROUP Conversions
+
+       Parse a Text value into a `Jackson_Object` or an Enso primitive value
+       (like `Text`, `Number`, `Boolean`, `Nothing`), or a `Vector` of values.
     parse : Text -> Nothing | Boolean | Number | Text | Vector | Jackson_Object
     parse text:Text =
         error_handler js_exception =
@@ -60,6 +65,8 @@ read_json_array node =
 
 ## PRIVATE
 type Jackson_Object
+    ## PRIVATE
+       Creates a new `Jackson_Object` from an `ObjectNode`.
     new : ObjectNode -> Jackson_Object
     new object_node =
         make_field_names object =

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Json.enso

@@ -279,7 +279,7 @@ type JS_Object
              obj.set_value "foo" "asdf"
              # => {"foo":"asdf","baz":"quux"}
     set_value : Text -> Any -> JS_Object
-    set_value self:JS_Object key:Text value = JS_Object.Value (set_value self.js_object key value.to_js_object)
+    set_value self key:Text value = JS_Object.Value (set_value self.js_object key value.to_js_object)
 
 ## PRIVATE
 type JS_Object_Comparator

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Locale.enso

@@ -1,4 +1,5 @@
 import project.Any.Any
+import project.Data.Filter_Condition.Filter_Action
 import project.Data.Filter_Condition.Filter_Condition
 import project.Data.Text.Case.Case
 import project.Data.Text.Text
@@ -438,7 +439,7 @@ type Locale
     predefined_locale_fields =
         locale_meta = Meta.meta Locale
         remove_us = locale_meta.methods + ["Value", "new", "default", "from_language_tag", "from_java", "predefined_locale_fields", "default_widget", "widget_options"]
-        Meta.Type.Value (Meta.type_of locale_meta.value) . methods . filter (Filter_Condition.Not_In remove_us) . sort
+        Meta.Type.Value (Meta.type_of locale_meta.value) . methods . filter (Filter_Condition.Is_In remove_us Filter_Action.Remove) . sort
 
     ## PRIVATE
     widget_options : Vector Option

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Numbers.enso

@@ -8,11 +8,10 @@ import project.Errors.Common.Incomparable_Values
 import project.Errors.Common.Unsupported_Argument_Types
 import project.Errors.Illegal_Argument.Illegal_Argument
 import project.Function.Function
+import project.Internal.Rounding_Helpers
 import project.Nothing.Nothing
 import project.Panic.Panic
 from project.Data.Boolean import Boolean, False, True
-
-import project.Internal.Rounding_Helpers
 from project.Internal.Number_Builtins import all
 
 polyglot java import java.lang.Double

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Range.enso

@@ -184,12 +184,11 @@ type Range
              (0.up_to 7).filter (Filter_Condition.Greater than=3)
     @filter range_default_filter_condition_widget
     filter : (Filter_Condition | (Integer -> Boolean)) -> Vector Integer
-    filter self filter = case filter of
+    filter self filter =
-        _ : Filter_Condition -> self.filter filter.to_predicate
+        predicate = unify_condition_or_predicate filter
-        predicate : Function ->
+        builder = self.fold Vector.new_builder builder-> elem->
-            builder = self.fold Vector.new_builder builder-> elem->
+            if predicate elem then builder.append elem else builder
-                if predicate elem then builder.append elem else builder
+        builder.to_vector
-            builder.to_vector
 
     ## GROUP Selections
        Partitions the range into `Vector`s of elements which satisfy a given

distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Time.enso

@@ -308,7 +308,7 @@ type Date_Time
              from Standard.Base import Date_Time
 
              example_from_unix_epoch = Date_Time.from_unix_epoch_milliseconds 1601587200000
-    from_unix_epoch_milliseconds : Integer -> Time_Zone -> Date_Time
+    from_unix_epoch_milliseconds : Integer -> Date_Time
     from_unix_epoch_milliseconds milliseconds:Integer =
         unix_epoch_start + Duration.new milliseconds=milliseconds
 

distribution/lib/Standard/Base/0.0.0-dev/src/Errors/File_Error.enso

@@ -5,8 +5,8 @@ import project.Meta
 import project.Nothing.Nothing
 import project.Panic.Panic
 import project.System.File.File
-import project.System.File_Format_Metadata.File_Format_Metadata
 import project.System.File_Format.File_Format
+import project.System.File_Format_Metadata.File_Format_Metadata
 
 polyglot java import java.io.FileNotFoundException
 polyglot java import java.io.IOException

distribution/lib/Standard/Base/0.0.0-dev/src/Main.enso

@@ -5,6 +5,7 @@ import project.Data.Boolean
 import project.Data.Enso_Cloud.Enso_File.Enso_File
 import project.Data.Enso_Cloud.Enso_Secret.Enso_Secret
 import project.Data.Enso_Cloud.Enso_User.Enso_User
+import project.Data.Filter_Condition.Filter_Action
 import project.Data.Filter_Condition.Filter_Condition
 import project.Data.Index_Sub_Range.Index_Sub_Range
 import project.Data.Interval.Bound
@@ -102,6 +103,7 @@ export project.Data.Array.Array
 export project.Data.Enso_Cloud.Enso_File.Enso_File
 export project.Data.Enso_Cloud.Enso_Secret.Enso_Secret
 export project.Data.Enso_Cloud.Enso_User.Enso_User
+export project.Data.Filter_Condition.Filter_Action
 export project.Data.Filter_Condition.Filter_Condition
 export project.Data.Index_Sub_Range.Index_Sub_Range
 export project.Data.Interval.Bound

distribution/lib/Standard/Base/0.0.0-dev/src/Network/HTTP/Header.enso

@@ -1,13 +1,13 @@
-import project.Data.Enso_Cloud.Enso_Secret.Enso_Secret
 import project.Data.Enso_Cloud.Enso_Secret.Derived_Secret_Value
+import project.Data.Enso_Cloud.Enso_Secret.Enso_Secret
 import project.Data.Enso_Cloud.Utils as Cloud_Utils
 import project.Data.Numbers.Integer
 import project.Data.Text.Encoding.Encoding
 import project.Data.Text.Text
 import project.Nothing.Nothing
 from project.Data.Boolean import Boolean, False, True
-from project.Data.Ordering import all
 from project.Data.Enso_Cloud.Enso_Secret import as_hideable_value
+from project.Data.Ordering import all
 from project.Data.Text.Extensions import all
 
 polyglot java import org.graalvm.collections.Pair as Java_Pair
@@ -22,7 +22,7 @@ type Header
        - value: The header value.
     Value name:Text value:(Text|Enso_Secret|Derived_Secret_Value)
 
-    ## ALIAS Build a Header
+    ## ALIAS build a header
 
        Create a new Header.
 
@@ -36,7 +36,7 @@ type Header
              import Standard.Base.Network.HTTP.Header.Header
 
              example_new = Header.new "My_Header" "my header's value"
-    new : Text -> Text | Enso_Secret -> Header
+    new : Text -> Text | Enso_Secret | Derived_Secret_Value -> Header
     new name:Text value:(Text | Enso_Secret | Derived_Secret_Value) = Header.Value name value
 
     ## Create an "Accept" header.
@@ -64,7 +64,7 @@ type Header
     accept_all : Header
     accept_all = Header.accept "*/*"
 
-    ## ALIAS Build an Auth Header
+    ## ALIAS build an auth header
 
        Create an "Authorization" header.
 
@@ -102,7 +102,7 @@ type Header
 
        Arguments:
        - token: The token.
-    authorization_bearer : Text -> Header
+    authorization_bearer : Text | Enso_Secret | Derived_Secret_Value -> Header
     authorization_bearer (token : Text | Enso_Secret | Derived_Secret_Value) =
         value = ((Derived_Secret_Value.from "Bearer ") + (Derived_Secret_Value.from token))
         Header.authorization value.simplify

distribution/lib/Standard/Base/0.0.0-dev/src/Network/HTTP/Response.enso

@@ -134,7 +134,7 @@ type Response
          inferred from response headers. If that fails, UTF-8 is used as the
          fallback.
     @encoding Encoding.default_widget
-    decode_as_text : Encoding|Infer -> Text
+    decode_as_text : Encoding | Infer -> Text
     decode_as_text self (encoding : Encoding | Infer = Infer) =
         self.body.decode_as_text encoding
 
@@ -154,7 +154,7 @@ type Response
 
              example_to_text = Examples.get_geo_data.decode_as_json
     @encoding Encoding.default_widget
-    decode_as_json : Encoding|Infer -> JS_Object | Boolean | Number | Nothing | Text | Vector
+    decode_as_json : Encoding | Infer -> JS_Object | Boolean | Number | Nothing | Text | Vector
     decode_as_json self (encoding : Encoding | Infer = Infer) =
         self.body.decode_as_json encoding
 

distribution/lib/Standard/Base/0.0.0-dev/src/Network/HTTP/Response_Body.enso

@@ -49,7 +49,7 @@ type Response_Body
        - stream: The body of the response as an InputStream.
        - metadata: File format metadata associated with the response.
        - uri: The URI of the response.
-    new : InputStream -> Text -> URI -> Response_Body
+    new : InputStream -> File_Format_Metadata -> URI -> Response_Body
     new stream (metadata : File_Format_Metadata) (uri : URI) =
         input_stream = Input_Stream.new stream (HTTP_Error.handle_java_exceptions uri)
         Response_Body.Raw_Stream input_stream metadata uri
@@ -142,7 +142,7 @@ type Response_Body
          inferred from response headers. If that fails, UTF-8 is used as the
          fallback.
     @encoding Encoding.default_widget
-    decode_as_text : Encoding|Infer -> Text
+    decode_as_text : Encoding | Infer -> Text
     decode_as_text self (encoding : Encoding | Infer = Infer) = self.decode (Plain_Text_Format.Plain_Text encoding)
 
     ## ALIAS parse as json, parse json
@@ -161,7 +161,7 @@ type Response_Body
 
              example_to_text = Examples.get_geo_data.decode_as_json
     @encoding Encoding.default_widget
-    decode_as_json : Encoding|Infer -> JS_Object | Boolean | Number | Nothing | Text | Vector
+    decode_as_json : Encoding | Infer -> JS_Object | Boolean | Number | Nothing | Text | Vector
     decode_as_json self (encoding : Encoding | Infer = Infer) =
         self.decode_as_text encoding . parse_json
 

distribution/lib/Standard/Base/0.0.0-dev/src/Random.enso

@@ -155,7 +155,7 @@ type Random
              import Standard.Base.Random.Random
 
              d = Random.date (Date.new 2023 03 01) (Date.new 2023 10 15)
-    date : Date -> Date -> Boolean -> Date
+    date : Date -> Date -> Date
     date min:Date max:Date = Random_Generator.global_random_generator.date min max
 
     ## GROUP Random
@@ -297,7 +297,7 @@ type Random_Generator
         Vector.from_polyglot_array array
 
     ## PRIVATE
-    date : Date -> Date -> Boolean -> Date
+    date : Date -> Date -> Date
     date self start_date:Date end_date:Date =
         date_range = start_date.up_to end_date include_end=True
         date_range.at (self.integer 0 (date_range.length - 1))

distribution/lib/Standard/Base/0.0.0-dev/src/System/File_By_Line.enso

@@ -14,11 +14,11 @@ from project.Data.Range.Extensions import all
 from project.Data.Text.Extensions import all
 from project.Logging import all
 
+polyglot java import java.io.File as Java_File
+polyglot java import java.nio.charset.Charset
 polyglot java import org.enso.base.Array_Utils
 polyglot java import org.enso.base.arrays.LongArrayList
 polyglot java import org.enso.base.FileLineReader
-polyglot java import java.io.File as Java_File
-polyglot java import java.nio.charset.Charset
 
 type File_By_Line
     ## Creates a new File_By_Line object.
@@ -27,7 +27,7 @@ type File_By_Line
        - file: The file to read.
        - encoding: The encoding to use when reading the file (defaults to UTF 8).
        - offset: The position within the file to read from (defaults to first byte).
-    new : File->Encoding->File_By_Line
+    new : File -> Encoding -> Integer -> File_By_Line
     new file:File encoding:Encoding=Encoding.utf_8 offset:Integer=0 =
         create_row_map =
             row_map = LongArrayList.new
@@ -52,7 +52,7 @@ type File_By_Line
 
        Arguments
        - line: The line to read (0 indexed).
-    get : Integer->Text
+    get : Integer -> Text
     get self line:Integer = if self.limit_lines.is_nothing.not && line>self.limit_lines then Error.throw (Index_Out_Of_Bounds.Error line self.limit_lines) else
         read_line self line
 
@@ -201,13 +201,13 @@ type File_By_Line
 
 ## PRIVATE
    Reads a specific line from the file.
-read_line : File_By_Line->Integer->Any->Any
+read_line : File_By_Line -> Integer -> Any -> Any
 read_line file:File_By_Line line:Integer=0 ~default=Nothing = File_Error.handle_java_exceptions file.file <|
     FileLineReader.readSingleLine file.java_file file.file_end file.row_map line file.charset file.filter_func . if_nothing default
 
 ## PRIVATE
    Performs an action on each line in the file.
-for_each_lines : File_By_Line->Integer->(Integer|Nothing)->Any->Any
+for_each_lines : File_By_Line -> Integer -> (Integer|Nothing) -> Any -> Any
 for_each_lines file:File_By_Line start_at:Integer end_at:(Integer|Nothing) action = File_Error.handle_java_exceptions file.file <|
     java_file = file.java_file
     row_map = file.row_map

distribution/lib/Standard/Base/0.0.0-dev/src/Widget_Helpers.enso

@@ -19,8 +19,8 @@ make_delimiter_selector : Widget
 make_delimiter_selector =
     make_single_choice [',', ';', '|', ['{tab}', "'\t'"], ['{space}', "' '"], ['{newline}', "['\n', '\r\n', '\r']"], '_', ['Custom', "'?'"]]
 
- ## PRIVATE
+## PRIVATE
-      Creates a Single_Choice Widget for file read delimiters.
+   Creates a Single_Choice Widget for file read delimiters.
 make_file_read_delimiter_selector : Widget
 make_file_read_delimiter_selector =
         make_single_choice [',', ';', '|', ['{tab}', "'\t'"], ['{space}', "' '"], ['{none}', "''"], '_', ['Custom', "'?'"]]

distribution/lib/Standard/Database/0.0.0-dev/src/Connection/Connection.enso

@@ -180,7 +180,7 @@ type Connection
             True -> result
             False ->
                 hidden_tables = self.hidden_table_registry.list_hidden_tables
-                result.filter "Name" (Filter_Condition.Not_In hidden_tables)
+                result.filter "Name" (Filter_Condition.Is_In hidden_tables Filter_Action.Remove)
 
     ## PRIVATE
        Checks if the table with the given name exists in the database.

distribution/lib/Standard/Database/0.0.0-dev/src/Data/Column.enso

@@ -147,7 +147,7 @@ type Column
              import Standard.Examples
 
              example_at = Examples.integer_column.get 0 -1
-    get : Integer -> (Any | Nothing)
+    get : Integer -> Any -> Any | Nothing
     get self (index : Integer) (~default=Nothing) =
         self.read index+1 . get index default
 

distribution/lib/Standard/Table/0.0.0-dev/src/Data/Column.enso

@@ -32,9 +32,9 @@ from project.Internal.Column_Format import all
 from project.Internal.Java_Exports import make_date_builder_adapter, make_string_builder
 
 polyglot java import org.enso.base.Time_Utils
-polyglot java import org.enso.table.data.mask.OrderMask
 polyglot java import org.enso.table.data.column.operation.cast.CastProblemAggregator
 polyglot java import org.enso.table.data.column.storage.Storage as Java_Storage
+polyglot java import org.enso.table.data.mask.OrderMask
 polyglot java import org.enso.table.data.table.Column as Java_Column
 polyglot java import org.enso.table.error.ValueTypeMismatchException
 polyglot java import org.enso.table.operations.OrderBuilder
@@ -1063,7 +1063,11 @@ type Column
     internal_is_empty : Column
     internal_is_empty self =
         new_name = naming_helper.concat [naming_helper.to_expression_text self, "is empty"]
-        run_vectorized_unary_op self Java_Storage.Maps.IS_EMPTY new_name fallback_fn=Filter_Condition.Is_Empty.to_predicate expected_result_type=Value_Type.Boolean skip_nulls=False
+        fallback x = case x of
+            _ : Text -> x == ""
+            Nothing  -> True
+            _        -> False
+        run_vectorized_unary_op self Java_Storage.Maps.IS_EMPTY new_name fallback_fn=fallback expected_result_type=Value_Type.Boolean skip_nulls=False
 
     ## GROUP Standard.Base.Logical
        Returns a column of booleans, with `True` items at the positions where
@@ -2072,7 +2076,7 @@ type Column
              import Standard.Examples
 
              example_at = Examples.integer_column.get 0 -1
-    get : Integer -> (Any | Nothing)
+    get : Integer -> Any -> Any | Nothing
     get self (index : Integer) (~default=Nothing) =
         valid_index = (index >= 0) && (index < self.length)
         if valid_index.not then default else

distribution/lib/Standard/Table/0.0.0-dev/src/Data/Column_Ref.enso

@@ -7,3 +7,6 @@ type Column_Ref
 
     ## Reference to a column by index in a table.
     Index index:Integer
+
+    ## Representation of an expression derived in a table.
+    Expression expression:Text

distribution/lib/Standard/Table/0.0.0-dev/src/Data/Conversions/Convertible_To_Columns.enso

@@ -1,6 +1,6 @@
 from Standard.Base import all
-import Standard.Base.Errors.Illegal_Argument.Illegal_Argument
 import Standard.Base.Data.Java_Json.Jackson_Object
+import Standard.Base.Errors.Illegal_Argument.Illegal_Argument
 
 ## PRIVATE
    A special type describing how to convert an object into a set of table

distribution/lib/Standard/Table/0.0.0-dev/src/Delimited/Delimited_Format.enso

@@ -140,8 +140,8 @@ type Delimited_Format
         self.clone value_formatter=Nothing
 
     ## Creates a clone of this with a changed line ending style.
-    with_line_endings : Line_Ending_Style|Infer -> Delimited_Format
+    with_line_endings : Line_Ending_Style | Infer -> Delimited_Format
-    with_line_endings self (line_endings : Line_Ending_Style | Infer)=Infer =
+    with_line_endings self (line_endings : Line_Ending_Style | Infer = Infer) =
         self.clone line_endings=line_endings
 
     ## Creates a clone of this with comment parsing enabled.

distribution/lib/Standard/Table/0.0.0-dev/src/Excel/Excel_Workbook.enso

@@ -34,7 +34,7 @@ type Excel_Workbook
        - xls_format: Whether to use the old XLS format (default is XLSX).
        - headers: Whether to use the first row as headers (default is to infer).
     new : File | Temporary_File -> Boolean -> Boolean | Infer -> Excel_Workbook
-    new file:(File|Temporary_File) xls_format=False headers=Infer =
+    new file:(File | Temporary_File) xls_format=False headers=Infer =
         file_for_errors = if file.is_a Temporary_File then Nothing else file
 
         continuation raw_file =

distribution/lib/Standard/Table/0.0.0-dev/src/Extensions/Table_Ref.enso

@@ -7,7 +7,7 @@ import project.Data.Column_Ref.Column_Ref
 import project.Data.Expression.Expression_Error
 import project.Data.Set_Mode.Set_Mode
 import project.Data.Table.Table
-from project.Errors import Existing_Column, Missing_Column, No_Such_Column
+from project.Errors import Existing_Column, Invalid_Value_Type, Missing_Column, No_Such_Column
 
 ## PRIVATE
    A helper type allowing to resolve column references in a context of an underlying table.
@@ -23,12 +23,24 @@ type Table_Ref
     at : Text | Integer -> Any ! No_Such_Column | Index_Out_Of_Bounds
     at self selector=0 = self.underlying.at selector
 
+    ## PRIVATE
+       Given an expression, create a derived column where each value is the
+       result of evaluating the expression for the row.
+
+       Arguments:
+       - expression: The expression to evaluate.
+       - on_problems: Specifies how to handle non-fatal problems, attaching a
+         warning by default.
+    evaluate_expression : Text -> Problem_Behavior -> Any ! No_Such_Column | Invalid_Value_Type | Expression_Error
+    evaluate_expression self expression on_problems=Report_Warning = self.underlying.evaluate_expression expression on_problems=on_problems
+
     ## PRIVATE
        Resolve a Column_Ref to a Column, keeping any other values as-is.
     resolve : Any -> Any ! No_Such_Column | Index_Out_Of_Bounds
     resolve self value = case value of
         Column_Ref.Name name -> self.at name
         Column_Ref.Index index -> self.at index
+        Column_Ref.Expression expression -> self.evaluate_expression expression
         _ -> value
 
     ## PRIVATE
@@ -38,28 +50,26 @@ type Table_Ref
     resolve_as_column self value = case value of
         Column_Ref.Name name -> self.at name
         Column_Ref.Index index -> self.at index
+        Column_Ref.Expression expression -> self.evaluate_expression expression
         _ -> self.underlying.make_constant_column value
 
     ## PRIVATE
        Transforms a condition, changing any Column_Ref instances into Column instances resolved in this table.
     resolve_condition : Filter_Condition -> Filter_Condition
     resolve_condition self condition = case condition of
-        Filter_Condition.Equal value -> Filter_Condition.Equal (self.resolve value)
+        Filter_Condition.Equal value action -> Filter_Condition.Equal (self.resolve value) action
-        Filter_Condition.Not_Equal value -> Filter_Condition.Not_Equal (self.resolve value)
+        Filter_Condition.Not_Equal value action -> Filter_Condition.Not_Equal (self.resolve value) action
-        Filter_Condition.Less value -> Filter_Condition.Less (self.resolve value)
+        Filter_Condition.Less value action -> Filter_Condition.Less (self.resolve value) action
-        Filter_Condition.Equal_Or_Less value -> Filter_Condition.Equal_Or_Less (self.resolve value)
+        Filter_Condition.Equal_Or_Less value action -> Filter_Condition.Equal_Or_Less (self.resolve value) action
-        Filter_Condition.Greater value -> Filter_Condition.Greater (self.resolve value)
+        Filter_Condition.Greater value action -> Filter_Condition.Greater (self.resolve value) action
-        Filter_Condition.Equal_Or_Greater value -> Filter_Condition.Equal_Or_Greater (self.resolve value)
+        Filter_Condition.Equal_Or_Greater value action -> Filter_Condition.Equal_Or_Greater (self.resolve value) action
-        Filter_Condition.Between lower upper -> Filter_Condition.Between (self.resolve lower) (self.resolve upper)
+        Filter_Condition.Between lower upper action -> Filter_Condition.Between (self.resolve lower) (self.resolve upper) action
-        Filter_Condition.Equal_Ignore_Case value locale -> Filter_Condition.Equal_Ignore_Case (self.resolve value) locale
+        Filter_Condition.Equal_Ignore_Case value locale action -> Filter_Condition.Equal_Ignore_Case (self.resolve value) locale action
-        Filter_Condition.Starts_With prefix case_sensitivity -> Filter_Condition.Starts_With (self.resolve prefix) case_sensitivity
+        Filter_Condition.Starts_With prefix case_sensitivity action -> Filter_Condition.Starts_With (self.resolve prefix) case_sensitivity action
-        Filter_Condition.Ends_With prefix case_sensitivity -> Filter_Condition.Ends_With (self.resolve prefix) case_sensitivity
+        Filter_Condition.Ends_With prefix case_sensitivity action -> Filter_Condition.Ends_With (self.resolve prefix) case_sensitivity action
-        Filter_Condition.Contains prefix case_sensitivity -> Filter_Condition.Contains (self.resolve prefix) case_sensitivity
+        Filter_Condition.Contains prefix case_sensitivity action -> Filter_Condition.Contains (self.resolve prefix) case_sensitivity action
-        Filter_Condition.Not_Contains prefix case_sensitivity -> Filter_Condition.Not_Contains (self.resolve prefix) case_sensitivity
+        Filter_Condition.Like pattern action -> Filter_Condition.Like (self.resolve pattern) action
-        Filter_Condition.Like pattern -> Filter_Condition.Like (self.resolve pattern)
+        Filter_Condition.Is_In values action -> Filter_Condition.Is_In (check_is_in_values "Is_In" values) action
-        Filter_Condition.Not_Like pattern -> Filter_Condition.Not_Like (self.resolve pattern)
-        Filter_Condition.Is_In values -> Filter_Condition.Is_In (check_is_in_values "Is_In" values)
-        Filter_Condition.Not_In values -> Filter_Condition.Not_In (check_is_in_values "Not_In" values)
         _ -> condition
 
     ## PRIVATE

distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Expand_Objects_Helpers.enso

@@ -78,7 +78,7 @@ expand_column (table : Table) (column : Text | Integer) (fields : (Vector Text)
      # => Table.new [["aaa", [1, 1, 2, 2]], ["bbb", [30, 31, 40, 41]]]
 @column Widget_Helpers.make_column_name_selector
 expand_to_rows : Table -> Text | Integer -> Boolean -> Table ! Type_Error | No_Such_Column | Index_Out_Of_Bounds
-expand_to_rows table column:(Text|Integer) at_least_one_row=False = if column.is_a Integer then expand_to_rows table (table.at column).name at_least_one_row else
+expand_to_rows table column:(Text | Integer) at_least_one_row=False = if column.is_a Integer then expand_to_rows table (table.at column).name at_least_one_row else
     row_expander : Any -> Vector
     row_expander value:Convertible_To_Rows = value.to_vector
 

distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Filter_Condition_Helpers.enso

@@ -13,80 +13,73 @@ from project.Errors import Nothing_Value_In_Filter_Condition
 
    It also performs validation and will throw errors if unexpected column types
    are encountered.
-make_filter_column source_column filter_condition on_problems = case filter_condition of
+make_filter_column source_column filter_condition on_problems =
-    # Equality
+    base_column = case filter_condition of
-    Equal value ->
+        # Equality
-        warn_on_nothing_in_comparison filter_condition value <|
+        Equal value _ ->
-            Warning.with_suspended source_column source_column->
+            warn_on_nothing_in_comparison filter_condition value <|
-                Warning.with_suspended value value->
+                Warning.with_suspended source_column source_column->
-                    on_problems.escalate_warnings <|
+                    Warning.with_suspended value value->
-                        source_column == value
+                        on_problems.escalate_warnings <|
-    Not_Equal value ->
+                            source_column == value
-        warn_on_nothing_in_comparison filter_condition value <|
+        Not_Equal value _ ->
-            Warning.with_suspended source_column source_column->
+            warn_on_nothing_in_comparison filter_condition value <|
-                Warning.with_suspended value value->
+                Warning.with_suspended source_column source_column->
-                    on_problems.escalate_warnings <|
+                    Warning.with_suspended value value->
-                        source_column != value
+                        on_problems.escalate_warnings <|
-    # Nothing
+                            source_column != value
-    Is_Nothing -> source_column.is_nothing
+        # Nothing
-    Not_Nothing -> source_column.is_nothing.not
+        Is_Nothing _ -> source_column.is_nothing
-    # Boolean
+        Not_Nothing _ -> source_column.is_nothing.not
-    Is_True ->
+        # Boolean
-        Value_Type.expect_boolean source_column <| source_column
+        Is_True _ -> Value_Type.expect_boolean source_column <| source_column
-    Is_False -> source_column.not
+        Is_False _ -> Value_Type.expect_boolean source_column <| source_column.not
-    # Comparisons
+        # Comparisons
-    Less value ->
+        Less value _ ->
-        warn_on_nothing_in_comparison filter_condition value <|
+            warn_on_nothing_in_comparison filter_condition value <|
-            source_column < value
+                source_column < value
-    Equal_Or_Less value ->
+        Equal_Or_Less value _ ->
-        warn_on_nothing_in_comparison filter_condition value <|
+            warn_on_nothing_in_comparison filter_condition value <|
-            source_column <= value
+                source_column <= value
-    Equal_Or_Greater value ->
+        Equal_Or_Greater value _ ->
-        warn_on_nothing_in_comparison filter_condition value <|
+            warn_on_nothing_in_comparison filter_condition value <|
-            source_column >= value
+                source_column >= value
-    Greater value ->
+        Greater value _ ->
-        warn_on_nothing_in_comparison filter_condition value <|
+            warn_on_nothing_in_comparison filter_condition value <|
-            source_column > value
+                source_column > value
-    Between lower upper ->
+        Between lower upper _ ->
-        warn_on_nothing_in_comparison filter_condition lower <|
+            warn_on_nothing_in_comparison filter_condition lower <|
-            warn_on_nothing_in_comparison filter_condition upper <|
+                warn_on_nothing_in_comparison filter_condition upper <|
-                source_column.between lower upper
+                    source_column.between lower upper
-    # Text
+        # Text
-    Equal_Ignore_Case value locale ->
+        Equal_Ignore_Case value locale _ ->
-        source_column.equals_ignore_case value locale
+            source_column.equals_ignore_case value locale
-    Starts_With prefix case_sensitivity ->
+        Starts_With prefix case_sensitivity _ ->
-        source_column.starts_with prefix case_sensitivity
+            source_column.starts_with prefix case_sensitivity
-    Ends_With suffix case_sensitivity ->
+        Ends_With suffix case_sensitivity _ ->
-        source_column.ends_with suffix case_sensitivity
+            source_column.ends_with suffix case_sensitivity
-    Contains substring case_sensitivity ->
+        Contains substring case_sensitivity _ ->
-        source_column.contains substring case_sensitivity
+            source_column.contains substring case_sensitivity
-    Not_Contains substring case_sensitivity ->
+        Is_Empty _ -> source_column.is_empty
-        source_column.contains substring case_sensitivity . not
+        Not_Empty _ -> source_column.is_empty.not
-    Is_Empty ->
+        Like pattern _ -> source_column.like pattern
-        source_column.is_empty
+        # Numeric
-    Not_Empty ->
+        Is_Nan _ -> source_column.is_nan
-        source_column.is_empty.not
+        Is_Infinite _ -> source_column.is_infinite
-    Like pattern ->
+        Is_Finite _ ->
-        source_column.like pattern
+            is_infinite_column = source_column.is_infinite
-    Not_Like pattern ->
+            is_nan_column = source_column.is_nan
-        source_column.like pattern . not
+            ## We check is_nan_column for error, since some Database backends may
-    # Numeric
+               actually not support it and throw Unsupported_Database_Operation here.
-    Is_Nan -> source_column.is_nan
+            if is_nan_column.is_error then is_infinite_column.not else
-    Is_Infinite -> source_column.is_infinite
+                (is_infinite_column || is_nan_column).not
-    Is_Finite ->
+        # Vector
-        is_infinite_column = source_column.is_infinite
+        Is_In values _ ->
-        is_nan_column = source_column.is_nan
+            warn_on_nothing_in_comparison_vector filter_condition values <|
-        ## We check is_nan_column for error, since some Database backends may
+                source_column.is_in values
-           actually not support it and throw Unsupported_Database_Operation here.
+    if filter_condition.action == Filter_Action.Keep then base_column else
-        if is_nan_column.is_error then is_infinite_column.not else
+        ## We need to fill in the Nothing values and then negate the result.
-            (is_infinite_column || is_nan_column).not
+        (base_column.fill_nothing False).not
-    # Vector
-    Is_In values ->
-        warn_on_nothing_in_comparison_vector filter_condition values <|
-            source_column.is_in values
-    Not_In values ->
-        warn_on_nothing_in_comparison_vector filter_condition values <|
-            source_column.is_in values . not
 
 ## Attach a warning if the provided value is `Nothing`.
 warn_on_nothing_in_comparison : Filter_Condition -> Any -> Any -> Any

distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Split_Tokenize.enso

@@ -17,7 +17,7 @@ split_to_columns table input_column_id delimiter="," column_count=Nothing on_pro
    Splits a column of text into a set of new rows.
    See `Table.split_to_rows`.
 split_to_rows : Table -> Text | Integer -> Text -> Table
-split_to_rows table input_column_id:(Text|Integer) delimiter="," =
+split_to_rows table input_column_id:(Text | Integer) delimiter="," =
     column = table.at input_column_id
     Value_Type.expect_text column <|
         fan_out_to_rows table column.name (handle_nothing (_.split delimiter)) at_least_one_row=True

distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Widget_Helpers.enso

@@ -85,7 +85,8 @@ make_column_name_vector_selector table display=Display.Always =
 make_column_ref_by_name_selector : Table -> Display -> Widget
 make_column_ref_by_name_selector table display=Display.Always =
     col_names_options = table.column_names.map (name -> Option name "(Column_Ref.Name "+name.pretty+")")
-    Single_Choice values=col_names_options display=display
+    expression_option = Option "<Expression>" "(Column_Ref.Expression '["+table.column_names.first+"]')"
+    Single_Choice values=(col_names_options+[expression_option]) display=display
 
 ## PRIVATE
    Same as `make_column_ref_by_name_selector` but also highlights an option for
@@ -94,7 +95,8 @@ make_column_ref_or_text_value_selector : Table -> Display -> Widget
 make_column_ref_or_text_value_selector table display=Display.Always =
     col_names_options = table.column_names.map (name -> Option name "(Column_Ref.Name "+name.pretty+")")
     custom_text_option = Option "'custom text'" "''"
-    Single_Choice values=(col_names_options+[custom_text_option]) display=display
+    expression_option = Option "<Expression>" "(Column_Ref.Expression '["+table.column_names.first+"]')"
+    Single_Choice values=(col_names_options+[custom_text_option, expression_option]) display=display
 
 ## PRIVATE
    If `column_source` is Nothing, `Column_Ref` options will not be added.
@@ -104,7 +106,9 @@ make_fill_default_value_selector column_source=Nothing include_custom_text=False
         column_source.column_names.map (name -> Option name "(Column_Ref.Name "+name.pretty+")")
     custom_text_option = if include_custom_text then [Option "'custom text'" "''"] else []
     previous_value_option = [Option 'Previous Value' 'Previous_Value']
-    Single_Choice values=(previous_value_option+col_names_options+custom_text_option) display=display
+    default_column = if column_source.is_nothing then '""' else column_source.name.pretty
+    expression_option = Option "<Expression>" '(Column_Ref.Expression \''+default_column+'\')'
+    Single_Choice values=(previous_value_option+col_names_options+custom_text_option+expression_option) display=display
 
 ## PRIVATE
    Make a filter condition selector.
@@ -124,7 +128,6 @@ make_filter_condition_selector table display=Display.Always =
     builder.append (Option "Starts With" fqn+".Starts_With" [["prefix", col_names]])
     builder.append (Option "Ends With" fqn+".Ends_With" [["suffix", col_names]])
     builder.append (Option "Contains" fqn+".Contains" [["substring", col_names]])
-    builder.append (Option "Not Contains" fqn+".Not_Contains" [["substring", col_names]])
     builder.append (Option "Is Nothing" fqn+".Is_Nothing")
     builder.append (Option "Is Not Nothing" fqn+".Not_Nothing")
     builder.append (Option "Is Finite" fqn+".Is_Finite")
@@ -135,9 +138,7 @@ make_filter_condition_selector table display=Display.Always =
     builder.append (Option "Is Empty" fqn+".Is_Empty")
     builder.append (Option "Is Not Empty" fqn+".Not_Empty")
     builder.append (Option "Like" fqn+".Like" [["pattern", col_names]])
-    builder.append (Option "Not Like" fqn+".Not_Like" [["pattern", col_names]])
     builder.append (Option "Is In" fqn+".Is_In")
-    builder.append (Option "Not In" fqn+".Not_In")
     Single_Choice builder.to_vector display=display
 
 ## PRIVATE

distribution/lib/Standard/Test_New/0.0.0-dev/src/Helpers.enso

@@ -5,13 +5,13 @@ from Standard.Base.Runtime import State
 
 import project.Clue.Clue
 import project.Group.Group
-import project.Spec_Result.Spec_Result
 import project.Spec.Spec
+import project.Spec_Result.Spec_Result
 import project.Suite.Suite
 import project.Suite_Config.Suite_Config
-import project.Test_Result.Test_Result
-import project.Test_Reporter
 import project.Test.Test
+import project.Test_Reporter
+import project.Test_Result.Test_Result
 
 run_group_with_filter : Group -> (Regex|Text|Nothing) -> Vector Test_Result
 run_group_with_filter (group : Group) (spec_filter : (Regex|Text|Nothing)) =
@@ -28,7 +28,7 @@ run_group (group : Group) =
     run_specs_from_group group.specs group
 
 
-run_specs_from_group : Vector Spec -> Text -> Vector Test_Result
+run_specs_from_group : Vector Spec -> Group -> Vector Test_Result
 run_specs_from_group (specs : Vector Spec) (group : Group) =
     case specs.is_empty of
         True -> []

distribution/lib/Standard/Test_New/0.0.0-dev/src/Main.enso

@@ -1,9 +1,10 @@
+import project.Problems
 import project.Suite.Suite
 import project.Test.Test
-import project.Problems
 from project.Extensions import all
 
+export project.Problems
 export project.Suite.Suite
 export project.Test.Test
-export project.Problems
 from project.Extensions export all
+

distribution/lib/Standard/Test_New/0.0.0-dev/src/Suite.enso

@@ -28,7 +28,7 @@ type Suite_Builder
          `specify` method on group builder. See its docs.
        - pending: Contains a reason for why the test group should be ignored. If Nothing, the test
          is not ignored.
-    group : Text -> (Group_Builder -> Any) -> Nothing
+    group : Text -> (Group_Builder -> Any) -> (Text | Nothing) -> Nothing
     group self (name:Text) (fn : (Group_Builder -> Any)) (pending : (Text | Nothing) = Nothing) =
         group_builder = Group_Builder.Impl
         case pending of
@@ -62,7 +62,7 @@ type Suite
        - group_filter: Filter for group names.
        - spec_filter: Filter for spec names.
        - should_exit: If true, executes `System.exit` at the end.
-    run_with_filter : (Regex | Text | Nothing) -> (Regex | Text | Nothing) -> Nothing
+    run_with_filter : (Regex | Text | Nothing) -> (Regex | Text | Nothing) -> Boolean -> Nothing
     run_with_filter self group_filter=Nothing spec_filter=Nothing should_exit=True =
         config = Suite_Config.from_environment
 
@@ -99,9 +99,11 @@ type Suite
             False ->
                 failed_tests == 0
 
+    ## Gets the names of all the groups in this suite.
     group_names self =
         self.groups.map (_.name)
 
+    ## Print the structure of the suite to the console.
     print_all self =
         IO.println "Test Suite:"
         self.groups.each group->

distribution/lib/Standard/Test_New/0.0.0-dev/src/Test.enso

@@ -1,14 +1,14 @@
 from Standard.Base import all
 from Standard.Base.Errors.Common import Uninitialized_State
 from Standard.Base.Runtime import State
-import project.Test_Result.Test_Result
+
 import project.Clue.Clue
 import project.Group.Group
-import project.Suite.Suite
-import project.Suite.Suite_Builder
 import project.Spec.Spec
 import project.Spec_Result.Spec_Result
-
+import project.Suite.Suite
+import project.Suite.Suite_Builder
+import project.Test_Result.Test_Result
 
 ## Contains only static methods
 type Test
@@ -46,26 +46,27 @@ type Test
         if err.is_a matcher then Nothing else
             Test.fail ("Expected a " + matcher.to_text + ", but " + err.to_text + " was thrown instead.")
 
-        ## Expect a function to fail with the provided panic.
+    ## Expect a function to fail with the provided panic.
 
-           An alternative API to `expect_panic_with` where the order of arguments is
+       An alternative API to `expect_panic_with` where the order of arguments is
-           more natural - as it allows blocks without reordering the arguments.
+       more natural - as it allows blocks without reordering the arguments.
 
-           Arguments:
+       Arguments:
-           - matcher: The expected type of the panic thrown by `action`.
+       - matcher: The expected type of the panic thrown by `action`.
-           - action: The action to evaluate that is expected to fail with a panic.
+       - action: The action to evaluate that is expected to fail with a panic.
 
-           > Example
+       > Example
-             Expect that a computation should panic as part of a test.
+         Expect that a computation should panic as part of a test.
 
-                  import Standard.Examples
+              import Standard.Examples
-                  from Standard.Test import Test
+              from Standard.Test import Test
 
-                  example_expect_panic_with =
+              example_expect_panic_with =
-                      Test.expect_panic_with Examples.My_Error <|
+                  Test.expect_panic_with Examples.My_Error <|
-                          IO.println 'hello'
+                      IO.println 'hello'
-                          Examples.throw_panic
+                      Examples.throw_panic
-                          IO.println 'this is not reached'
+
+                      IO.println 'this is not reached'
     expect_panic : Any -> Any -> Test_Result
     expect_panic matcher ~action = Test.expect_panic_with action matcher
 

distribution/lib/Standard/Test_New/0.0.0-dev/src/Test_Reporter.enso

@@ -1,11 +1,11 @@
 private
 
 from Standard.Base import all
-from Standard.Base.Runtime import assert
 import Standard.Base.Runtime.Context
+from Standard.Base.Runtime import assert
 
-import project.Suite_Config.Suite_Config
 import project.Spec_Result.Spec_Result
+import project.Suite_Config.Suite_Config
 import project.Test.Test
 import project.Test_Result.Test_Result
 
@@ -74,7 +74,7 @@ print_single_result (test_result : Test_Result) (config : Suite_Config) =
                    groups.
    - builder: StringBuilder or Nothing. If StringBuilder, then a jUnit XML format is appended to
               that StringBuilder.
-print_report : Vector Test_Result -> Suite_Config -> (StringBuilder|Nothing) -> Nothing
+print_report : Vector Test_Result -> Suite_Config -> (StringBuilder | Nothing) -> Nothing
 print_report (test_results : Vector Test_Result) (config : Suite_Config) (builder : (StringBuilder | Nothing)) =
     distinct_group_names = test_results.map (_.group_name) . distinct
     results_per_group = distinct_group_names.fold Map.empty acc-> group_name->

distribution/lib/Standard/Test_New/0.0.0-dev/src/Test_Result.enso

@@ -5,17 +5,23 @@ import project.Spec_Result.Spec_Result
 
 ## A wrapper for `Spec_Result` that contains also name of the group and name of the spec.
 type Test_Result
+    ## PRIVATE
     Impl (group_name : Text) (spec_name : Text) (spec_result : Spec_Result) (time_taken : Duration)
 
+    ## PRIVATE
+       Render as Test_Result as Text.
     to_text self =
         "'" + self.group_name + "' '" + self.spec_name + "': " + self.spec_result.to_text
 
+    ## Was the test pending?
     is_pending self =
         self.spec_result.is_pending
 
+    ## Was the test successful?
     is_success self =
         self.spec_result.is_success
 
+    ## Was the test a failure?
     is_fail self =
         self.spec_result.is_fail
     

std-bits/table/src/main/java/org/enso/table/data/column/storage/BoolStorage.java

@@ -124,7 +124,7 @@ public final class BoolStorage extends Storage<Boolean> {
    */
   private Storage<?> fillMissingBoolean(boolean arg) {
     final var newValues = (BitSet) values.clone();
-    if (arg) {
+    if (arg != negated) {
       newValues.or(isMissing);
     } else {
       newValues.andNot(isMissing);

test/Base_Tests/src/Data/Json_Spec.enso

@@ -77,9 +77,9 @@ add_specs suite_builder =
             Json.parse '{"start": 15, "end": 20, "step": 3}' . into Range . should_equal (Range.Between 15 20 3)
 
         group_builder.specify "should be able to deserialize using into for multiple constructors" <|
-            Json.parse '{"than": 2}' . into Filter_Condition . should_fail_with Illegal_Argument
+            Json.parse '{"than": 2}' . into Statistic . should_fail_with Illegal_Argument
-            Json.parse '{"constructor": "Less", "than": 2}' . into Filter_Condition . should_equal (Filter_Condition.Less 2)
+            Json.parse '{"constructor": "Skew", "population": true}' . into Statistic . should_equal (Statistic.Skew True)
-            Json.parse '{"constructor": "NotARealOne", "than": 2}' . into Filter_Condition . should_fail_with Illegal_Argument
+            Json.parse '{"constructor": "NotARealOne", "population": true}' . into Statistic . should_fail_with Illegal_Argument
 
         group_builder.specify "should be able to convert a JS_Object into a Map using into" <|
             Json.parse '{"a": 15, "b": 20, "c": "X", "d": null}' . into Map . should_equal (Map.from_vector [["a", 15], ["b", 20], ["c", "X"], ["d", Nothing]])

test/Base_Tests/src/Data/List_Spec.enso

@@ -36,6 +36,7 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
 
         l.any (Filter_Condition.Greater 1) . should_be_true
         l.any (Filter_Condition.Less 0) . should_be_false
+        l.any (Filter_Condition.Equal_Or_Greater 1 Filter_Action.Remove) . should_be_false
 
         Test.expect_panic_with (l.any "invalid arg") Type_Error
 
@@ -47,6 +48,7 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
 
         l.all (Filter_Condition.Greater 0) . should_be_true
         l.all (Filter_Condition.Less 3) . should_be_false
+        l.any (Filter_Condition.Less 0 Filter_Action.Remove) . should_be_true
 
         Test.expect_panic_with (l.all "invalid arg") Type_Error
 
@@ -70,6 +72,7 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
         empty.find (==1) if_missing=Nothing . should_equal Nothing
 
         l.find (Filter_Condition.Greater 1) . should_equal 2
+        l.find (Filter_Condition.Less 2 Filter_Action.Remove) . should_equal 2
 
         Test.expect_panic_with (l.find "invalid arg") Type_Error
 
@@ -90,6 +93,7 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
         l.index_of 2 start=-4 . should_fail_with Index_Out_Of_Bounds
 
         l.index_of (Filter_Condition.Greater 1) . should_equal 1
+        l.index_of (Filter_Condition.Less 3 Filter_Action.Remove) . should_equal 2
         l.index_of "invalid arg" . should_equal Nothing
 
     group_builder.specify "should allow finding the last index of an element in the list with `.last_index_of`" <|
@@ -110,6 +114,7 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
 
         ll.last_index_of (Filter_Condition.Greater 1) . should_equal 5
         ll.last_index_of (Filter_Condition.Less 3) . should_equal 4
+        ll.last_index_of (Filter_Condition.Greater 2 Filter_Action.Remove) . should_equal 4
         ll.last_index_of "invalid arg" . should_equal Nothing
 
     group_builder.specify "should allow checking if the list is empty with `.is_empty`" <|
@@ -129,6 +134,7 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
     group_builder.specify "should filter elements by Filter_Condition" <|
         list = [1, 2, 3, 4, 5].to_list
         list.filter (Filter_Condition.Greater than=3) . should_equal [4, 5].to_list
+        list.filter (Filter_Condition.Greater than=3 action=Filter_Action.Remove) . should_equal [1, 2, 3].to_list
         list.filter (Filter_Condition.Less than=3.5) . should_equal [1, 2, 3].to_list
         list.filter (Filter_Condition.Equal to=3) . should_equal (List.Cons 3 List.Nil)
         list.filter (Filter_Condition.Not_Equal to=3) . should_equal [1, 2, 4, 5].to_list
@@ -136,14 +142,23 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
         list.filter (Filter_Condition.Equal_Or_Less than=(-1)) . should_equal List.Nil
         list.filter (Filter_Condition.Between 2 4) . should_equal [2, 3, 4].to_list
         list.filter (Filter_Condition.Is_In [7, 3, 2]) . should_equal [2, 3].to_list
-        list.filter (Filter_Condition.Not_In [7, 3, 2]) . should_equal [1, 4, 5].to_list
 
-        Test.expect_panic Type_Error (list.filter (Filter_Condition.Starts_With "a"))
-        list.filter Filter_Condition.Is_True . should_equal List.Nil
-        list.filter Filter_Condition.Is_False . should_equal List.Nil
         list.filter Filter_Condition.Is_Nothing . should_equal List.Nil
         list.filter Filter_Condition.Not_Nothing . should_equal list
 
+        ## Boolean based filters should fail with type error
+        Test.expect_panic Type_Error (list.filter Filter_Condition.Is_True)
+        Test.expect_panic Type_Error (list.filter Filter_Condition.Is_False)
+
+        ## Text based filters should fail with type error
+        Test.expect_panic Type_Error (list.filter (Filter_Condition.Starts_With "a"))
+        Test.expect_panic Type_Error (list.filter (Filter_Condition.Ends_With "a"))
+        Test.expect_panic Type_Error (list.filter (Filter_Condition.Contains "a"))
+        Test.expect_panic Type_Error (list.filter (Filter_Condition.Equal_Ignore_Case "a"))
+        Test.expect_panic Type_Error (list.filter (Filter_Condition.Like "a%"))
+        Test.expect_panic Type_Error (list.filter Filter_Condition.Is_Empty)
+        Test.expect_panic Type_Error (list.filter Filter_Condition.Not_Empty)
+
         txt = ["aaa", "bbb", "abab", "cccc", "baaa", "ś"].to_list
         txt.filter (Filter_Condition.Contains "a") . should_equal ["aaa", "abab", "baaa"].to_list
         txt.filter (Filter_Condition.Contains 'A' Case_Sensitivity.Sensitive) . should_equal [].to_list
@@ -151,12 +166,6 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
         txt.filter (Filter_Condition.Contains 's\u0301') . should_equal ["ś"].to_list
         txt.filter (Filter_Condition.Contains 'S\u0301' Case_Sensitivity.Sensitive) . should_equal [].to_list
         txt.filter (Filter_Condition.Contains 'S\u0301' Case_Sensitivity.Insensitive) . should_equal ["ś"].to_list
-        txt.filter (Filter_Condition.Not_Contains "a") . should_equal ["bbb", "cccc", "ś"].to_list
-        txt.filter (Filter_Condition.Not_Contains "A" Case_Sensitivity.Sensitive) . should_equal ["aaa", "bbb", "abab", "cccc", "baaa", "ś"].to_list
-        txt.filter (Filter_Condition.Not_Contains "A" Case_Sensitivity.Insensitive) . should_equal ["bbb", "cccc", "ś"].to_list
-        txt.filter (Filter_Condition.Not_Contains 's\u0301') . should_equal ["aaa", "bbb", "abab", "cccc", "baaa"].to_list
-        txt.filter (Filter_Condition.Not_Contains 'S\u0301' Case_Sensitivity.Sensitive) . should_equal ["aaa", "bbb", "abab", "cccc", "baaa", "ś"].to_list
-        txt.filter (Filter_Condition.Not_Contains 'S\u0301' Case_Sensitivity.Insensitive) . should_equal ["aaa", "bbb", "abab", "cccc", "baaa"].to_list
         txt.filter (Filter_Condition.Starts_With "a") . should_equal ["aaa", "abab"].to_list
         txt.filter (Filter_Condition.Starts_With "A" Case_Sensitivity.Sensitive) . should_equal [].to_list
         txt.filter (Filter_Condition.Starts_With "A" Case_Sensitivity.Insensitive) . should_equal ["aaa", "abab"].to_list
@@ -173,7 +182,6 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
         ["abab", "aaabaaaa", "ba"].to_list.filter (Filter_Condition.Like "ba") . should_equal (List.Cons "ba" List.Nil)
         ["abab", "aaabaaaa"].to_list.filter (Filter_Condition.Like "_ba_") . should_equal ["abab"].to_list
         ["abab", "aaabaaaa"].to_list.filter (Filter_Condition.Like "%ba__%") . should_equal ["aaabaaaa"].to_list
-        ["abab", "aaabaaaa"].to_list.filter (Filter_Condition.Not_Like "%ba%") . should_equal List.Nil
 
         mixed = [1, Nothing, "b"].to_list
         mixed.filter Filter_Condition.Is_Nothing . should_equal (List.Cons Nothing List.Nil)
@@ -192,6 +200,10 @@ add_specs suite_builder = suite_builder.group "List" group_builder->
         r2.first . should_equal (List.Cons 2 (List.Cons 3 List.Nil))
         r2.second . should_equal (List.Cons 1 List.Nil)
 
+        r2r = l.partition (Filter_Condition.Greater than=1 action=Filter_Action.Remove)
+        r2r.second . should_equal (List.Cons 2 (List.Cons 3 List.Nil))
+        r2r.first . should_equal (List.Cons 1 List.Nil)
+
         r3 = l.partition (Filter_Condition.Equal_Or_Greater than=10)
         r3.first . should_equal List.Nil
         r3.second . should_equal l

test/Base_Tests/src/Data/Range_Spec.enso

@@ -152,30 +152,48 @@ add_specs suite_builder = suite_builder.group "Range" group_builder->
 
     group_builder.specify "should filter elements by Filter_Condition" <|
         range = 1.up_to 6
-        range.filter (Filter_Condition.Greater than=3) . should_equal [4, 5]
+        range.filter (Filter_Condition.Greater 3) . should_equal [4, 5]
-        range.filter (Filter_Condition.Less than=3.5) . should_equal [1, 2, 3]
+        range.filter (Filter_Condition.Greater 3 Filter_Action.Remove) . should_equal [1, 2, 3]
-        range.filter (Filter_Condition.Equal to=3) . should_equal [3]
+        range.filter (Filter_Condition.Less 3.5) . should_equal [1, 2, 3]
-        range.filter (Filter_Condition.Not_Equal to=3) . should_equal [1, 2, 4, 5]
+        range.filter (Filter_Condition.Less 3.5 Filter_Action.Remove) . should_equal [4, 5]
-        range.filter (Filter_Condition.Equal_Or_Greater than=3) . should_equal [3, 4, 5]
+        range.filter (Filter_Condition.Equal 3) . should_equal [3]
-        range.filter (Filter_Condition.Equal_Or_Less than=(-1)) . should_equal []
+        range.filter (Filter_Condition.Equal 3 Filter_Action.Remove) . should_equal [1, 2, 4, 5]
+        range.filter (Filter_Condition.Not_Equal 3) . should_equal [1, 2, 4, 5]
+        range.filter (Filter_Condition.Not_Equal 3 Filter_Action.Remove) . should_equal [3]
+        range.filter (Filter_Condition.Equal_Or_Greater 3) . should_equal [3, 4, 5]
+        range.filter (Filter_Condition.Equal_Or_Greater 3 Filter_Action.Remove) . should_equal [1, 2]
+        range.filter (Filter_Condition.Equal_Or_Less (-1)) . should_equal []
+        range.filter (Filter_Condition.Equal_Or_Less (-1) Filter_Action.Remove) . should_equal [1, 2, 3, 4, 5]
         range.filter (Filter_Condition.Between 2 4) . should_equal [2, 3, 4]
         range.filter (Filter_Condition.Between 2.1 4.5) . should_equal [3, 4]
+        range.filter (Filter_Condition.Between 2 4 Filter_Action.Remove) . should_equal [1, 5]
         range.filter (Filter_Condition.Is_In [7, 3, 2]) . should_equal [2, 3]
-        range.filter (Filter_Condition.Not_In [7, 3, 2]) . should_equal [1, 4, 5]
+        range.filter (Filter_Condition.Is_In [7, 3, 2] Filter_Action.Remove) . should_equal [1, 4, 5]
 
-        Test.expect_panic Type_Error (range.filter (Filter_Condition.Starts_With "a"))
-        Test.expect_panic Type_Error (range.filter (Filter_Condition.Equal_Ignore_Case "a"))
-        range.filter (Filter_Condition.Like "a%") . should_fail_with Type_Error
-        range.filter (Filter_Condition.Not_Like "a_") . should_fail_with Type_Error
         range.filter Filter_Condition.Is_Nan . should_equal []
+        range.filter (Filter_Condition.Is_Nan Filter_Action.Remove) . should_equal [1, 2, 3, 4, 5]
         range.filter Filter_Condition.Is_Infinite . should_equal []
+        range.filter (Filter_Condition.Is_Infinite Filter_Action.Remove) . should_equal [1, 2, 3, 4, 5]
         range.filter Filter_Condition.Is_Finite . should_equal [1, 2, 3, 4, 5]
-        range.filter Filter_Condition.Is_True . should_equal []
+        range.filter (Filter_Condition.Is_Finite Filter_Action.Remove) . should_equal []
-        range.filter Filter_Condition.Is_False . should_equal []
+
         range.filter Filter_Condition.Is_Nothing . should_equal []
+        range.filter (Filter_Condition.Is_Nothing Filter_Action.Remove) . should_equal [1, 2, 3, 4, 5]
         range.filter Filter_Condition.Not_Nothing . should_equal [1, 2, 3, 4, 5]
-        range.filter Filter_Condition.Is_Empty . should_equal []
+        range.filter (Filter_Condition.Not_Nothing Filter_Action.Remove) . should_equal []
-        range.filter Filter_Condition.Not_Empty . should_equal [1, 2, 3, 4, 5]
+
+        ## Text based filters should fail with type error
+        Test.expect_panic Type_Error (range.filter (Filter_Condition.Starts_With "a"))
+        Test.expect_panic Type_Error (range.filter (Filter_Condition.Ends_With "a"))
+        Test.expect_panic Type_Error (range.filter (Filter_Condition.Contains "a"))
+        Test.expect_panic Type_Error (range.filter (Filter_Condition.Equal_Ignore_Case "a"))
+        Test.expect_panic Type_Error (range.filter (Filter_Condition.Like "a%"))
+        Test.expect_panic Type_Error (range.filter Filter_Condition.Is_Empty)
+        Test.expect_panic Type_Error (range.filter Filter_Condition.Not_Empty)
+
+        ## Boolean based filters should fail with type error
+        Test.expect_panic Type_Error (range.filter Filter_Condition.Is_True)
+        Test.expect_panic Type_Error (range.filter Filter_Condition.Is_False)
 
     group_builder.specify "should allow to partition its elements" <|
         elements = 0.up_to 10
@@ -183,14 +201,19 @@ add_specs suite_builder = suite_builder.group "Range" group_builder->
         r1.first . should_equal [0, 2, 4, 6, 8]
         r1.second . should_equal [1, 3, 5, 7, 9]
 
-        r2 = elements.partition (Filter_Condition.Greater than=3)
+        r2 = elements.partition (Filter_Condition.Greater 3)
         r2.first . should_equal [4, 5, 6, 7, 8, 9]
         r2.second . should_equal [0, 1, 2, 3]
 
+        r2r = elements.partition (Filter_Condition.Greater 3 Filter_Action.Remove)
+        r2r.first . should_equal [0, 1, 2, 3]
+        r2r.second . should_equal [4, 5, 6, 7, 8, 9]
+
     group_builder.specify "should allow iteration" <|
         vec_mut = Vector.new_builder
         1.up_to 6 . each (i -> vec_mut.append i)
         vec_mut.to_vector . should_equal [1, 2, 3, 4, 5]
+
     group_builder.specify "should allow iteration, with error propagation and early exit" <|
         vec_mut = Vector.new_builder
         result = 1.up_to 6 . each_propagate i->
@@ -198,6 +221,7 @@ add_specs suite_builder = suite_builder.group "Range" group_builder->
               vec_mut.append i
         result . should_fail_with Illegal_Argument
         vec_mut.to_vector . should_equal [1, 2]
+
     group_builder.specify "should allow iteration with index" <|
         vec_mut = Vector.new_builder
         5.up_to 8 . each_with_index ix-> elem->
@@ -208,36 +232,46 @@ add_specs suite_builder = suite_builder.group "Range" group_builder->
         5.up_to 10 . with_step 2 . each_with_index ix-> elem->
             vec_mut_2.append (Pair.new ix elem)
         vec_mut_2.to_vector . should_equal [Pair.new 0 5, Pair.new 1 7, Pair.new 2 9]
+
     group_builder.specify "should be able to be folded" <|
         1.up_to 6 . fold 0 (+) . should_equal 15
         1.up_to 1 . fold 123 (+) . should_equal 123
+
     group_builder.specify "should be able to perform a running fold" <|
         1.up_to 6 . running_fold 0 (+) . should_equal [1, 3, 6, 10, 15]
         1.up_to 1 . running_fold 123 (+) . should_equal []
+
     group_builder.specify "should be able to be reduced" <|
         1.up_to 6 . reduce (+) . should_equal 15
         1.up_to 6 . with_step 2 . reduce (+) . should_equal 9
         1.up_to 1 . reduce (+) . should_fail_with Empty_Error
         1.up_to 1 . reduce (+) 0 . should_equal 0
+
     group_builder.specify "should check all" <|
         1.up_to 10 . all (> 0) . should_be_true
         1.up_to 10 . all (< 0) . should_be_false
         1.up_to 10 . all (Filter_Condition.Greater 10) . should_be_false
+        1.up_to 10 . all (Filter_Condition.Greater 10 Filter_Action.Remove) . should_be_true
         Test.expect_panic_with (1.up_to 10 . all "invalid arg") Type_Error
+
     group_builder.specify "should check any" <|
         1.up_to 10 . any (> 5) . should_be_true
         1.up_to 10 . any (> 10) . should_be_false
         1.up_to 10 . any (Filter_Condition.Greater 5) . should_be_true
+        1.up_to 10 . any (Filter_Condition.Equal_Or_Greater 1 Filter_Action.Remove) . should_be_false
         Test.expect_panic_with (1.up_to 10 . any "invalid arg") Type_Error
+
     group_builder.specify "should find elements" <|
         1.up_to 10 . find (> 5) . should_equal 6
-        1.up_to 10 . find (Filter_Condition.Greater than=5) . should_equal 6
+        1.up_to 10 . find (Filter_Condition.Greater 5) . should_equal 6
+        1.up_to 10 . find (Filter_Condition.Equal_Or_Less 3 Filter_Action.Remove) . should_equal 4
         1.up_to 10 . find (> 10) . should_be_a Nothing
         1.up_to 10 . find (v-> v%4 == 0) start=6 . should_equal 8
         1.up_to 10 . find (< 5) start=6 . should_be_a Nothing
         1.up_to 10 . find (< 5) start=10 . should_fail_with Index_Out_Of_Bounds
         1.up_to 10 . find (< 5) start=10 . catch . should_equal (Index_Out_Of_Bounds.Error 10 10)
         Test.expect_panic_with (1.up_to 10 . find "invalid arg") Type_Error
+
     group_builder.specify "should find index of elements" <|
         1.up_to 10 . index_of (> 5) . should_equal 5
         1.up_to 10 . index_of 7 . should_equal 6
@@ -253,9 +287,11 @@ add_specs suite_builder = suite_builder.group "Range" group_builder->
         1.up_to 10 . index_of (< 5) start=10 . catch . should_equal (Index_Out_Of_Bounds.Error 10 10)
         1.up_to 10 . index_of (< 5) start=-1 . should_equal Nothing
         1.up_to 10 . index_of (< 5) start=-9 . should_equal 0
-        1.up_to 10 . index_of (Filter_Condition.Greater than=5) . should_equal 5
+        1.up_to 10 . index_of (Filter_Condition.Greater 5) . should_equal 5
+        1.up_to 10 . index_of (Filter_Condition.Less 5 Filter_Action.Remove) . should_equal 4
         1.up_to 10 . index_of "invalid arg" . should_fail_with Illegal_Argument
         1.up_to 10 . index_of 2.5 . should_fail_with Illegal_Argument
+
     group_builder.specify "should find last index of elements" <|
         1.up_to 10 . last_index_of (> 5) . should_equal 8
         1.up_to 10 . last_index_of 7 . should_equal 6
@@ -271,11 +307,14 @@ add_specs suite_builder = suite_builder.group "Range" group_builder->
         1.up_to 10 . last_index_of (< 5) start=9 . should_fail_with Index_Out_Of_Bounds
         1.up_to 10 . last_index_of (< 5) start=10 . catch . should_equal (Index_Out_Of_Bounds.Error 10 9)
         1.up_to 10 . last_index_of (< 5) start=-10 . should_fail_with Index_Out_Of_Bounds
-        1.up_to 10 . last_index_of (Filter_Condition.Greater than=5) . should_equal 8
+        1.up_to 10 . last_index_of (Filter_Condition.Greater 5) . should_equal 8
+        1.up_to 10 . last_index_of (Filter_Condition.Greater 5 Filter_Action.Remove) . should_equal 4
         1.up_to 10 . last_index_of "invalid arg" . should_fail_with Illegal_Argument
         1.up_to 10 . last_index_of 2.5 . should_fail_with Illegal_Argument
+
     group_builder.specify "should allow conversion to vector" <|
         1.up_to 6 . to_vector . should_equal [1, 2, 3, 4, 5]
+
     group_builder.specify "should allow reversing" <|
         1.up_to 6 . reverse . should_equal (5.down_to 0)
         5.down_to 0 . reverse . should_equal (1.up_to 6)
@@ -297,7 +336,6 @@ add_specs suite_builder = suite_builder.group "Range" group_builder->
         5.down_to 0 . contains 2.5 . should_fail_with Illegal_Argument
         5.down_to 0 . contains 3.0 . should_fail_with Illegal_Argument
 
-
     verify_contains range expected unexpected =
         expected.each x->
             if range.contains x . not then
@@ -305,10 +343,12 @@ add_specs suite_builder = suite_builder.group "Range" group_builder->
         unexpected.each x->
             if range.contains x then
                 Test.fail "Range "+range.to_text+" unexpectedly contained "+x.to_text+"."
+
     build_with_each range =
         builder = Vector.new_builder
         range.each builder.append
         builder.to_vector
+
     group_builder.specify "should behave correctly if it is empty" <|
         check_empty_range r =
             r.is_empty . should_be_true

test/Base_Tests/src/Data/Vector_Spec.enso

@@ -164,6 +164,7 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         vec.any (ix -> ix < 0) . should_be_false
 
         vec.any (Filter_Condition.Greater 0) . should_be_true
+        vec.any (Filter_Condition.Greater 0 Filter_Action.Remove) . should_be_false
         vec.any (Filter_Condition.Less 3) . should_be_true
         vec.any (Filter_Condition.Less 0) . should_be_false
 
@@ -175,6 +176,7 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         vec.all (ix -> ix < 5) . should_be_false
 
         vec.all (Filter_Condition.Greater 0) . should_be_true
+        vec.all (Filter_Condition.Greater 0 Filter_Action.Remove) . should_be_false
         vec.all (Filter_Condition.Less 3) . should_be_false
 
         Test.expect_panic_with matcher=Type_Error (vec.all "invalid argument")
@@ -203,55 +205,84 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         vec.filter (x -> x < 0) . should_equal []
         vec.filter (x -> if x == 2 then Error.throw <| My_Error.Error "foo" else True) . should_fail_with My_Error
 
-    group_builder.specify "should filter elements by Filter_Condition" <|
+    group_builder.specify "should filter numerical elements by Filter_Condition" <|
         vec = alter [1, 2, 3, 4, 5]
-        vec.filter (Filter_Condition.Greater than=3) . should_equal [4, 5]
+        vec.filter (Filter_Condition.Greater 3) . should_equal [4, 5]
-        vec.filter (Filter_Condition.Less than=3.5) . should_equal [1, 2, 3]
+        vec.filter (Filter_Condition.Greater 3 Filter_Action.Remove) . should_equal [1, 2, 3]
-        vec.filter (Filter_Condition.Equal to=3) . should_equal [3]
+        vec.filter (Filter_Condition.Less 3.5) . should_equal [1, 2, 3]
-        vec.filter (Filter_Condition.Equal to=3.0) . should_equal [3]
+        vec.filter (Filter_Condition.Less 3.5 Filter_Action.Remove) . should_equal [4, 5]
-        vec.filter (Filter_Condition.Equal to=3.1) . should_equal []
+        vec.filter (Filter_Condition.Equal 3) . should_equal [3]
-        vec.filter (Filter_Condition.Not_Equal to=3) . should_equal [1, 2, 4, 5]
+        vec.filter (Filter_Condition.Equal 3 Filter_Action.Remove) . should_equal [1, 2, 4, 5]
-        vec.filter (Filter_Condition.Equal_Or_Greater than=3) . should_equal [3, 4, 5]
+        vec.filter (Filter_Condition.Not_Equal 3) . should_equal [1, 2, 4, 5]
-        vec.filter (Filter_Condition.Equal_Or_Less than=(-1)) . should_equal []
+        vec.filter (Filter_Condition.Not_Equal 3 Filter_Action.Remove) . should_equal [3]
+        vec.filter (Filter_Condition.Equal_Or_Greater 3) . should_equal [3, 4, 5]
+        vec.filter (Filter_Condition.Equal_Or_Greater 3 Filter_Action.Remove) . should_equal [1, 2]
+        vec.filter (Filter_Condition.Equal_Or_Less (-1)) . should_equal []
+        vec.filter (Filter_Condition.Equal_Or_Less (-1) Filter_Action.Remove) . should_equal [1, 2, 3, 4, 5]
         vec.filter (Filter_Condition.Between 2 4) . should_equal [2, 3, 4]
         vec.filter (Filter_Condition.Between 2.1 4.5) . should_equal [3, 4]
+        vec.filter (Filter_Condition.Between 2 4 Filter_Action.Remove) . should_equal [1, 5]
         vec.filter (Filter_Condition.Is_In [7, 3, 2, 2, 2]) . should_equal [2, 3]
-        vec.filter (Filter_Condition.Is_In []) . should_equal []
+        vec.filter (Filter_Condition.Is_In [7, 3, 2] Filter_Action.Remove) . should_equal [1, 4, 5]
-        vec.filter (Filter_Condition.Not_In [7, 3, 2, 2]) . should_equal [1, 4, 5]
 
-        Test.expect_panic_with (vec.filter (Filter_Condition.Starts_With "a")) Type_Error
-        vec.filter Filter_Condition.Is_True . should_equal []
-        vec.filter Filter_Condition.Is_False . should_equal []
         vec.filter Filter_Condition.Is_Nothing . should_equal []
-        vec.filter Filter_Condition.Not_Nothing . should_equal vec
+        vec.filter (Filter_Condition.Is_Nothing Filter_Action.Remove) . should_equal [1, 2, 3, 4, 5]
+        vec.filter Filter_Condition.Not_Nothing . should_equal [1, 2, 3, 4, 5]
+        vec.filter (Filter_Condition.Not_Nothing Filter_Action.Remove) . should_equal []
 
-        txtvec = ["aaa", "bbb", "abab", "cccc", "baaa", "ś"]
+        numvec = alter [1, 2.5, Number.nan, Number.positive_infinity, Number.negative_infinity, 0]
+        # We need to use to_text because NaN!=NaN
+        numvec.filter Filter_Condition.Is_Nan . map .to_text . should_equal ["NaN"]
+        numvec.filter (Filter_Condition.Is_Nan Filter_Action.Remove) . should_equal [1, 2.5, Number.positive_infinity, Number.negative_infinity, 0]
+        numvec.filter Filter_Condition.Is_Infinite . should_equal [Number.positive_infinity, Number.negative_infinity]
+        numvec.filter (Filter_Condition.Is_Infinite Filter_Action.Remove) . length . should_equal 4
+        numvec.filter Filter_Condition.Is_Finite . should_equal [1, 2.5, 0]
+        numvec.filter (Filter_Condition.Is_Finite Filter_Action.Remove) . length . should_equal 3
+
+        ## Text based filters should fail with type error
+        Test.expect_panic Type_Error (vec.filter (Filter_Condition.Starts_With "a"))
+        Test.expect_panic Type_Error (vec.filter (Filter_Condition.Ends_With "a"))
+        Test.expect_panic Type_Error (vec.filter (Filter_Condition.Contains "a"))
+        Test.expect_panic Type_Error (vec.filter (Filter_Condition.Equal_Ignore_Case "a"))
+        Test.expect_panic Type_Error (vec.filter (Filter_Condition.Like "a%"))
+        Test.expect_panic Type_Error (vec.filter Filter_Condition.Is_Empty)
+        Test.expect_panic Type_Error (vec.filter Filter_Condition.Not_Empty)
+
+        ## Boolean based filters should fail with type error
+        Test.expect_panic Type_Error (vec.filter Filter_Condition.Is_True)
+        Test.expect_panic Type_Error (vec.filter Filter_Condition.Is_False)
+
+    group_builder.specify "should filter text elements by Filter_Condition" <|
+        txtvec = alter ["aaa", "bbb", "abab", "cccc", "baaa", "ś"]
         txtvec.filter (Filter_Condition.Contains "a") . should_equal ["aaa", "abab", "baaa"]
+        txtvec.filter (Filter_Condition.Contains "a" action=Filter_Action.Remove) . should_equal ["bbb", "cccc", "ś"]
         txtvec.filter (Filter_Condition.Contains 'A' Case_Sensitivity.Sensitive) . should_equal []
         txtvec.filter (Filter_Condition.Contains 'A' Case_Sensitivity.Insensitive) . should_equal ["aaa", "abab", "baaa"]
         txtvec.filter (Filter_Condition.Contains 's\u0301') . should_equal ["ś"]
         txtvec.filter (Filter_Condition.Contains 'S\u0301' Case_Sensitivity.Sensitive) . should_equal []
         txtvec.filter (Filter_Condition.Contains 'S\u0301' Case_Sensitivity.Insensitive) . should_equal ["ś"]
-        txtvec.filter (Filter_Condition.Not_Contains "a") . should_equal ["bbb", "cccc", "ś"]
+        Test.expect_panic_with (txtvec.filter (Filter_Condition.Contains 42)) Unsupported_Argument_Types
-        txtvec.filter (Filter_Condition.Not_Contains "A" Case_Sensitivity.Sensitive) . should_equal ["aaa", "bbb", "abab", "cccc", "baaa", "ś"]
-        txtvec.filter (Filter_Condition.Not_Contains "A" Case_Sensitivity.Insensitive) . should_equal ["bbb", "cccc", "ś"]
-        txtvec.filter (Filter_Condition.Not_Contains 's\u0301') . should_equal ["aaa", "bbb", "abab", "cccc", "baaa"]
-        txtvec.filter (Filter_Condition.Not_Contains 'S\u0301' Case_Sensitivity.Sensitive) . should_equal ["aaa", "bbb", "abab", "cccc", "baaa", "ś"]
-        txtvec.filter (Filter_Condition.Not_Contains 'S\u0301' Case_Sensitivity.Insensitive) . should_equal ["aaa", "bbb", "abab", "cccc", "baaa"]
         txtvec.filter (Filter_Condition.Starts_With "a") . should_equal ["aaa", "abab"]
+        txtvec.filter (Filter_Condition.Starts_With "a" action=Filter_Action.Remove) . should_equal ["bbb", "cccc", "baaa", "ś"]
         txtvec.filter (Filter_Condition.Starts_With "A" Case_Sensitivity.Sensitive) . should_equal []
         txtvec.filter (Filter_Condition.Starts_With "A" Case_Sensitivity.Insensitive) . should_equal ["aaa", "abab"]
+        Test.expect_panic_with (txtvec.filter (Filter_Condition.Starts_With 42)) Unsupported_Argument_Types
         txtvec.filter (Filter_Condition.Ends_With "a") . should_equal ["aaa", "baaa"]
+        txtvec.filter (Filter_Condition.Ends_With "a" action=Filter_Action.Remove) . should_equal ["bbb", "abab", "cccc", "ś"]
         txtvec.filter (Filter_Condition.Ends_With "A" Case_Sensitivity.Sensitive) . should_equal []
         txtvec.filter (Filter_Condition.Ends_With "A" Case_Sensitivity.Insensitive) . should_equal ["aaa", "baaa"]
+        Test.expect_panic_with (txtvec.filter (Filter_Condition.Ends_With 42)) Unsupported_Argument_Types
+
         txtvec.filter (Filter_Condition.Less than="a") . should_equal []
         txtvec.filter (Filter_Condition.Greater than="b") . should_equal ["bbb", "cccc", "baaa", "ś"]
         txtvec.filter (Filter_Condition.Between "b" "c") . should_equal ["bbb", "baaa"]
-        Test.expect_panic_with (txtvec.filter (Filter_Condition.Starts_With 42)) Unsupported_Argument_Types
-        txtvec.filter Filter_Condition.Is_True . should_equal []
         txtvec.filter (Filter_Condition.Is_In [1, 2]) . should_equal []
         txtvec.filter (Filter_Condition.Is_In ["bbb", 's\u0301', "bbb", "FOOBAR"]) . should_equal ["bbb", "ś"]
 
+        ## Boolean based filters should fail with type error
+        Test.expect_panic Type_Error (txtvec.filter Filter_Condition.Is_True)
+        Test.expect_panic Type_Error (txtvec.filter Filter_Condition.Is_False)
+
         alter ["", Nothing, " ", "a"] . filter (Filter_Condition.Is_Empty) . should_equal ["", Nothing]
         alter ["", Nothing, " ", "a"] . filter (Filter_Condition.Not_Empty) . should_equal [" ", "a"]
         alter ["abab", "aaabaaaa", "ba"] . filter (Filter_Condition.Like "ba") . should_equal ["ba"]
@@ -259,18 +290,23 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         alter ["abab", "aaabaaaa"] . filter (Filter_Condition.Like "%ba__%") . should_equal ["aaabaaaa"]
         alter ["aaaa", "bbbbb", "[ab]aaaa"] . filter (Filter_Condition.Like "[ab]%") . should_equal ["[ab]aaaa"]
         alter ["f.txt", "abc.*"] . filter (Filter_Condition.Like "%.*") . should_equal ["abc.*"]
-        alter ["f.txt", "abc.*"] . filter (Filter_Condition.Not_Like "%.*") . should_equal ["f.txt"]
 
         txt2 = alter ['a\n\n\n', 'a\n', 'a\n\n\nb', 'a\nb', 'caa\nbb']
         txt2.filter (Filter_Condition.Like 'a_') . should_equal ['a\n']
+        txt2.filter (Filter_Condition.Like 'a_' Filter_Action.Remove) . should_equal ['a\n\n\n', 'a\n\n\nb', 'a\nb', 'caa\nbb']
         txt2.filter (Filter_Condition.Like 'a%') . should_equal ['a\n\n\n', 'a\n', 'a\n\n\nb', 'a\nb']
         txt2.filter (Filter_Condition.Like 'a_b') . should_equal ['a\nb']
         txt2.filter (Filter_Condition.Like '%\nb') . should_equal ['a\n\n\nb', 'a\nb']
 
+        ## NUmber based filters should fail with type error
+        Test.expect_panic Type_Error (txtvec.filter Filter_Condition.Is_Nan)
+        Test.expect_panic Type_Error (txtvec.filter Filter_Condition.Is_Infinite)
+        Test.expect_panic Type_Error (txtvec.filter Filter_Condition.Is_Finite)
+
+    group_builder.specify "should filter unicode text elements by Filter_Condition" <|
         txt3 = alter ['śnieg', 's\u0301nieg', 'X', 'połać', 'połac\u0301']
         txt3.filter (Filter_Condition.Starts_With 'ś') . should_equal ['śnieg', 's\u0301nieg']
         txt3.filter (Filter_Condition.Contains 'ś') . should_equal ['śnieg', 's\u0301nieg']
-        txt3.filter (Filter_Condition.Not_Contains 'ś') . should_equal ['X', 'połać', 'połac\u0301']
         txt3.filter (Filter_Condition.Ends_With 'ś') . should_equal []
         txt3.filter (Filter_Condition.Ends_With 'ć') . should_equal ['połać', 'połac\u0301']
         ## There is a bug with Java Regex in Unicode normalized mode (CANON_EQ) with quoting.
@@ -284,19 +320,12 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         txt4.filter (Filter_Condition.Equal_Ignore_Case 's\u0301') . should_equal ['ś', 'Ś']
         txt4.filter (Filter_Condition.Equal_Ignore_Case 'FFI') . should_equal ['ffi']
 
+    group_builder.specify "should filter mixed elements by Filter_Condition" <|
         mixed = alter [1, Nothing, "b"]
         mixed.filter Filter_Condition.Is_Nothing . should_equal [Nothing]
         mixed.filter Filter_Condition.Not_Nothing . should_equal [1, "b"]
-        mixed.filter Filter_Condition.Is_Empty . should_equal [Nothing]
+        Test.expect_panic Type_Error (mixed.filter Filter_Condition.Is_Empty)
-        mixed.filter Filter_Condition.Not_Empty . should_equal [1, "b"]
+        Test.expect_panic Type_Error (mixed.filter Filter_Condition.Not_Empty)
-
-        numvec = alter [1, 2.5, Number.nan, Number.positive_infinity, Number.negative_infinity, 0]
-        # We need to use to_text because NaN!=NaN
-        numvec.filter Filter_Condition.Is_Nan . map .to_text . should_equal ["NaN"]
-        numvec.filter Filter_Condition.Is_Infinite . should_equal [Number.positive_infinity, Number.negative_infinity]
-        numvec.filter Filter_Condition.Is_Finite . should_equal [1, 2.5, 0]
-
-        Test.expect_panic Type_Error (txtvec.filter Filter_Condition.Is_Finite)
 
         (alter [2, "a"]).filter (Filter_Condition.Greater 1) . should_fail_with Incomparable_Values
 
@@ -320,8 +349,6 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         txtvec.filter (Filter_Condition.Starts_With "a") . should_equal ["abab"]
         txtvec.filter (Filter_Condition.Ends_With "a") . should_equal ["baaa"]
         txtvec.filter (Filter_Condition.Like "b%a") . should_equal ["baaa"]
-        # Nothing is not included in the negation either
-        txtvec.filter (Filter_Condition.Not_Like "b%a") . should_equal ["abab", "cccc", "BAAA"]
 
         (alter ["a", 2, Nothing, 3]).filter (Filter_Condition.Is_In [Nothing, 2]) . should_equal [2, Nothing]
 
@@ -340,11 +367,12 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         (alter [1, 2, 3, 4] . filter_with_index ix-> _-> if ix == 1 then Error.throw <| My_Error.Error "foo" else True) . should_fail_with My_Error
 
     group_builder.specify "should partition elements" <|
-        vec = alter [1, 2, 3, 4, 5]
+        vec = alter [1, 2, 3, 4, 5, Nothing]
-        vec.partition (x -> x % 2 == 0) . should_equal <| Pair.new [2, 4] [1, 3, 5]
+        vec.partition (x -> x.is_nothing.not && x%2==0) . should_equal <| Pair.new [2, 4] [1, 3, 5, Nothing]
         (vec . partition x-> if x == 1 then Error.throw <| My_Error.Error "foo" else True) . should_fail_with My_Error
 
-        vec.partition (Filter_Condition.Between 2 4) . should_equal <| Pair.new [2, 3, 4] [1, 5]
+        vec.partition (Filter_Condition.Between 2 4) . should_equal <| Pair.new [2, 3, 4] [1, 5, Nothing]
+        vec.partition (Filter_Condition.Between 2 4 Filter_Action.Remove) . should_equal <| Pair.new [1, 5, Nothing] [2, 3, 4]
 
         Test.expect_panic_with matcher=Type_Error (vec.partition "invalid arg")
 
@@ -462,6 +490,7 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         input.find (x -> x%3 == 3) if_missing=Nothing . should_equal Nothing
 
         input.find (Filter_Condition.Greater 5) . should_equal 6
+        input.find (Filter_Condition.Less 5 Filter_Action.Remove) . should_equal 5
         Test.expect_panic_with matcher=Type_Error (input.find "invalid arg")
 
         alter ["b", "A", "c"] . find (Filter_Condition.Equal_Ignore_Case "a") . should_equal "A"
@@ -480,6 +509,7 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         input.index_of 2 start=-11 . should_fail_with Index_Out_Of_Bounds
 
         input.index_of (Filter_Condition.Equal_Or_Greater 2) . should_equal 1
+        input.index_of (Filter_Condition.Less 3 Filter_Action.Remove) . should_equal 2
         input.index_of "text" . should_equal Nothing
 
     group_builder.specify "should allow finding the last index of a value" <|
@@ -494,6 +524,7 @@ type_spec suite_builder name alter = suite_builder.group name group_builder->
         input.last_index_of 2 start=-11 . should_fail_with Index_Out_Of_Bounds
 
         input.last_index_of (Filter_Condition.Equal_Or_Greater 2) . should_equal input.length-2
+        input.last_index_of (Filter_Condition.Less 3 Filter_Action.Remove) . should_equal 6
         input.last_index_of "text" . should_equal Nothing
 
     group_builder.specify "should be convertible to a list" <|

test/Table_Tests/src/Common_Table_Operations/Column_Operations_Spec.enso

@@ -596,6 +596,18 @@ add_specs suite_builder setup =
             actual.at "col1" . to_vector . should_equal [1000, 200, 1000, 400, 500, 1000]
             actual.column_names . should_equal ["col0", "col_between", "col1", "def"]
 
+        group_builder.specify "fill_nothing should cope with notted boolean columns" <|
+            t = table_builder [["col0", [True, False, Nothing, True]], ["colTrue", [True, True, True, True]], ["colFalse", [False, False, False, False]]]
+            s = t.set (t.at "col0" . not) "col1"
+            s_false = s.fill_nothing ["col1"] False
+            s_false.at "col1" . to_vector . should_equal [False, True, False, False]
+            s_false_2 = s.fill_nothing ["col1"] (s.at "colFalse")
+            s_false_2.at "col1" . to_vector . should_equal [False, True, False, False]
+            s_true = s.fill_nothing ["col1"] True
+            s_true.at "col1" . to_vector . should_equal [False, True, True, False]
+            s_true_2 = s.fill_nothing ["col1"] (s.at "colTrue")
+            s_true_2.at "col1" . to_vector . should_equal [False, True, True, False]
+
     suite_builder.group prefix+"Table.text_replace" group_builder->
         data = Data.setup create_connection_fn
 

test/Table_Tests/src/Common_Table_Operations/Derived_Columns_Spec.enso

@@ -136,6 +136,7 @@ add_specs suite_builder setup =
         group_builder.specify "if" <|
             t = table_builder [["A", [1, 100]], ["B", [10, 40]], ["C", [23, 55]]]
             t.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Greater than=(Column_Ref.Name "B"))) "Z" . at "Z" . to_vector . should_equal [False, True]
+            t.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Greater than=(Column_Ref.Name "B") Filter_Action.Remove)) "Z" . at "Z" . to_vector . should_equal [True, False]
             t.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Greater than=20) "T" "F") "Z" . at "Z" . to_vector . should_equal ["F", "T"]
             t.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Less than=20) (Column_Ref.Name "B") (Column_Ref.Name "C")) "Z" . at "Z" . to_vector . should_equal [10, 55]
 
@@ -148,19 +149,15 @@ add_specs suite_builder setup =
             t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Equal_Ignore_Case "C") "==" "!=") "Z" . at "Z" . to_vector . should_equal ["!=", "=="]
 
             t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Is_In ["x", "a", "dd"]) "TT" "FF") "Z" . at "Z" . to_vector . should_equal ["TT", "FF"]
-            t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Not_In ["x", "a", "dd"]) "TT" "FF") "Z" . at "Z" . to_vector . should_equal ["FF", "TT"]
             t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Is_In []) "TT" "FF") "Z" . at "Z" . to_vector . should_equal ["FF", "FF"]
-            t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Not_In []) "TT" "FF") "Z" . at "Z" . to_vector . should_equal ["TT", "TT"]
 
             # Passing a column does not work row-by-row, but looks at whole column contents.
             t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Is_In (t2.at "B")) "TT" "FF") "Z" . at "Z" . to_vector . should_equal ["FF", "TT"]
             t3 = table_builder [["x", ["e", "e", "a"]]]
             t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Is_In (t3.at "x")) "TT" "FF") "Z" . at "Z" . to_vector . should_equal ["TT", "FF"]
 
-            # Thus, passing a Column_Ref into Is_In/Not_In is not allowed as it would be confusing.
+            # Thus, passing a Column_Ref into Is_In is not allowed as it would be confusing.
             t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Is_In (Column_Ref.Name "B")) "TT" "FF") . should_fail_with Illegal_Argument
-            t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Not_In (Column_Ref.Name "B")) "TT" "FF") . should_fail_with Illegal_Argument
-            t2.set (Column_Operation.If (Column_Ref.Name "A") (Filter_Condition.Not_In [Column_Ref.Name "B", "X"]) "TT" "FF") . should_fail_with Illegal_Argument
 
         group_builder.specify "text" <|
             t = table_builder [["A", ["  a ", "b"]], ["B", ["c", " d    "]]]

test/Table_Tests/src/Common_Table_Operations/Filter_Spec.enso

@@ -49,19 +49,29 @@ add_specs suite_builder setup =
 
         group_builder.specify "by integer comparisons" <|
             t = table_builder [["ix", [1, 2, 3, 4, 5]], ["X", [100, 3, Nothing, 4, 12]], ["Y", [100, 4, 2, Nothing, 11]]]
-            t1 = t.filter "X" (Filter_Condition.Less than=10)
+            t.filter "X" (Filter_Condition.Less than=10) . at "X" . to_vector . should_equal [3, 4]
-            t1.at "ix" . to_vector . should_equal [2, 4]
-            t1.at "X" . to_vector . should_equal [3, 4]
             t.filter "X" (Filter_Condition.Less than=4) . at "X" . to_vector . should_equal [3]
+            t.filter "X" (Filter_Condition.Less than=4 action=Filter_Action.Remove) . at "X" . to_vector . should_equal [100, Nothing, 4, 12]
             t.filter "X" (Filter_Condition.Equal_Or_Less than=4) . at "X" . to_vector . should_equal [3, 4]
+            t.filter "X" (Filter_Condition.Equal_Or_Less than=4 action=Filter_Action.Remove) . at "X" . to_vector . should_equal [100, Nothing, 12]
             t.filter "X" (Filter_Condition.Greater than=4) . at "X" . to_vector . should_equal [100, 12]
+            t.filter "X" (Filter_Condition.Greater than=4 action=Filter_Action.Remove) . at "X" . to_vector . should_equal [3, Nothing, 4]
             t.filter "X" (Filter_Condition.Equal_Or_Greater than=4) . at "X" . to_vector . should_equal [100, 4, 12]
+            t.filter "X" (Filter_Condition.Equal_Or_Greater than=4 action=Filter_Action.Remove) . at "X" . to_vector . should_equal [3, Nothing]
             t.filter "X" (Filter_Condition.Between 4 100) . at "X" . to_vector . should_equal [100, 4, 12]
-            t2 = t.filter "X" (Filter_Condition.Equal to=100)
+            t.filter "X" (Filter_Condition.Between 4 100 action=Filter_Action.Remove) . at "X" . to_vector . should_equal [3, Nothing]
-            t2 . at "X" . to_vector . should_equal [100]
+            t.filter "X" (Filter_Condition.Equal to=100) . at "X" . to_vector . should_equal [100]
-            t2 . at "ix" . to_vector . should_equal [1]
-
             t.filter "X" (Filter_Condition.Equal to=123) . at "X" . to_vector . should_equal []
+            t.filter "X" (Filter_Condition.Equal to=3 action=Filter_Action.Remove) . at "X" . to_vector . should_equal [100, Nothing, 4, 12]
+
+            t.filter "X" (Filter_Condition.Is_Finite) . at "ix" . to_vector . should_equal [1, 2, 4, 5]
+            t.filter "X" (Filter_Condition.Is_Finite action=Filter_Action.Remove) . at "ix" . to_vector . should_equal [3]
+            t.filter "X" (Filter_Condition.Is_Infinite) . at "ix" . to_vector . should_equal []
+            t.filter "X" (Filter_Condition.Is_Infinite action=Filter_Action.Remove) . at "ix" . to_vector . should_equal [1, 2, 3, 4, 5]
+            if test_selection.is_nan_and_nothing_distinct then
+                t.filter "X" (Filter_Condition.Is_Nan) . at "ix" . to_vector . should_equal []
+                t.filter "X" (Filter_Condition.Is_Nan action=Filter_Action.Remove) . at "ix" . to_vector . should_equal [1, 2, 3, 4, 5]
+
             v = t.filter "X" (Filter_Condition.Equal to="SOME TEXT :)") . at "X" . to_vector
             ## We do not do typechecking at Enso level here, as it is
                DB-dependent if such mixing is allowed, so we will rely on an SQL
@@ -71,25 +81,26 @@ add_specs suite_builder setup =
                 False -> v.should_fail_with SQL_Error
 
             t.filter "X" (Filter_Condition.Equal to=(t.at "Y")) . at "X" . to_vector . should_equal [100]
+            t.filter "X" (Filter_Condition.Equal to=(t.at "Y") action=Filter_Action.Remove) . at "X" . to_vector . should_equal [3, Nothing, 4, 12]
             t.filter "X" (Filter_Condition.Less than=(t.at "Y")) . at "X" . to_vector . should_equal [3]
+            t.filter "X" (Filter_Condition.Less than=(t.at "Y") action=Filter_Action.Remove) . at "X" . to_vector . should_equal [100, Nothing, 4, 12]
             t.filter "X" (Filter_Condition.Equal_Or_Less than=(t.at "Y")) . at "X" . to_vector . should_equal [100, 3]
+            t.filter "X" (Filter_Condition.Equal_Or_Less than=(t.at "Y") action=Filter_Action.Remove) . at "X" . to_vector . should_equal [Nothing, 4, 12]
             t.filter "X" (Filter_Condition.Equal_Or_Greater than=(t.at "Y")) . at "X" . to_vector . should_equal [100, 12]
+            t.filter "X" (Filter_Condition.Equal_Or_Greater than=(t.at "Y") action=Filter_Action.Remove) . at "X" . to_vector . should_equal [3, Nothing, 4]
             t.filter "X" (Filter_Condition.Greater than=(t.at "Y")) . at "X" . to_vector . should_equal [12]
+            t.filter "X" (Filter_Condition.Greater than=(t.at "Y") action=Filter_Action.Remove) . at "X" . to_vector . should_equal [100, 3, Nothing, 4]
             t.filter "Y" (Filter_Condition.Between (t.at "ix") 100) . at "Y" . to_vector . should_equal [100, 4, 11]
+            t.filter "Y" (Filter_Condition.Between (t.at "ix") 100 action=Filter_Action.Remove) . at "Y" . to_vector . should_equal [2, Nothing]
 
             t.filter "X" (Filter_Condition.Equal to=(Column_Ref.Name "Y")) . at "X" . to_vector . should_equal [100]
+            t.filter "X" (Filter_Condition.Equal to=(Column_Ref.Expression "[Y]-1")) . at "X" . to_vector . should_equal [3]
             t.filter "X" (Filter_Condition.Less than=(Column_Ref.Name "Y")) . at "X" . to_vector . should_equal [3]
             t.filter "X" (Filter_Condition.Equal_Or_Less than=(Column_Ref.Name "Y")) . at "X" . to_vector . should_equal [100, 3]
             t.filter "X" (Filter_Condition.Equal_Or_Greater than=(Column_Ref.Name "Y")) . at "X" . to_vector . should_equal [100, 12]
             t.filter "X" (Filter_Condition.Greater than=(Column_Ref.Name "Y")) . at "X" . to_vector . should_equal [12]
             t.filter "Y" (Filter_Condition.Between (Column_Ref.Name "ix") 100) . at "Y" . to_vector . should_equal [100, 4, 11]
 
-            t.filter "X" (Filter_Condition.Is_Finite) . at "ix" . to_vector . should_equal [1, 2, 4, 5]
-            t.filter "X" (Filter_Condition.Is_Infinite) . at "ix" . to_vector . should_equal []
-
-            if test_selection.is_nan_and_nothing_distinct then
-                t.filter "X" (Filter_Condition.Is_Nan) . at "ix" . to_vector . should_equal []
-
         group_builder.specify "by float operations" <|
             t = table_builder [["ix", [1, 2, 3, 4, 5, 6]], ["X", [100.0, 2.5, Nothing, Number.nan, Number.positive_infinity, Number.negative_infinity]]]
 
@@ -109,13 +120,14 @@ add_specs suite_builder setup =
             if test_selection.is_nan_and_nothing_distinct then
                 t.filter "X" Filter_Condition.Is_Nan . at "ix" . to_vector . should_equal [4]
 
-        group_builder.specify "Not_Equal test cases" pending="Specification needs clarifying, see: https://github.com/enso-org/enso/issues/5241#issuecomment-1480167927" <|
+        group_builder.specify "Not_Equal test cases" <|
             t = table_builder [["ix", [1, 2, 3, 4, 5]], ["X", [100, 3, Nothing, 4, 12]], ["Y", [100, 4, 2, Nothing, 11]]]
             t3 = t.filter "X" (Filter_Condition.Not_Equal to=100)
-            t3 . at "X" . to_vector . should_equal [3, Nothing, 4, 12]
+            t3 . at "X" . to_vector . should_equal [3, 4, 12]
-            t3 . at "ix" . to_vector . should_equal [2, 3, 4, 5]
+            t3 . at "ix" . to_vector . should_equal [2, 4, 5]
-            t.filter "X" (Filter_Condition.Not_Equal to=(t.at "Y")) . at "X" . to_vector . should_equal [3, Nothing, 4, 12]
+            t.filter "X" (Filter_Condition.Not_Equal to=(t.at "Y")) . at "X" . to_vector . should_equal [3, 12]
-            t.filter "X" (Filter_Condition.Not_Equal to=(Column_Ref.Name "Y")) . at "X" . to_vector . should_equal [3, Nothing, 4, 12]
+            t.filter "X" (Filter_Condition.Not_Equal to=(Column_Ref.Name "Y")) . at "X" . to_vector . should_equal [3, 12]
+            t.filter "X" (Filter_Condition.Not_Equal to=(Column_Ref.Expression "[Y]")) . at "X" . to_vector . should_equal [3, 12]
 
         group_builder.specify "by text comparisons" <|
             t = table_builder [["ix", [1, 2, 3, 4, 5]], ["X", ["abb", "baca", "b", Nothing, "c"]], ["Y", ["a", "b", "b", "c", "c"]]]
@@ -155,19 +167,20 @@ add_specs suite_builder setup =
             t = table_builder [["ix", [1, 2, 3, 4, 5]], ["X", ["abb", "bacb", "banana", Nothing, "nana"]], ["Y", ["a", "B", "d", "c", "a"]], ["Z", ["aaaaa", "bbbbb", "[ab]", "[ab]aaaa", "[ab]ccc"]]]
 
             t.filter "X" (Filter_Condition.Starts_With "ba") . at "X" . to_vector . should_equal ["bacb", "banana"]
+            t.filter "X" (Filter_Condition.Starts_With "ba" action=Filter_Action.Remove) . at "X" . to_vector . should_equal ["abb", Nothing, "nana"]
             t.filter "X" (Filter_Condition.Starts_With "BA" Case_Sensitivity.Sensitive) . at "X" . to_vector . should_equal []
             t.filter "X" (Filter_Condition.Starts_With "BA" Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["bacb", "banana"]
             t.filter "X" (Filter_Condition.Ends_With "na") . at "X" . to_vector . should_equal ["banana", "nana"]
+            t.filter "X" (Filter_Condition.Ends_With "na" action=Filter_Action.Remove) . at "X" . to_vector . should_equal ["abb", "bacb", Nothing]
             t.filter "X" (Filter_Condition.Ends_With "NA" Case_Sensitivity.Sensitive) . at "X" . to_vector . should_equal []
             t.filter "X" (Filter_Condition.Ends_With "NA" Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["banana", "nana"]
             t.filter "X" (Filter_Condition.Contains "ac") . at "X" . to_vector . should_equal ["bacb"]
+            t.filter "X" (Filter_Condition.Contains "ac" action=Filter_Action.Remove) . at "X" . to_vector . should_equal ["abb", "banana", Nothing, "nana"]
             t.filter "X" (Filter_Condition.Contains "AC" Case_Sensitivity.Sensitive) . at "X" . to_vector . should_equal []
             t.filter "X" (Filter_Condition.Contains "AC" Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["bacb"]
-            t.filter "X" (Filter_Condition.Not_Contains "ac") . at "X" . to_vector . should_equal ["abb", "banana", "nana"]
-            t.filter "X" (Filter_Condition.Not_Contains "AC" Case_Sensitivity.Sensitive) . at "X" . to_vector . should_equal ["abb", "bacb", "banana", "nana"]
-            t.filter "X" (Filter_Condition.Not_Contains "AC" Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["abb", "banana", "nana"]
 
             t.filter "X" (Filter_Condition.Starts_With (t.at "Y")) . at "X" . to_vector . should_equal ["abb"]
+            t.filter "X" (Filter_Condition.Starts_With (t.at "Y") action=Filter_Action.Remove) . at "X" . to_vector . should_equal ["bacb", "banana", Nothing, "nana"]
             t.filter "X" (Filter_Condition.Starts_With (t.at "Y") Case_Sensitivity.Sensitive) . at "X" . to_vector . should_equal ["abb"]
             t.filter "X" (Filter_Condition.Starts_With (t.at "Y") Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["abb", "bacb"]
             t.filter "X" (Filter_Condition.Ends_With (t.at "Y")) . at "X" . to_vector . should_equal ["nana"]
@@ -176,27 +189,21 @@ add_specs suite_builder setup =
             t.filter "X" (Filter_Condition.Contains (t.at "Y")) . at "X" . to_vector . should_equal ["abb", "nana"]
             t.filter "X" (Filter_Condition.Contains (t.at "Y") Case_Sensitivity.Sensitive) . at "X" . to_vector . should_equal ["abb", "nana"]
             t.filter "X" (Filter_Condition.Contains (t.at "Y") Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["abb", "bacb", "nana"]
-            t.filter "X" (Filter_Condition.Not_Contains (t.at "Y")) . at "X" . to_vector . should_equal ["bacb", "banana"]
-            t.filter "X" (Filter_Condition.Not_Contains (t.at "Y") Case_Sensitivity.Sensitive) . at "X" . to_vector . should_equal ["bacb", "banana"]
-            t.filter "X" (Filter_Condition.Not_Contains (t.at "Y") Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["banana"]
 
             t.filter "X" (Filter_Condition.Starts_With (Column_Ref.Name "Y")) . at "X" . to_vector . should_equal ["abb"]
             t.filter "X" (Filter_Condition.Ends_With (Column_Ref.Name "Y") Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["bacb", "nana"]
             t.filter "X" (Filter_Condition.Contains (Column_Ref.Name "Y") Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["abb", "bacb", "nana"]
-            t.filter "X" (Filter_Condition.Not_Contains (Column_Ref.Name "Y") Case_Sensitivity.Insensitive) . at "X" . to_vector . should_equal ["banana"]
 
         group_builder.specify "by text search (like, not_like)" <|
             t = table_builder [["ix", [1, 2, 3, 4, 5]], ["X", ["abb", "bacb", "banana", Nothing, "nana"]], ["Y", ["a", "B", "d", "c", "a"]], ["Z", ["aaaaa", "bbbbb", "[ab]", "[ab]aaaa", "[ab]ccc"]]]
 
             t.filter "X" (Filter_Condition.Like "%an%") . at "X" . to_vector . should_equal ["banana", "nana"]
+            t.filter "X" (Filter_Condition.Like "%an%" action=Filter_Action.Remove) . at "X" . to_vector . should_equal ["abb", "bacb", Nothing]
             t.filter "X" (Filter_Condition.Like "_a%") . at "X" . to_vector . should_equal ["bacb", "banana", "nana"]
             t.filter "X" (Filter_Condition.Like "%b") . at "X" . to_vector . should_equal ["abb", "bacb"]
             t.filter "X" (Filter_Condition.Like "nana") . at "X" . to_vector . should_equal ["nana"]
             t.filter "Z" (Filter_Condition.Like "[ab]_%") . at "Z" . to_vector . should_equal ["[ab]aaaa", "[ab]ccc"]
 
-            t.filter "X" (Filter_Condition.Not_Like "%b") . at "X" . to_vector . should_equal ["banana", "nana"]
-            t.filter "Z" (Filter_Condition.Not_Like "[ab]%") . at "Z" . to_vector . should_equal ["aaaaa", "bbbbb"]
-
         group_builder.specify "text operations should also match newlines" <|
             t = table_builder [["X", ['a\n\n\n', 'a\n', 'a\n\n\nb', 'a\nb', 'caa\nbb']]]
             t.filter "X" (Filter_Condition.Like 'a_') . at "X" . to_vector . should_equal ['a\n']
@@ -208,7 +215,6 @@ add_specs suite_builder setup =
             t.filter "X" (Filter_Condition.Ends_With '\nb') . at "X" . to_vector . should_equal ['a\n\n\nb', 'a\nb']
             t.filter "X" (Filter_Condition.Ends_With '\n') . at "X" . to_vector . should_equal ['a\n\n\n', 'a\n']
             t.filter "X" (Filter_Condition.Starts_With 'c') . at "X" . to_vector . should_equal ['caa\nbb']
-            t.filter "X" (Filter_Condition.Not_Contains '\nb') . at "X" . to_vector . should_equal ['a\n\n\n', 'a\n']
 
         if test_selection.supports_unicode_normalization then
             t = table_builder [["X", ['śnieg', 's\u0301nieg', 'X', Nothing, 'połać', 'połac\u0301']]]
@@ -217,7 +223,6 @@ add_specs suite_builder setup =
                 t.filter "X" (Filter_Condition.Contains 'ś') . at "X" . to_vector . should_equal ['śnieg', 's\u0301nieg']
                 t.filter "X" (Filter_Condition.Ends_With 'ś') . at "X" . to_vector . should_equal []
                 t.filter "X" (Filter_Condition.Ends_With 'ć') . at "X" . to_vector . should_equal ['połać', 'połac\u0301']
-                t.filter "X" (Filter_Condition.Not_Contains 'ś') . at "X" . to_vector . should_equal ['X', 'połać', 'połac\u0301']
 
                 # This should be replaced with the disabled test below, once the related bug is fixed.
                 t.filter "X" (Filter_Condition.Like 'ś%') . at "X" . to_vector . should_equal ['śnieg']
@@ -242,24 +247,18 @@ add_specs suite_builder setup =
             check_problem (t.filter "X" (Filter_Condition.Ends_With (t.at "ix")))
             check_problem (t.filter "X" (Filter_Condition.Contains (t.at "ix")))
             check_problem (t.filter "X" (Filter_Condition.Like (t.at "ix")))
-            check_problem (t.filter "X" (Filter_Condition.Not_Like (t.at "ix")))
-            check_problem (t.filter "X" (Filter_Condition.Not_Contains (t.at "ix")))
 
             check_problem (t.filter "X" (Filter_Condition.Equal_Ignore_Case (Column_Ref.Name "ix")))
             check_problem (t.filter "X" (Filter_Condition.Starts_With (Column_Ref.Name "ix")))
             check_problem (t.filter "X" (Filter_Condition.Ends_With (Column_Ref.Name "ix")))
             check_problem (t.filter "X" (Filter_Condition.Contains (Column_Ref.Name "ix")))
             check_problem (t.filter "X" (Filter_Condition.Like (Column_Ref.Name "ix")))
-            check_problem (t.filter "X" (Filter_Condition.Not_Like (Column_Ref.Name "ix")))
-            check_problem (t.filter "X" (Filter_Condition.Not_Contains (Column_Ref.Name "ix")))
 
             check_problem (t.filter "ix" (Filter_Condition.Equal_Ignore_Case "A"))
             check_problem (t.filter "ix" (Filter_Condition.Starts_With "A"))
             check_problem (t.filter "ix" (Filter_Condition.Ends_With "A"))
             check_problem (t.filter "ix" (Filter_Condition.Contains "A"))
             check_problem (t.filter "ix" (Filter_Condition.Like "A"))
-            check_problem (t.filter "ix" (Filter_Condition.Not_Like "A"))
-            check_problem (t.filter "ix" (Filter_Condition.Not_Contains "A"))
 
             check_problem (t.filter "ix" Filter_Condition.Is_Empty)
             check_problem (t.filter "ix" Filter_Condition.Not_Empty)
@@ -271,8 +270,6 @@ add_specs suite_builder setup =
             check_scalar_type_error_handling (t.filter "X" (Filter_Condition.Ends_With 42))
             check_scalar_type_error_handling (t.filter "X" (Filter_Condition.Contains 42))
             check_scalar_type_error_handling (t.filter "X" (Filter_Condition.Like 42))
-            check_scalar_type_error_handling (t.filter "X" (Filter_Condition.Not_Like 42))
-            check_scalar_type_error_handling (t.filter "X" (Filter_Condition.Not_Contains 42))
 
         group_builder.specify "by nulls" <|
             t = table_builder [["ix", [1, 2, 3, 4]], ["X", [Nothing, 1, Nothing, 4]]]
@@ -287,17 +284,11 @@ add_specs suite_builder setup =
         group_builder.specify "by an Is_In check" <|
             t = table_builder [["ix", [1, 2, 3, Nothing, 5, 6]], ["X", ["a", "b", "ccc", "X", "f", "2"]]]
             t1 = table_builder [["txt", ["X", "a", "c", Nothing]], ["int", [Nothing, 2, 5, 4]], ["bool", [True, Nothing, Nothing, True]]]
-            t2 = table_builder [["txt", ["X", "a", "c", "q"]], ["int", [123, 2, 5, 4]], ["bool", [True, True, True, True]]]
 
             t.filter "X" (Filter_Condition.Is_In (t1.at "txt")) . at "X" . to_vector . should_equal ["a", "X"]
             t.filter "X" (Filter_Condition.Is_In (t1.at "txt" . to_vector)) . at "X" . to_vector . should_equal ["a", "X"]
-            t.filter "X" (Filter_Condition.Not_In (t1.at "txt")) . at "X" . to_vector . should_equal []
-            t.filter "X" (Filter_Condition.Not_In (t2.at "txt")) . at "X" . to_vector . should_equal ["b", "ccc", "f", "2"]
-            t.filter "X" (Filter_Condition.Not_In (t1.at "txt" . to_vector)) . at "X" . to_vector . should_equal []
-            t.filter "X" (Filter_Condition.Not_In (t2.at "txt" . to_vector)) . at "X" . to_vector . should_equal ["b", "ccc", "f", "2"]
             t.filter "X" (Filter_Condition.Is_In ["ccc"]) . at "X" . to_vector . should_equal ["ccc"]
             t.filter "X" (Filter_Condition.Is_In []) . at "X" . to_vector . should_equal []
-            t.filter "X" (Filter_Condition.Not_In []) . at "X" . to_vector . should_equal ["a", "b", "ccc", "X", "f", "2"]
 
             if test_selection.allows_mixed_type_comparisons then
                 mixed = t.filter "X" (Filter_Condition.Is_In (t1.at "int")) . at "X" . to_vector
@@ -308,8 +299,6 @@ add_specs suite_builder setup =
             t.filter "ix" (Filter_Condition.Is_In (t1.at "int" . to_vector)) . at "ix" . to_vector . should_equal [2, 5]
             t.filter "ix" (Filter_Condition.Is_In [2, 5, 4]) . at "ix" . to_vector . should_equal [2, 5]
             t.filter "ix" (Filter_Condition.Is_In [Nothing]) . at "ix" . to_vector . should_equal []
-            t.filter "ix" (Filter_Condition.Not_In [Nothing]) . at "ix" . to_vector . should_equal []
-            t.filter "ix" (Filter_Condition.Not_In [1, 3]) . at "ix" . to_vector . should_equal [2, 5, 6]
 
             v1 = t.filter "X" (Filter_Condition.Is_In ["c", "f", "b", "b", "b", 15, Nothing]) . at "X" . to_vector
             case test_selection.allows_mixed_type_comparisons of
@@ -329,7 +318,7 @@ add_specs suite_builder setup =
             t3.filter "B" (Filter_Condition.Is_In [False]) . at "B" . to_vector . should_equal [False, False, False]
             t3.filter "C" (Filter_Condition.Is_In [False, False]) . at "C" . to_vector . should_equal [False]
 
-        group_builder.specify "does not allow Column_Ref in Is_In/Not_In because that would be confusing" <|
+        group_builder.specify "does not allow Column_Ref in Is_In because that would be confusing" <|
             ## Is In and Not In check if a value is contained anywhere in a provided collection (e.g. column),
                NOT on a row-by-row basis like all other operations. Column_Ref is used with row-by-row ops,
                so this would only cause confusion. Very rarely someone wants to filter a column by Is_In
@@ -459,7 +448,6 @@ add_specs suite_builder setup =
                 + [Filter_Condition.Less Nothing, Filter_Condition.Equal_Or_Less Nothing]
                 + [Filter_Condition.Equal_Or_Greater Nothing, Filter_Condition.Greater Nothing]
                 + [Filter_Condition.Between Nothing Nothing , Filter_Condition.Is_In [Nothing]]
-                + [Filter_Condition.Not_In [Nothing]]
                 + [Filter_Condition.Is_In [1, Nothing, 2]]
             fcs.map fc->
                 Test.with_clue fc.to_text <|

test/Table_Tests/src/Common_Table_Operations/Missing_Values_Spec.enso

@@ -75,7 +75,7 @@ add_specs suite_builder setup =
             ## TODO currently our builder does not allow all-null tables, so we
                create one with a 0 and remove it by filter. See #6159.
             t0 = table_builder [["X", [0, Nothing, Nothing, Nothing]]]
-            t1 = t0.filter "X" (Filter_Condition.Is_Nothing)
+            t1 = t0.filter "X" Filter_Condition.Is_Nothing
             t1.row_count . should_equal 3
             t1.at "X" . to_vector . should_equal [Nothing, Nothing, Nothing]
 
@@ -171,7 +171,7 @@ add_specs suite_builder setup =
 
         group_builder.specify "select_blank_columns and remove_blank_columns should deal with edge cases" <|
             t = table_builder [["X", [1, 2, 3, 4]]]
-            no_rows = t.filter "X" (Filter_Condition.Equal to=0)
+            no_rows = t.filter "X" Filter_Condition.Is_Nothing
             no_rows.row_count . should_equal 0
             no_rows.at "X" . to_vector . should_equal []
 

test/Table_Tests/src/Database/Codegen_Spec.enso

@@ -42,14 +42,17 @@ add_specs suite_builder =
         group_builder.teardown <|
             data.teardown
 
-        group_builder.specify "should serialize Tables and Columns to their SQL representation" pending="ToDo: decide on how we handle ==, see https://github.com/enso-org/enso/issues/5241" <|
+        group_builder.specify "should serialize Tables and Columns to their SQL representation" <|
             q1 = data.t1.filter (data.t1.at "A" == 42) . to_json
 
-            part1 = JS_Object.from_pairs [["sql_code", 'SELECT "T1"."A" AS "A", "T1"."B" AS "B", "T1"."C" AS "C" FROM "T1" AS "T1" WHERE ("T1"."A" = ']]
+            part1 = JS_Object.from_pairs [["sql_code", 'SELECT "T1"."A" AS "A", "T1"."B" AS "B", "T1"."C" AS "C" FROM "T1" AS "T1" WHERE (("T1"."A") = (']]
             part2_sub = JS_Object.from_pairs [["value", 42]]
             part2 = JS_Object.from_pairs [["sql_interpolation", part2_sub]]
-            part3 = JS_Object.from_pairs [["sql_code", ")"]]
+            part3 = JS_Object.from_pairs [["sql_code", ")) = ("]]
-            expected = JS_Object.from_pairs [["query", [part1, part2, part3]]] . to_text
+            part4_sub = JS_Object.from_pairs [["value", True]]
+            part4 = JS_Object.from_pairs [["sql_interpolation", part4_sub]]
+            part5 = JS_Object.from_pairs [["sql_code", ")"]]
+            expected = JS_Object.from_pairs [["query", [part1, part2, part3, part4, part5]]] . to_text
             q1.should_equal expected
 
             q2 = data.t1.at "A" . to_json
@@ -90,6 +93,9 @@ add_specs suite_builder =
             t2 = data.t1.filter "A" (Filter_Condition.Between 10 20)
             t2.to_sql.prepare . should_equal ['SELECT "T1"."A" AS "A", "T1"."B" AS "B", "T1"."C" AS "C" FROM "T1" AS "T1" WHERE ("T1"."A" BETWEEN ? AND ?)', [10, 20]]
 
+            t2r = data.t1.filter "A" (Filter_Condition.Between 10 20 Filter_Action.Remove)
+            t2r.to_sql.prepare . should_equal ['SELECT "T1"."A" AS "A", "T1"."B" AS "B", "T1"."C" AS "C" FROM "T1" AS "T1" WHERE (NOT CAST(COALESCE(("T1"."A" BETWEEN ? AND ?), ?) AS BOOLEAN))', [10, 20, False]]
+
         group_builder.specify "should generate an IN expression" <|
             t2 = data.t1.filter "A" (Filter_Condition.Is_In [1, 2, 'foo'])
             t2.to_sql.prepare . should_equal ['SELECT "T1"."A" AS "A", "T1"."B" AS "B", "T1"."C" AS "C" FROM "T1" AS "T1" WHERE "T1"."A" IN (?, ?, ?)', [1, 2, "foo"]]

test/Visualization_Tests/src/Lazy_Table_Spec.enso

@@ -4,7 +4,6 @@ from Standard.Table import Table
 
 import Standard.Examples
 import Standard.Visualization.Table as Table_Visualization
-import Standard.Visualization.Preprocessor as Preprocessor
 
 from Standard.Test_New import all
 

test/Visualization_Tests/src/Lazy_Text_Spec.enso

@@ -3,7 +3,6 @@ from Standard.Visualization import all
 
 import Standard.Examples
 import Standard.Visualization.Text as TextVis
-import Standard.Visualization.Preprocessor as Preprocessor
 
 from Standard.Test_New import all
 

tools/performance/benchmark-analysis/src/Main.enso

@@ -10,7 +10,7 @@ main =
     operator14 = var1.to_column "Color"
     operator16 = operator14.to_table
     operator40 = enso_project.data/'benchmarks-vectorized-3-2023-07-17.txt' . read (Delimited_Format.Delimited)
-    operator1 = operator40.filter 'Column 1' (Filter_Condition.Not_Contains "average")
+    operator1 = operator40.filter 'Column 1' (Filter_Condition.Contains "average" Filter_Action.Remove)
     operator3 = operator1.parse_to_columns 'Column 1' text1
     operator4 = operator3.select_columns ['Operation']
     operator5 = operator4.distinct