diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d63e85190f..359e9867292 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,12 +16,14 @@
 - [Support for reading from Tableau Hyper files.][10733]
 - [Mixed Decimal/Float arithmetic now throws an error; mixed comparisons now
   attach warnings.][10725]
+- [Support for creating Atoms in expressions.][10820]
 
 [10614]: https://github.com/enso-org/enso/pull/10614
 [10660]: https://github.com/enso-org/enso/pull/10660
 [10761]: https://github.com/enso-org/enso/pull/10761
 [10733]: https://github.com/enso-org/enso/pull/10733
 [10725]: https://github.com/enso-org/enso/pull/10725
+[10820]: https://github.com/enso-org/enso/pull/10820
 
 # Enso 2023.3
 
diff --git a/distribution/lib/Standard/AWS/0.0.0-dev/src/Database/Redshift/Internal/Redshift_Dialect.enso b/distribution/lib/Standard/AWS/0.0.0-dev/src/Database/Redshift/Internal/Redshift_Dialect.enso
index 16ded8eae0e..643a8a205ac 100644
--- a/distribution/lib/Standard/AWS/0.0.0-dev/src/Database/Redshift/Internal/Redshift_Dialect.enso
+++ b/distribution/lib/Standard/AWS/0.0.0-dev/src/Database/Redshift/Internal/Redshift_Dialect.enso
@@ -25,8 +25,8 @@ import Standard.Database.Internal.Statement_Setter.Statement_Setter
 import Standard.Database.SQL.SQL_Builder
 import Standard.Database.SQL_Statement.SQL_Statement
 import Standard.Database.SQL_Type.SQL_Type
-from Standard.Database.Errors import SQL_Error, Unsupported_Database_Operation
 from Standard.Database.Dialect import Temp_Table_Style
+from Standard.Database.Errors import SQL_Error, Unsupported_Database_Operation
 
 import project.Database.Redshift.Internal.Redshift_Error_Mapper.Redshift_Error_Mapper
 
diff --git a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Decimal.enso b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Decimal.enso
index e021caf556f..60ffd911187 100644
--- a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Decimal.enso
+++ b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Decimal.enso
@@ -470,7 +470,7 @@ type Decimal
              b = Decimal.new "20.33"
              a.add b (Math_Context.new 3)
              # => Decimal.new 30.5
-    # TODO: restore checked return type (here and elsewhere) after https://github.com/enso-org/enso/issues/10736
+       TODO: restore checked return type (here and elsewhere) after https://github.com/enso-org/enso/issues/10736
     add : Decimal -> Math_Context | Nothing -> Decimal ! Arithmetic_Error
     add self (that : Decimal) (math_context : Math_Context | Nothing = Nothing) -> Decimal ! Arithmetic_Error =
         error_if_from_float self that <| handle_java_exception <|
diff --git a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Numeric/Internal/Decimal_Internal.enso b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Numeric/Internal/Decimal_Internal.enso
index bf84d9ae37c..a6e7cda8a80 100644
--- a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Numeric/Internal/Decimal_Internal.enso
+++ b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Numeric/Internal/Decimal_Internal.enso
@@ -3,9 +3,9 @@ private
 import project.Data.Decimal.Decimal
 import project.Data.Numbers.Number
 import project.Data.Text.Text
-from project.Errors.Common import Loss_Of_Numeric_Precision
 import project.Warning.Warning
 from project.Data.Ordering import Comparable, Ordering
+from project.Errors.Common import Loss_Of_Numeric_Precision
 
 polyglot java import org.enso.base.numeric.Decimal_Utils
 
diff --git a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Period.enso b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Period.enso
index 5fc638d2866..a22722b65e6 100644
--- a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Period.enso
+++ b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Period.enso
@@ -46,12 +46,6 @@ type Date_Period
     Week (first_day:Day_Of_Week = Day_Of_Week.Monday)
 
     ## Represents a time period of a single calendar day.
-
-       ? Daylight Saving Time
-
-         Note that due to DST changes, some days may be slightly longer or
-         shorter. This date period will reflect that and still count such days
-         as one day. For a measure of exactly 24 hours, use `Time_Period.Day`.
     Day
 
     ## PRIVATE
@@ -67,7 +61,7 @@ type Date_Period
 
     ## PRIVATE
     adjust_end : (Date | Date_Time) -> (Date | Date_Time)
-    adjust_end self date = if self == Date_Period.Day then date else
+    adjust_end self date =
         adjuster = case self of
             Date_Period.Year -> TemporalAdjusters.lastDayOfYear
             Date_Period.Quarter -> Date_Period_Utils.quarter_end
diff --git a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Time.enso b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Time.enso
index 556c6e6b51e..c47ee1c2db7 100644
--- a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Time.enso
+++ b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Date_Time.enso
@@ -605,7 +605,7 @@ type Date_Time
     start_of self period=Date_Period.Month =
         adjusted = period.adjust_start self
         case period of
-            _ : Date_Period -> Time_Period.Day.adjust_start adjusted
+            _ : Date_Period -> Date_Period.Day.adjust_start adjusted
             _ : Time_Period -> adjusted
 
     ## GROUP DateTime
@@ -616,7 +616,7 @@ type Date_Time
     end_of self period=Date_Period.Month =
         adjusted = period.adjust_end self
         case period of
-            _ : Date_Period -> Time_Period.Day.adjust_end adjusted
+            _ : Date_Period -> Date_Period.Day.adjust_end adjusted
             _ : Time_Period -> adjusted
 
     ## ALIAS time to date
@@ -668,7 +668,6 @@ type Date_Time
             Date_Period.Month       -> self.month
             Date_Period.Week _      -> self.week_of_year locale=Nothing
             Date_Period.Day         -> self.day
-            Time_Period.Day         -> self.day
             Time_Period.Hour        -> self.hour
             Time_Period.Minute      -> self.minute
             Time_Period.Second      -> self.second
diff --git a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Time_Of_Day.enso b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Time_Of_Day.enso
index 7397e451179..7a18e695fdb 100644
--- a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Time_Of_Day.enso
+++ b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Time_Of_Day.enso
@@ -272,13 +272,13 @@ type Time_Of_Day
        ICON time
        Returns the first time within the `Time_Period` containing self.
     start_of : Time_Period -> Time_Of_Day
-    start_of self period=Time_Period.Day = period.adjust_start self
+    start_of self period=Time_Period.Hour = period.adjust_start self
 
     ## GROUP DateTime
        ICON time
        Returns the last time within the `Time_Period` containing self.
     end_of : Time_Period -> Time_Of_Day
-    end_of self period=Time_Period.Day = period.adjust_end self
+    end_of self period=Time_Period.Hour = period.adjust_end self
 
     ## GROUP Conversions
        ICON convert
@@ -318,7 +318,6 @@ type Time_Of_Day
     date_part : Time_Period -> Integer
     date_part self (period : Time_Period) =
         case period of
-            Time_Period.Day         -> Error.throw (Illegal_Argument.Error "The Time_Of_Day does not have a day part.")
             Time_Period.Hour        -> self.hour
             Time_Period.Minute      -> self.minute
             Time_Period.Second      -> self.second
@@ -339,11 +338,8 @@ type Time_Of_Day
        - end: A time of day to compute the difference from.
        - period: The period to compute the difference in.
     date_diff : Time_Of_Day -> Time_Period -> Integer
-    date_diff self (end : Time_Of_Day) (period : Time_Period) = case period of
-        Time_Period.Day ->
-            Error.throw (Illegal_Argument.Error "The Time_Of_Day does not have a day part to compute a difference in days.")
-        _ ->
-            Time_Utils.unit_time_difference period.to_java_unit self end
+    date_diff self (end : Time_Of_Day) (period : Time_Period) =
+        Time_Utils.unit_time_difference period.to_java_unit self end
 
     ## GROUP DateTime
        ICON time
@@ -353,11 +349,8 @@ type Time_Of_Day
        - amount: An integer specifying by how many periods to shift the time.
        - period: The period by which to shift.
     date_add : Integer -> Time_Period -> Time_Of_Day
-    date_add self (amount : Integer) (period : Time_Period) = case period of
-        Time_Period.Day ->
-            Error.throw (Illegal_Argument.Error "The Time_Of_Day does not have a day part to add days to.")
-        _ ->
-            Time_Utils.unit_time_add period.to_java_unit self amount
+    date_add self (amount : Integer) (period : Time_Period) =
+        Time_Utils.unit_time_add period.to_java_unit self amount
 
     ## ALIAS add duration
        GROUP Operators
diff --git a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Time_Period.enso b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Time_Period.enso
index 3f62163339b..5b269e29983 100644
--- a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Time_Period.enso
+++ b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Time_Period.enso
@@ -10,15 +10,6 @@ polyglot java import org.enso.base.Time_Utils
 
 ## Represents a unit of time of a day or shorter.
 type Time_Period
-    ## Represents a time period of a single day, measured as 24 hours.
-
-       ? Daylight Saving Time
-
-         Note that due to DST changes, some days may be slightly longer or
-         shorter. This is not reflected in the duration of this time period. For
-         a calendar-oriented day period, use `Date_Period.Day` instead.
-    Day
-
     ## Represents a time period of an hour.
     Hour
 
@@ -38,10 +29,8 @@ type Time_Period
     Nanosecond
 
     ## PRIVATE
-       We treat the `Time_Period.Day` as a period of 24 hours, not a calendar day.
     to_java_unit : TemporalUnit
     to_java_unit self = case self of
-        Time_Period.Day -> CustomTemporalUnits.DAY_AS_24_HOURS
         Time_Period.Hour -> ChronoUnit.HOURS
         Time_Period.Minute -> ChronoUnit.MINUTES
         Time_Period.Second -> ChronoUnit.SECONDS
@@ -49,30 +38,19 @@ type Time_Period
         Time_Period.Microsecond -> ChronoUnit.MICROS
         Time_Period.Nanosecond -> ChronoUnit.NANOS
 
-    ## PRIVATE
-       A special case for `adjust_start` and `adjust_end` methods.
-       In this particular case, it seems better to treat `Time_Period.Day` as a
-       calendar day. Otherwise, the behaviour of `start_of` and `end_of` methods
-       near DST would become unintuitive.
-    to_java_unit_for_adjust : TemporalUnit
-    to_java_unit_for_adjust self = case self of
-        Time_Period.Day -> ChronoUnit.DAYS
-        _ -> self.to_java_unit
-
     ## PRIVATE
     adjust_start : (Time_Of_Day | Date_Time) -> (Time_Of_Day | Date_Time)
     adjust_start self date =
-        (Time_Utils.utils_for date).start_of_time_period date self.to_java_unit_for_adjust
+        (Time_Utils.utils_for date).start_of_time_period date self.to_java_unit
 
     ## PRIVATE
     adjust_end : (Time_Of_Day | Date_Time) -> (Time_Of_Day | Date_Time)
     adjust_end self date =
-        (Time_Utils.utils_for date).end_of_time_period date self.to_java_unit_for_adjust
+        (Time_Utils.utils_for date).end_of_time_period date self.to_java_unit
 
     ## PRIVATE
     to_duration : Duration
     to_duration self = case self of
-        Time_Period.Day -> Duration.new hours=24
         Time_Period.Hour -> Duration.new hours=1
         Time_Period.Minute -> Duration.new minutes=1
         Time_Period.Second -> Duration.new seconds=1
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/DB_Column.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/DB_Column.enso
index 0201fffed83..9f8779a2a0b 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/DB_Column.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/DB_Column.enso
@@ -159,6 +159,22 @@ type DB_Column
         if index < 0 then Error.throw (Unsupported_Database_Operation.Error "Reading backwards from end is not supported in-database. Use `read` to materialize the column.") else
             self.read (..First index+1) . get index default
 
+    ## GROUP Standard.Base.Selections
+       ICON parse3
+       Returns the first element in the column, if it exists.
+
+       If the column is empty, this method will return a dataflow error
+       containing an `Index_Out_Of_Bounds`.
+
+       > Example
+         Get the first element of a column.
+
+             import Standard.Examples
+
+             example_first = Examples.integer_column.first
+    first : Any ! Index_Out_Of_Bounds
+    first self = self.at 0
+
     ## GROUP Standard.Base.Metadata
        ICON metadata
        Returns the `Value_Type` associated with that column.
@@ -323,7 +339,7 @@ type DB_Column
        `other`.
     @locale Locale.default_widget
     equals_ignore_case : DB_Column | Any -> Locale -> DB_Column
-    equals_ignore_case self other locale=Locale.default =
+    equals_ignore_case self other locale:Locale=Locale.default =
         Value_Type.expect_text self <|
             Value_Type.expect_text other <|
                 Helpers.assume_default_locale locale <|
@@ -1208,7 +1224,7 @@ type DB_Column
          Sorting `column` in descending order.
              column.sort Sort_Direction.Descending
     sort : Sort_Direction -> DB_Column
-    sort self order=Sort_Direction.Ascending =
+    sort self order:Sort_Direction=..Ascending =
         self.to_table.sort [..Index 0 order] . at 0
 
     ## ALIAS first, head, keep, last, limit, sample, slice, tail, top
@@ -1249,7 +1265,7 @@ type DB_Column
        missing value (a Nothing or a column with missing values), the behaviour
        on these missing values is vendor specific.
     starts_with : DB_Column | Text -> Case_Sensitivity -> DB_Column
-    starts_with self other case_sensitivity=Case_Sensitivity.Default =
+    starts_with self other case_sensitivity:Case_Sensitivity=..Default =
         new_name = self.naming_helper.function_name "starts_with" [self, other]
         make_text_case_op self "STARTS_WITH" other case_sensitivity new_name
 
@@ -1267,7 +1283,7 @@ type DB_Column
        missing value (a Nothing or a column with missing values), the behaviour
        on these missing values is vendor specific.
     ends_with : DB_Column | Text -> Case_Sensitivity -> DB_Column
-    ends_with self other case_sensitivity=Case_Sensitivity.Default =
+    ends_with self other case_sensitivity:Case_Sensitivity=..Default =
         new_name = self.naming_helper.function_name "ends_with" [self, other]
         make_text_case_op self "ENDS_WITH" other case_sensitivity new_name
 
@@ -1347,7 +1363,7 @@ type DB_Column
        missing value (a Nothing or a column with missing values), the behaviour
        on these missing values is vendor specific.
     contains : DB_Column | Text -> Case_Sensitivity -> DB_Column
-    contains self other case_sensitivity=Case_Sensitivity.Default =
+    contains self other case_sensitivity:Case_Sensitivity=..Default =
         new_name = self.naming_helper.function_name "contains" [self, other]
         make_text_case_op self "CONTAINS" other case_sensitivity new_name
 
@@ -1461,7 +1477,7 @@ type DB_Column
              column.text_replace '"(.*?)"'.to_regex '($1)'
     @term make_regex_text_widget
     text_replace : Text | Regex | DB_Column -> Text | DB_Column -> Case_Sensitivity -> Boolean -> DB_Column ! Unsupported_Database_Operation
-    text_replace self (term : Text | Regex | DB_Column = "") new_text="" case_sensitivity=Case_Sensitivity.Default only_first=False =
+    text_replace self (term : Text | Regex | DB_Column = "") new_text="" case_sensitivity:Case_Sensitivity=..Default only_first=False =
         Value_Type.expect_text self <| case_sensitivity.disallow_non_default_locale <|
             input_type = Meta.type_of term
             params = Replace_Params.Value input_type case_sensitivity only_first
@@ -1594,7 +1610,7 @@ type DB_Column
        Returns a column of `Integer` type.
     @period Date_Time_Helpers.make_period_selector_for_column
     date_part : Date_Period | Time_Period -> DB_Column ! Invalid_Value_Type | Illegal_Argument
-    date_part self period =
+    date_part self period:(Date_Period | Time_Period) =
         Date_Time_Helpers.make_date_part_function self period (column->op_name-> column.make_unary_op op_name) self.naming_helper
 
     ## GROUP Standard.Base.DateTime
@@ -1763,7 +1779,7 @@ type DB_Column
     @locale Locale.default_widget
     @format (self-> Widget_Helpers.make_format_chooser_for_type self.value_type)
     format : Text | Date_Time_Formatter | DB_Column -> Locale -> DB_Column ! Illegal_Argument
-    format self format:(Text | Date_Time_Formatter | DB_Column)="" locale=Locale.default =
+    format self format:(Text | Date_Time_Formatter | DB_Column)="" locale:Locale=Locale.default =
         _ = [format, locale]
         Error.throw <| Unsupported_Database_Operation.Error "`DB_Column.format` is not implemented yet for the Database backends."
 
@@ -1816,7 +1832,7 @@ type DB_Column
          types. Due to this, a Mixed column containing values `[2, "3"]` will
          actually be converted into `[2, Nothing]` when casting to Integer type.
     cast : Value_Type -> Problem_Behavior -> DB_Column ! Illegal_Argument | Inexact_Type_Coercion | Conversion_Failure
-    cast self value_type on_problems:Problem_Behavior=..Report_Warning =
+    cast self value_type:Value_Type on_problems:Problem_Behavior=..Report_Warning =
         check_cast_compatibility self.value_type value_type <|
             self.internal_do_cast value_type on_problems
 
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/DB_Table.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/DB_Table.enso
index aa9fccdbed4..c179c898ba9 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/DB_Table.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/DB_Table.enso
@@ -1045,7 +1045,10 @@ type DB_Table
     evaluate_expression : Text | Expression -> Problem_Behavior -> DB_Column ! No_Such_Column | Invalid_Value_Type | Expression_Error
     evaluate_expression self expression:(Text | Expression) on_problems:Problem_Behavior=..Report_Warning = if expression.is_a Text then self.evaluate_expression (Expression.Value expression) on_problems else
         get_column name = self.at name
-        new_column = Expression.evaluate expression get_column self.make_constant_column "Standard.Database.DB_Column" "DB_Column" DB_Column.var_args_functions
+        make_constant_column value = case value of
+            _ : DB_Column -> value
+            _ -> self.make_constant_column value
+        new_column = Expression.evaluate expression get_column make_constant_column "Standard.Database.DB_Column" "DB_Column" DB_Column.var_args_functions
         problems = Warning.get_all new_column . map .value
         result = new_column.rename (self.connection.base_connection.column_naming_helper.sanitize_name expression.expression)
         on_problems.attach_problems_before problems <|
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Dialect.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Dialect.enso
index 4e3cc00d1e8..811f0e56051 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Dialect.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Dialect.enso
@@ -288,10 +288,10 @@ default_fetch_primary_key connection table_name =
 
 ## PRIVATE
 type Temp_Table_Style
-      ## PRIVATE
-         The temporary table is created using a create table statement.
-      Temporary_Table
-      
-      ## PRIVATE
-         The temporary table is created using a # table name.
-      Hash_Prefix
+    ## PRIVATE
+       The temporary table is created using a create table statement.
+    Temporary_Table
+
+    ## PRIVATE
+       The temporary table is created using a # table name.
+    Hash_Prefix
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Base_Generator.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Base_Generator.enso
index 781278c5aa9..f562635e03d 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Base_Generator.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Base_Generator.enso
@@ -11,8 +11,8 @@ import project.Internal.IR.Query.Query
 import project.Internal.IR.SQL_Expression.SQL_Expression
 import project.Internal.IR.SQL_Join_Kind.SQL_Join_Kind
 import project.SQL.SQL_Builder
-from project.Errors import Unsupported_Database_Operation
 from project.Dialect import Temp_Table_Style
+from project.Errors import Unsupported_Database_Operation
 from project.Internal.IR.Operation_Metadata import Row_Number_Metadata
 
 type Dialect_Operations
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/DDL_Transaction.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/DDL_Transaction.enso
index d0e24e0c8c6..024952786c5 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/DDL_Transaction.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/DDL_Transaction.enso
@@ -38,7 +38,9 @@ type Support_Level
                     if metadata.dataDefinitionCausesTransactionCommit then Support_Level.Causes_Commit else
                         Support_Level.Allowed
 
+## PRIVATE
 type Transactional_Table_Description
+    ## PRIVATE
     Value name:Text temporary:Boolean (structure : Vector Column_Description) (primary_key : Vector Text | Nothing) (remove_after_transaction:Boolean) (on_problems:Problem_Behavior)
 
     ## PRIVATE
@@ -107,9 +109,11 @@ private create_tables_outside_transaction connection (tables : Vector Transactio
             cleanup_transaction_scoped_tables connection tables
         cleanup_errors.if_not_error result
 
+## PRIVATE
 private cleanup_tables_silently connection table_names = Context.Output.with_enabled <|
     table_names.each (name-> connection.drop_table name if_exists=True . catch)
 
+## PRIVATE
 private cleanup_transaction_scoped_tables connection tables = Context.Output.with_enabled <|
     tables.each (t-> if t.remove_after_transaction then connection.drop_table t.name if_exists=True)
 
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Postgres/Postgres_Dialect.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Postgres/Postgres_Dialect.enso
index 4835dfaa2dd..565210289ed 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Postgres/Postgres_Dialect.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Postgres/Postgres_Dialect.enso
@@ -37,8 +37,8 @@ import project.SQL.SQL_Builder
 import project.SQL.SQL_Fragment
 import project.SQL_Statement.SQL_Statement
 import project.SQL_Type.SQL_Type
-from project.Errors import SQL_Error, Unsupported_Database_Operation
 from project.Dialect import Temp_Table_Style
+from project.Errors import SQL_Error, Unsupported_Database_Operation
 from project.Internal.IR.Operation_Metadata import Date_Period_Metadata
 
 polyglot java import java.sql.Types
@@ -667,8 +667,6 @@ make_date_add arguments (metadata : Date_Period_Metadata) =
                 "weeks=>1"
             Date_Period.Day ->
                 "days=>1"
-            Time_Period.Day ->
-                "hours=>24"
             Time_Period.Hour ->
                 "hours=>1"
             Time_Period.Minute ->
@@ -734,10 +732,6 @@ make_date_diff arguments (metadata : Date_Period_Metadata) =
             Time_Period.Hour    -> (extract_seconds ++ " / 3600").paren
             Time_Period.Minute  -> (extract_seconds ++ " / 60").paren
             Time_Period.Second  -> extract_seconds
-            Time_Period.Day     -> case metadata.input_value_type of
-                Value_Type.Date -> extract_days
-                # Time_Period.Day is treated as 24 hours, so for types that support time we use the same algorithm like for hours, but divide by 24.
-                _ -> (extract_seconds ++ " / (3600 * 24)").paren
             ## The EPOCH gives back just the integer amount of seconds, without
                the fractional part. So we get the fractional part using
                MILLISECONDS - but that does not give the _total_ just the
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/SQLite/SQLite_Dialect.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/SQLite/SQLite_Dialect.enso
index 32d70b86f37..66380dcacd2 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/SQLite/SQLite_Dialect.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/SQLite/SQLite_Dialect.enso
@@ -31,8 +31,8 @@ import project.Internal.Statement_Setter.Statement_Setter
 import project.SQL.SQL_Builder
 import project.SQL_Statement.SQL_Statement
 import project.SQL_Type.SQL_Type
-from project.Errors import SQL_Error, Unsupported_Database_Operation
 from project.Dialect import Temp_Table_Style
+from project.Errors import SQL_Error, Unsupported_Database_Operation
 
 ## PRIVATE
 
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Helpers/Prepare_Structure.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Helpers/Prepare_Structure.enso
index 131a869674d..3662c3aada4 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Helpers/Prepare_Structure.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Helpers/Prepare_Structure.enso
@@ -7,8 +7,8 @@ import Standard.Base.Errors.Illegal_State.Illegal_State
 import Standard.Table.Internal.Problem_Builder.Problem_Builder
 from Standard.Table import Table
 
-import project.Connection.Connection.Connection
 import project.Column_Description.Column_Description
+import project.Connection.Connection.Connection
 import project.DB_Table.DB_Table
 
 ## PRIVATE
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Delete.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Delete.enso
index 04fd9f7e53b..04cafb10dbd 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Delete.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Delete.enso
@@ -14,7 +14,7 @@ from project.Errors import SQL_Error
 from project.Internal.Upload.Helpers.Argument_Checks import check_delete_rows_arguments
 from project.Internal.Upload.Helpers.Check_Queries import check_duplicate_key_matches_for_delete, check_for_null_keys
 from project.Internal.Upload.Helpers.Constants import dry_run_row_limit
-from project.Internal.Upload.Operations.Internal_Core import Table_Upload_Operation, internal_upload_in_memory_table, internal_upload_table
+from project.Internal.Upload.Operations.Internal_Core import internal_upload_in_memory_table, internal_upload_table, Table_Upload_Operation
 
 ## PRIVATE
 common_delete_rows (target_table : DB_Table) (key_values_to_delete : Table | DB_Table) (key_columns : Vector Text) (allow_duplicate_matches : Boolean) -> Integer =
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Internal_Core.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Internal_Core.enso
index 1a04b916ff4..1e5837cc780 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Internal_Core.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Internal_Core.enso
@@ -13,8 +13,8 @@ import project.Internal.DDL_Transaction.Transactional_Table_Description
 import project.Internal.In_Transaction.In_Transaction
 import project.Internal.IR.Query.Query
 import project.SQL_Query.SQL_Query
-from project.Errors import SQL_Error, Table_Already_Exists, Unsupported_Database_Operation
 from project.Dialect import Temp_Table_Style
+from project.Errors import SQL_Error, Table_Already_Exists, Unsupported_Database_Operation
 from project.Internal.Upload.Helpers.Argument_Checks import resolve_primary_key
 from project.Internal.Upload.Helpers.Constants import default_batch_size
 from project.Internal.Upload.Helpers.Error_Helpers import handle_upload_errors, internal_translate_known_upload_errors
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Update.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Update.enso
index d2d77906f8c..5b71ef492f1 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Update.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/Internal/Upload/Operations/Update.enso
@@ -13,9 +13,9 @@ import project.Internal.DDL_Transaction
 import project.Internal.In_Transaction.In_Transaction
 import project.Internal.IR.Query.Query
 import project.Update_Action.Update_Action
-from project.Errors import SQL_Error, Rows_Already_Present, Unmatched_Rows
+from project.Errors import Rows_Already_Present, SQL_Error, Unmatched_Rows
 from project.Internal.Upload.Helpers.Argument_Checks import all
-from project.Internal.Upload.Helpers.Check_Queries import check_multiple_rows_match, check_for_null_keys_if_any_keys_set
+from project.Internal.Upload.Helpers.Check_Queries import check_for_null_keys_if_any_keys_set, check_multiple_rows_match
 from project.Internal.Upload.Helpers.Constants import dry_run_row_limit
 from project.Internal.Upload.Helpers.Error_Helpers import handle_upload_errors
 from project.Internal.Upload.Operations.Internal_Core import internal_upload_table
diff --git a/distribution/lib/Standard/Database/0.0.0-dev/src/SQL_Query.enso b/distribution/lib/Standard/Database/0.0.0-dev/src/SQL_Query.enso
index 2c40f1783d0..e6f6f69b278 100644
--- a/distribution/lib/Standard/Database/0.0.0-dev/src/SQL_Query.enso
+++ b/distribution/lib/Standard/Database/0.0.0-dev/src/SQL_Query.enso
@@ -1,5 +1,5 @@
-from Standard.Base import Text
 import Standard.Base.Errors.Common.Missing_Argument
+from Standard.Base import Text
 
 type SQL_Query
     ## Query a whole table or view.
diff --git a/distribution/lib/Standard/Microsoft/0.0.0-dev/src/Internal/SQLServer_Dialect.enso b/distribution/lib/Standard/Microsoft/0.0.0-dev/src/Internal/SQLServer_Dialect.enso
index 9338cbf63ff..a55a0ee6784 100644
--- a/distribution/lib/Standard/Microsoft/0.0.0-dev/src/Internal/SQLServer_Dialect.enso
+++ b/distribution/lib/Standard/Microsoft/0.0.0-dev/src/Internal/SQLServer_Dialect.enso
@@ -38,8 +38,8 @@ import Standard.Database.SQL.SQL_Builder
 import Standard.Database.SQL.SQL_Fragment
 import Standard.Database.SQL_Statement.SQL_Statement
 import Standard.Database.SQL_Type.SQL_Type
-from Standard.Database.Errors import SQL_Error, Unsupported_Database_Operation
 from Standard.Database.Dialect import Temp_Table_Style
+from Standard.Database.Errors import SQL_Error, Unsupported_Database_Operation
 from Standard.Database.Internal.IR.Operation_Metadata import Date_Period_Metadata
 from Standard.Database.Internal.Statement_Setter import fill_hole_default
 
@@ -193,7 +193,7 @@ type SQLSever_Dialect
        Specifies how the database creates temp tables.
     temp_table_style : Temp_Table_Style
     temp_table_style self = Temp_Table_Style.Hash_Prefix
-    
+
     ## PRIVATE
     adapt_unified_column : Internal_Column -> Value_Type -> (SQL_Expression -> SQL_Type_Reference) -> Internal_Column
     adapt_unified_column self column approximate_result_type infer_result_type_from_database_callback =
@@ -565,8 +565,6 @@ make_date_add arguments (metadata : Date_Period_Metadata) =
                 "weeks=>1"
             Date_Period.Day ->
                 "days=>1"
-            Time_Period.Day ->
-                "hours=>24"
             Time_Period.Hour ->
                 "hours=>1"
             Time_Period.Minute ->
@@ -630,10 +628,6 @@ make_date_diff arguments (metadata : Date_Period_Metadata) =
             Time_Period.Hour    -> (extract_seconds ++ " / 3600").paren
             Time_Period.Minute  -> (extract_seconds ++ " / 60").paren
             Time_Period.Second  -> extract_seconds
-            Time_Period.Day     -> case metadata.input_value_type of
-                Value_Type.Date -> extract_days
-                # Time_Period.Day is treated as 24 hours, so for types that support time we use the same algorithm like for hours, but divide by 24.
-                _ -> (extract_seconds ++ " / (3600 * 24)").paren
             ## The EPOCH gives back just the integer amount of seconds, without
                the fractional part. So we get the fractional part using
                MILLISECONDS - but that does not give the _total_ just the
diff --git a/distribution/lib/Standard/Snowflake/0.0.0-dev/src/Internal/Snowflake_Dialect.enso b/distribution/lib/Standard/Snowflake/0.0.0-dev/src/Internal/Snowflake_Dialect.enso
index 17aa7283b4d..8fa7655493e 100644
--- a/distribution/lib/Standard/Snowflake/0.0.0-dev/src/Internal/Snowflake_Dialect.enso
+++ b/distribution/lib/Standard/Snowflake/0.0.0-dev/src/Internal/Snowflake_Dialect.enso
@@ -39,8 +39,8 @@ import Standard.Database.SQL.SQL_Builder
 import Standard.Database.SQL.SQL_Fragment
 import Standard.Database.SQL_Statement.SQL_Statement
 import Standard.Database.SQL_Type.SQL_Type
-from Standard.Database.Errors import SQL_Error, Unsupported_Database_Operation
 from Standard.Database.Dialect import Temp_Table_Style
+from Standard.Database.Errors import SQL_Error, Unsupported_Database_Operation
 from Standard.Database.Internal.IR.Operation_Metadata import Date_Period_Metadata
 from Standard.Database.Internal.Statement_Setter import fill_hole_default
 
@@ -616,7 +616,6 @@ date_period_to_part_with_multiplier period =
         Date_Period.Month   -> ["month", 1]
         Date_Period.Week _  -> ["week", 1]
         Date_Period.Day     -> ["day", 1]
-        Time_Period.Day     -> ["hour", 24]
         Time_Period.Hour    -> ["hour", 1]
         Time_Period.Minute  -> ["minute", 1]
         Time_Period.Second  -> ["second", 1]
diff --git a/distribution/lib/Standard/Table/0.0.0-dev/src/Column.enso b/distribution/lib/Standard/Table/0.0.0-dev/src/Column.enso
index cd090649e23..7172dc125c3 100644
--- a/distribution/lib/Standard/Table/0.0.0-dev/src/Column.enso
+++ b/distribution/lib/Standard/Table/0.0.0-dev/src/Column.enso
@@ -240,7 +240,7 @@ type Column
        `other`.
     @locale Locale.default_widget
     equals_ignore_case : Column | Any -> Locale -> Column
-    equals_ignore_case self other locale=Locale.default =
+    equals_ignore_case self other locale:Locale=Locale.default =
         ## TODO currently this always runs the fallback which is slow due to the
            cost of Java-to-Enso calls. We want to have a vectorized
            implementation, but we need to extend the architecture to allow
@@ -1244,7 +1244,7 @@ type Column
 
              example_starts_with = Examples.text_column_1.starts_with "hell" Case_Sensitivity.Insensitive
     starts_with : Column | Text -> Case_Sensitivity -> Column
-    starts_with self other case_sensitivity=Case_Sensitivity.Default =
+    starts_with self other case_sensitivity:Case_Sensitivity=..Default =
         new_name = naming_helper.function_name "starts_with" [self, other]
         run_vectorized_binary_case_text_op self Java_Storage.Maps.STARTS_WITH other case_sensitivity (a -> b -> a.starts_with b case_sensitivity) new_name
 
@@ -1275,7 +1275,7 @@ type Column
 
              example_ends_with = Examples.text_column_1.ends_with "hell"
     ends_with : Column | Text -> Case_Sensitivity -> Column
-    ends_with self other case_sensitivity=Case_Sensitivity.Default =
+    ends_with self other case_sensitivity:Case_Sensitivity=..Default =
         new_name = naming_helper.function_name "ends_with" [self, other]
         run_vectorized_binary_case_text_op self Java_Storage.Maps.ENDS_WITH other case_sensitivity (a -> b -> a.ends_with b case_sensitivity) new_name
 
@@ -1367,7 +1367,7 @@ type Column
 
              example_contains = Examples.text_column_1.contains "hell"
     contains : Column | Text -> Case_Sensitivity -> Column
-    contains self other case_sensitivity=Case_Sensitivity.Default =
+    contains self other case_sensitivity:Case_Sensitivity=..Default =
         new_name = naming_helper.function_name "contains" [self, other]
         run_vectorized_binary_case_text_op self Java_Storage.Maps.CONTAINS other case_sensitivity (a -> b -> a.contains b case_sensitivity) new_name
 
@@ -1450,7 +1450,7 @@ type Column
              column.text_replace '"(.*?)"'.to_regex '($1)'
     @term make_regex_text_widget
     text_replace : Text | Regex | Column -> Text | Column -> Case_Sensitivity -> Boolean -> Column
-    text_replace self (term : Text | Regex | Column = "") new_text="" case_sensitivity=Case_Sensitivity.Sensitive only_first=False =
+    text_replace self (term : Text | Regex | Column = "") new_text="" case_sensitivity:Case_Sensitivity=..Sensitive only_first=False =
         Value_Type.expect_text self <|
             term_fn = wrap_text_or_regex_argument_as_value_provider term
             new_text_fn = wrap_text_argument_as_value_provider new_text
@@ -1596,7 +1596,7 @@ type Column
        Returns a column of `Integer` type.
     @period Date_Time_Helpers.make_period_selector_for_column
     date_part : Date_Period | Time_Period -> Column ! Invalid_Value_Type | Illegal_Argument
-    date_part self period =
+    date_part self period:(Date_Period | Time_Period)=..Day =
         date_part_operation col name =
             operation = case name of
                 DatePartOperation.YEAR -> DatePartOperation.YEAR_INSTANCE
@@ -1639,7 +1639,7 @@ type Column
          unusual events like DST.
     @period Date_Time_Helpers.make_period_selector_for_column
     date_diff : (Column | Date | Date_Time | Time_Of_Day) -> Date_Period | Time_Period -> Column ! Invalid_Value_Type | Illegal_Argument
-    date_diff self end (period : Date_Period | Time_Period = Date_Period.Day) =
+    date_diff self end (period : Date_Period | Time_Period = ..Day) =
         Value_Type.expect_type self .is_date_or_time "date/time" <|
             my_type = self.inferred_precise_value_type
             Value_Type.expect_type end (== my_type) my_type.to_display_text <|
@@ -1900,7 +1900,7 @@ type Column
     @locale Locale.default_widget
     @format (self-> Widget_Helpers.make_format_chooser_for_type self.value_type)
     format : Text | Date_Time_Formatter | Column -> Locale -> Column ! Illegal_Argument
-    format self format:(Text | Date_Time_Formatter | Column)="" locale=Locale.default = case format of
+    format self format:(Text | Date_Time_Formatter | Column)="" locale:Locale=Locale.default = case format of
         format_column : Column -> Value_Type.expect_text format_column <|
             formatter = make_value_formatter_for_value_type self.value_type locale
             formatter.if_not_error <|
@@ -1959,7 +1959,7 @@ type Column
          types. Due to this, a Mixed column containing values `[2, "3"]` will
          actually be converted into `[2, Nothing]` when casting to Integer type.
     cast : Value_Type -> Problem_Behavior -> Column ! Illegal_Argument | Inexact_Type_Coercion | Conversion_Failure
-    cast self value_type on_problems:Problem_Behavior=..Report_Warning =
+    cast self value_type:Value_Type on_problems:Problem_Behavior=..Report_Warning =
         Cast_Helpers.check_cast_compatibility self.value_type value_type <|
             target_storage_type = Storage.from_value_type value_type on_problems
             Java_Problems.with_problem_aggregator on_problems java_problem_aggregator->
@@ -2377,7 +2377,7 @@ type Column
                  my_compare a b = Ordering.compare a.abs b.abs
                  Examples.decimal_column.sort by=my_compare
     sort : Sort_Direction -> Boolean -> (Any -> Any -> Ordering) | Nothing -> Column
-    sort self order=Sort_Direction.Ascending missing_last=True by=Nothing = case by of
+    sort self order:Sort_Direction=..Ascending missing_last:Boolean=True by=Nothing = case by of
         Nothing ->
             order_bool = case order of
                 Sort_Direction.Ascending -> True
diff --git a/distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Date_Time_Helpers.enso b/distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Date_Time_Helpers.enso
index d3d3b80f710..fd5be093fc4 100644
--- a/distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Date_Time_Helpers.enso
+++ b/distribution/lib/Standard/Table/0.0.0-dev/src/Internal/Date_Time_Helpers.enso
@@ -12,18 +12,10 @@ import project.Value_Type.Value_Type
 align_period_with_value_type value_type (period : Date_Period | Time_Period) = case value_type of
     Value_Type.Date ->
         if period.is_a Date_Period then period else
-            ## We don't 'officially' allow `Time_Period` for Date, but since
-               `Time_Period.Day` and `Date_Period.Day` in this context can be interchangeable,
-               we allow it as an exception - we just swap it to be the right type.
-            if period == Time_Period.Day then Date_Period.Day else
-                Error.throw (Illegal_Argument.Error "`Time_Period` is not allowed for Date columns. Use `Date_Period`.")
+            Error.throw (Illegal_Argument.Error "`Time_Period` is not allowed for Date columns. Use `Date_Period`.")
     Value_Type.Time ->
-        case period of
-            _ : Date_Period ->
-                Error.throw (Illegal_Argument.Error "`Date_Period` is not allowed for Time columns. Use `Time_Period`.")
-            Time_Period.Day ->
-                Error.throw (Illegal_Argument.Error "`Time_Period.Day` does not make sense for Time columns.")
-            _ -> period
+        if period.is_a Time_Period then period else
+            Error.throw (Illegal_Argument.Error "`Date_Period` is not allowed for Time columns. Use `Time_Period`.")
     Value_Type.Date_Time _ ->
         ## Both kinds are allowed for `Date_Time` columns, return them as-is.
         period
@@ -41,7 +33,6 @@ make_date_part_function column period make_unary_op naming_helper =
                 Date_Period.Month -> make_unary_op column "month"
                 Date_Period.Week _ -> make_unary_op column "week"
                 Date_Period.Day -> make_unary_op column "day"
-                Time_Period.Day -> make_unary_op column "day"
                 Time_Period.Hour -> make_unary_op column "hour"
                 Time_Period.Minute -> make_unary_op column "minute"
                 Time_Period.Second -> make_unary_op column "second"
diff --git a/distribution/lib/Standard/Table/0.0.0-dev/src/Table.enso b/distribution/lib/Standard/Table/0.0.0-dev/src/Table.enso
index f4162fb1ff3..8f85b09a889 100644
--- a/distribution/lib/Standard/Table/0.0.0-dev/src/Table.enso
+++ b/distribution/lib/Standard/Table/0.0.0-dev/src/Table.enso
@@ -1894,7 +1894,10 @@ type Table
     evaluate_expression : Text | Expression -> Problem_Behavior -> Column ! No_Such_Column | Invalid_Value_Type | Expression_Error
     evaluate_expression self expression:(Text | Expression) on_problems:Problem_Behavior=..Report_Warning = if expression.is_a Text then self.evaluate_expression (Expression.Value expression) on_problems else
         get_column name = self.at name
-        new_column = Expression.evaluate expression get_column self.make_constant_column "Standard.Table.Column" "Column" Column.var_args_functions
+        make_constant_column value = case value of
+            _ : Column -> value
+            _ -> self.make_constant_column value
+        new_column = Expression.evaluate expression get_column make_constant_column "Standard.Table.Column" "Column" Column.var_args_functions
         problems = Warning.get_all new_column . map .value
         result = new_column.rename (self.column_naming_helper.sanitize_name expression.expression)
         on_problems.attach_problems_before problems <|
diff --git a/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Column.enso b/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Column.enso
index 7a9cc0608ae..ad86b9bfbdc 100644
--- a/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Column.enso
+++ b/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Column.enso
@@ -4,6 +4,7 @@ from Standard.Table import Value_Type
 
 ## An Enso representation of a Column in a Tableau Hyper Table.
 type Hyper_Column
+    ## PRIVATE
     Value name:Text value_type:Value_Type nullable:Boolean
 
     ## PRIVATE
diff --git a/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Errors.enso b/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Errors.enso
index be2ca9783c2..e62d45d367b 100644
--- a/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Errors.enso
+++ b/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Errors.enso
@@ -4,15 +4,17 @@ polyglot java import org.enso.tableau.HyperQueryError
 polyglot java import org.enso.tableau.HyperTableNotFound
 
 ## Error when a Table is not found in a Hyper File.
-type Table_Not_Found
+type Hyper_Table_Not_Found
+    ## PRIVATE
     Error schema:Text name:Text
 
 ## Error when a query fails.
 type Query_Failed
+    ## PRIVATE
     Error message:Text query:Text
 
 ## PRIVATE
 private handle_java_exceptions ~action =
-    Panic.catch HyperTableNotFound handler=(c-> Error.throw (Table_Not_Found.Error c.payload.getSchema c.payload.getName)) <|
+    Panic.catch HyperTableNotFound handler=(c-> Error.throw (Hyper_Table_Not_Found.Error c.payload.getSchema c.payload.getName)) <|
         Panic.catch HyperQueryError handler=(c-> Error.throw (Query_Failed.Error c.payload.getMessage c.payload.getQuery)) <|
             action
diff --git a/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_File.enso b/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_File.enso
index cdf213aefac..012f8922560 100644
--- a/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_File.enso
+++ b/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_File.enso
@@ -4,11 +4,11 @@ import Standard.Base.Errors.Illegal_Argument.Illegal_Argument
 from Standard.Base.Metadata.Choice import Option
 from Standard.Base.Metadata.Widget import Single_Choice
 
-from Standard.Table import Table
 import Standard.Table.Rows_To_Read.Rows_To_Read
+from Standard.Table import Table
 
+import project.Hyper_Errors.Hyper_Table_Not_Found
 import project.Hyper_Table.Hyper_Table
-import project.Hyper_Errors.Table_Not_Found
 
 polyglot java import org.enso.tableau.HyperReader
 
@@ -66,7 +66,7 @@ type Hyper_File
                 _ -> HyperReader.listTables self.file.path schema
             array.map t-> Hyper_Table.Value self t.schema t.name
 
-    ## ALIAS sheet, get
+    ## ALIAS get, sheet
        GROUP Standard.Base.Input
        ICON data_input
        Read a table from the Hyper_File into a Table.
@@ -83,7 +83,7 @@ type Hyper_File
         "" -> self.read table self.schema limit
         "*" ->
             table_to_read = self.tables.find if_missing=Nothing t-> t.table == table
-            if table_to_read.is_nothing then Error.throw (Table_Not_Found.Error "*" table) else
+            if table_to_read.is_nothing then Error.throw (Hyper_Table_Not_Found.Error "*" table) else
                 table_to_read.read limit
         _ -> Hyper_Table.Value self table schema . read limit
 
diff --git a/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Table.enso b/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Table.enso
index cc6157150a4..fff25bdf132 100644
--- a/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Table.enso
+++ b/distribution/lib/Standard/Tableau/0.0.0-dev/src/Hyper_Table.enso
@@ -1,13 +1,13 @@
 from Standard.Base import all
 import Standard.Base.Errors.File_Error.File_Error
 
-from Standard.Table import Column, Table, Value_Type
-import Standard.Table.Rows_To_Read.Rows_To_Read
 import Standard.Table.Internal.Java_Problems
+import Standard.Table.Rows_To_Read.Rows_To_Read
+from Standard.Table import Column, Table, Value_Type
 
 import project.Hyper_Column.Hyper_Column
-import project.Hyper_File.Hyper_File
 import project.Hyper_Errors
+import project.Hyper_File.Hyper_File
 
 polyglot java import java.sql.Types
 polyglot java import org.enso.tableau.HyperReader
diff --git a/distribution/lib/Standard/Test/0.0.0-dev/src/Main.enso b/distribution/lib/Standard/Test/0.0.0-dev/src/Main.enso
index 90a7cf39c2a..0b2e84fed6f 100644
--- a/distribution/lib/Standard/Test/0.0.0-dev/src/Main.enso
+++ b/distribution/lib/Standard/Test/0.0.0-dev/src/Main.enso
@@ -13,9 +13,9 @@ export project.Extensions.should_be_a
 export project.Extensions.should_be_false
 export project.Extensions.should_be_true
 export project.Extensions.should_contain
-export project.Extensions.should_equal_ignoring_order
 export project.Extensions.should_end_with
 export project.Extensions.should_equal
+export project.Extensions.should_equal_ignoring_order
 export project.Extensions.should_equal_type
 export project.Extensions.should_fail_with
 export project.Extensions.should_not_contain
diff --git a/engine/runtime-integration-tests/src/test/java/org/enso/interpreter/test/ValuesGenerator.java b/engine/runtime-integration-tests/src/test/java/org/enso/interpreter/test/ValuesGenerator.java
index 1c41d6ddff5..a0897f13bea 100644
--- a/engine/runtime-integration-tests/src/test/java/org/enso/interpreter/test/ValuesGenerator.java
+++ b/engine/runtime-integration-tests/src/test/java/org/enso/interpreter/test/ValuesGenerator.java
@@ -507,7 +507,7 @@ public final class ValuesGenerator {
           v(null, "import Standard.Base.Data.Time.Date_Period.Date_Period", "Date_Period.Year")
               .type());
       collect.add(
-          v(null, "import Standard.Base.Data.Time.Time_Period.Time_Period", "Time_Period.Day")
+          v(null, "import Standard.Base.Data.Time.Time_Period.Time_Period", "Time_Period.Hour")
               .type());
       collect.add(
           v(null, "import Standard.Base.Data.Time.Period.Period", "Period.new 1 2 3").type());
diff --git a/std-bits/table/src/main/antlr4/Expression.g4 b/std-bits/table/src/main/antlr4/Expression.g4
index 825996d8845..4e0345ee61e 100644
--- a/std-bits/table/src/main/antlr4/Expression.g4
+++ b/std-bits/table/src/main/antlr4/Expression.g4
@@ -17,6 +17,7 @@ expr:   expr op=POWER expr                                # Power
     |   '(' expr ')'                                      # Paren
     |   COLUMN_NAME                                       # Column
     |   MINUS expr                                        # UnaryMinus
+    |   '..' IDENTIFIER                                   # Atom
     |   value                                             # Literal
     ;
 
diff --git a/std-bits/table/src/main/java/org/enso/table/expressions/ExpressionVisitorImpl.java b/std-bits/table/src/main/java/org/enso/table/expressions/ExpressionVisitorImpl.java
index 63ae77c4342..938790fa2cc 100644
--- a/std-bits/table/src/main/java/org/enso/table/expressions/ExpressionVisitorImpl.java
+++ b/std-bits/table/src/main/java/org/enso/table/expressions/ExpressionVisitorImpl.java
@@ -82,6 +82,7 @@ public class ExpressionVisitorImpl extends ExpressionBaseVisitor<Value> {
   private final Function<String, Value> getColumn;
   private final Function<Object, Value> makeConstantColumn;
   private final Function<String, Value> getMethod;
+  private final Function<String, Value> makeConstructor;
   private final Set<String> variableArgumentFunctions;
 
   private ExpressionVisitorImpl(
@@ -93,10 +94,11 @@ public class ExpressionVisitorImpl extends ExpressionBaseVisitor<Value> {
     this.getColumn = getColumn;
     this.makeConstantColumn = makeConstantColumn;
 
-    final Value module =
-        Context.getCurrent().getBindings("enso").invokeMember("get_module", moduleName);
+    var context = Context.getCurrent().getBindings("enso");
+    final Value module = context.invokeMember("get_module", moduleName);
     final Value type = module.invokeMember("get_type", typeName);
-    this.getMethod = name -> module.invokeMember("get_method", type, name);
+    getMethod = name -> module.invokeMember("get_method", type, name);
+    makeConstructor = name -> module.invokeMember("eval_expression", ".." + name);
 
     this.variableArgumentFunctions = new HashSet<>(Arrays.asList(variableArgumentFunctions));
   }
@@ -135,7 +137,7 @@ public class ExpressionVisitorImpl extends ExpressionBaseVisitor<Value> {
       if (result.canExecute()) {
         throw new IllegalArgumentException("Insufficient arguments for method " + name + ".");
       }
-      return result;
+      return makeConstantColumn.apply(result);
     } catch (PolyglotException e) {
       if (e.getMessage().startsWith("Type error: expected a function")) {
         throw new IllegalArgumentException("Too many arguments for method " + name + ".");
@@ -224,6 +226,29 @@ public class ExpressionVisitorImpl extends ExpressionBaseVisitor<Value> {
     return executeMethod("*", visit(ctx.expr()), Value.asValue(-1));
   }
 
+  @Override
+  public Value visitAtom(ExpressionParser.AtomContext ctx) {
+    var atomName = ctx.IDENTIFIER().getText();
+    return makeConstructor.apply(toCamelCase(atomName));
+  }
+
+  private static String toCamelCase(String name) {
+    var builder = new StringBuilder(name.length());
+    boolean convertNext = true;
+    for (var c : name.toCharArray()) {
+      if (convertNext) {
+        builder.append(Character.toUpperCase(c));
+        convertNext = c == '_';
+      } else if (c == '_') {
+        convertNext = true;
+        builder.append(c);
+      } else {
+        builder.append(Character.toLowerCase(c));
+      }
+    }
+    return builder.toString();
+  }
+
   @Override
   public Value visitNullOrNothing(ExpressionParser.NullOrNothingContext ctx) {
     return Value.asValue(null);
diff --git a/test/Base_Tests/src/Data/Time/Date_Spec.enso b/test/Base_Tests/src/Data/Time/Date_Spec.enso
index e0d851c9320..062f37ea256 100644
--- a/test/Base_Tests/src/Data/Time/Date_Spec.enso
+++ b/test/Base_Tests/src/Data/Time/Date_Spec.enso
@@ -476,7 +476,7 @@ spec_with suite_builder name create_new_date parse_date pending=Nothing =
             d1.date_part Date_Period.Week . should_equal 52
             d1.date_part Date_Period.Day . should_equal 30
 
-            Test.expect_panic_with (d1.date_part Time_Period.Day) Type_Error
+            Test.expect_panic_with (d1.date_part Time_Period.Hour) Type_Error
 
         group_builder.specify "should allow computing date_diff" <|
             d1 = create_new_date 2021 11 3
@@ -505,7 +505,6 @@ spec_with suite_builder name create_new_date parse_date pending=Nothing =
             d3.date_diff (Date.new 2021 03 01) Date_Period.Day . should_equal 58
             d3.date_diff (Date.new 2021 03 01) Date_Period.Month . should_equal 1
 
-            Test.expect_panic_with (d1.date_diff d2 Time_Period.Day) Type_Error
             Test.expect_panic_with (d1.date_diff d2 Time_Period.Hour) Type_Error
 
         group_builder.specify "should allow shifting with date_add" <|
@@ -521,7 +520,6 @@ spec_with suite_builder name create_new_date parse_date pending=Nothing =
             d1.date_add 2 Date_Period.Quarter . should_equal (Date.new 2021 07 31)
 
             Test.expect_panic_with (d1.date_add 1 Time_Period.Hour) Type_Error
-            Test.expect_panic_with (d1.date_add 1 Time_Period.Day) Type_Error
             Test.expect_panic_with (d1.date_add 1.5 Date_Period.Day) Type_Error
             Test.expect_panic_with (d1.date_add 1.0 Date_Period.Day) Type_Error
 
diff --git a/test/Base_Tests/src/Data/Time/Date_Time_Spec.enso b/test/Base_Tests/src/Data/Time/Date_Time_Spec.enso
index eb6e52592f5..dd54af2e580 100644
--- a/test/Base_Tests/src/Data/Time/Date_Time_Spec.enso
+++ b/test/Base_Tests/src/Data/Time/Date_Time_Spec.enso
@@ -318,7 +318,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
 
         group_builder.specify "should support addition of Time_Period" <|
             time = create_new_datetime 1970 (zone = Time_Zone.utc)
-            time+Time_Period.Day . should_equal <| create_new_datetime 1970 1 2 (zone = Time_Zone.utc)
             time+Time_Period.Hour . should_equal <| create_new_datetime 1970 1 1 1 (zone = Time_Zone.utc)
             time+Time_Period.Minute . should_equal <| create_new_datetime 1970 1 1 0 1 (zone = Time_Zone.utc)
             time+Time_Period.Second . should_equal <| create_new_datetime 1970 1 1 0 0 1 (zone = Time_Zone.utc)
@@ -329,7 +328,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
 
         group_builder.specify "should support subtraction of Time_Period" <|
             time = create_new_datetime 1970 (zone = Time_Zone.utc)
-            time-Time_Period.Day . should_equal <| create_new_datetime 1969 12 31 (zone = Time_Zone.utc)
             time-Time_Period.Hour . should_equal <| create_new_datetime 1969 12 31 23 (zone = Time_Zone.utc)
             time-Time_Period.Minute . should_equal <| create_new_datetime 1969 12 31 23 59 (zone = Time_Zone.utc)
             time-Time_Period.Second . should_equal <| create_new_datetime 1969 12 31 23 59 59 (zone = Time_Zone.utc)
@@ -346,20 +344,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
             time+Date_Period.Year-Time_Period.Minute . should_equal <| create_new_datetime 1970 12 31 23 59 (zone = Time_Zone.utc)
             time+Time_Period.Minute+Time_Period.Minute-Time_Period.Minute . should_equal <| create_new_datetime 1970 1 1 0 1 (zone = Time_Zone.utc)
             time+Date_Period.Quarter-Date_Period.Month . should_equal <| create_new_datetime 1970 3 1 (zone = Time_Zone.utc)
-            time+Date_Period.Day-Time_Period.Day . should_equal <| create_new_datetime 1970 (zone = Time_Zone.utc)
-
-        group_builder.specify "will reflect that Time_Period.Day does not reflect daylight saving" <|
-            tz = Time_Zone.parse "Europe/Warsaw"
-            dt = Date_Time.new 2023 03 26 01 20 zone=tz
-
-            dt1 = dt + Time_Period.Day
-            dt2 = dt + Date_Period.Day
-
-            # Time Period adds 24 hours which will be 1 hour later due to the DST hole.
-            dt1 . should_equal (Date_Time.new 2023 03 27 02 20 zone=tz)
-
-            # Date Period shifts by 1 calendar day.
-            dt2 . should_equal (Date_Time.new 2023 03 27 01 20 zone=tz)
 
         group_builder.specify "should get the default comparator for datetimes" <|
             assert_comparator value comparator =
@@ -482,8 +466,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
 
         group_builder.specify "should allow to find start/end of a Time_Period containing the current datetime" <|
             d1 = create_new_datetime 2022 9 12 15 37 58 123456789
-            d1.start_of Time_Period.Day . should_equal (Date_Time.new 2022 9 12)
-            d1.end_of Time_Period.Day . should_equal (Date_Time.new 2022 9 12 23 59 59 nanosecond=max_nanos)
             d1.start_of Time_Period.Hour . should_equal (Date_Time.new 2022 9 12 15 0 0 0)
             d1.end_of Time_Period.Hour . should_equal (Date_Time.new 2022 9 12 15 59 59 nanosecond=max_nanos)
             d1.start_of Time_Period.Minute . should_equal (Date_Time.new 2022 9 12 15 37 0 0)
@@ -501,8 +483,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
                 d1.end_of Time_Period.Nanosecond . should_equal d1
 
             d2 = create_new_datetime 1970 1 1 0 0 0
-            d2.start_of Time_Period.Day . should_equal (Date_Time.new 1970)
-            d2.end_of Time_Period.Day . should_equal (Date_Time.new 1970 1 1 23 59 59 nanosecond=max_nanos)
             d2.start_of Time_Period.Hour . should_equal (Date_Time.new 1970 1 1 0 0 0 0)
             d2.end_of Time_Period.Hour . should_equal (Date_Time.new 1970 1 1 0 59 59 nanosecond=max_nanos)
             d2.start_of Time_Period.Minute . should_equal (Date_Time.new 1970 1 1 0 0 0 0)
@@ -511,8 +491,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
             d2.end_of Time_Period.Second . should_equal (Date_Time.new 1970 1 1 0 0 0 nanosecond=max_nanos)
 
             d3 = create_new_datetime 2100 12 31 23 59 59 max_nanos
-            d3.start_of Time_Period.Day . should_equal (Date_Time.new 2100 12 31)
-            d3.end_of Time_Period.Day . should_equal (Date_Time.new 2100 12 31 23 59 59 nanosecond=max_nanos)
             d3.start_of Time_Period.Hour . should_equal (Date_Time.new 2100 12 31 23 0 0 0)
             d3.end_of Time_Period.Hour . should_equal (Date_Time.new 2100 12 31 23 59 59 nanosecond=max_nanos)
             d3.start_of Time_Period.Minute . should_equal (Date_Time.new 2100 12 31 23 59 0 0)
@@ -536,8 +514,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
             check_dates_spring date =
                 date.start_of Date_Period.Day . should_equal (Date_Time.new 2022 3 27 zone=tz)
                 date.end_of Date_Period.Day . should_equal (Date_Time.new 2022 3 27 23 59 59 nanosecond=max_nanos zone=tz)
-                date.start_of Time_Period.Day . should_equal (Date_Time.new 2022 3 27 zone=tz)
-                date.end_of Time_Period.Day . should_equal (Date_Time.new 2022 3 27 23 59 59 nanosecond=max_nanos zone=tz)
 
                 date.start_of Date_Period.Month . should_equal (Date_Time.new 2022 3 1 zone=tz)
                 date.end_of Date_Period.Month . should_equal (Date_Time.new 2022 3 31 23 59 59 nanosecond=max_nanos zone=tz)
@@ -575,9 +551,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
             Time_Utils.get_datetime_offset d4 . should_equal offset_1_h
 
             check_dates_autumn date =
-                date.start_of Time_Period.Day . should_equal (Date_Time.new 2022 10 30 zone=tz)
-                date.end_of Time_Period.Day . should_equal (Date_Time.new 2022 10 30 23 59 59 nanosecond=max_nanos zone=tz)
-
                 date.start_of Date_Period.Month . should_equal (Date_Time.new 2022 10 1 zone=tz)
                 date.end_of Date_Period.Month . should_equal (Date_Time.new 2022 10 31 23 59 59 nanosecond=max_nanos zone=tz)
 
@@ -686,7 +659,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
             d1.date_part Date_Period.Month . should_equal 12
             d1.date_part Date_Period.Week . should_equal 52
             d1.date_part Date_Period.Day . should_equal 30
-            d1.date_part Time_Period.Day . should_equal 30
             d1.date_part Time_Period.Hour . should_equal 15
             d1.date_part Time_Period.Minute . should_equal 37
             d1.date_part Time_Period.Second . should_equal 58
@@ -711,8 +683,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
             t1.date_diff t2 Date_Period.Year . should_equal 0
             t1.date_diff (Date_Time.new 2031 12 1 10 15 0) Date_Period.Year . should_equal 10
 
-            t1.date_diff t2 Time_Period.Day . should_equal 32
-
             t1.date_diff t2 Time_Period.Hour . should_equal 770
             t1.date_diff (Date_Time.new 2021 11 3 12 15 0 zone=Time_Zone.utc) Time_Period.Hour . should_equal 2
 
@@ -734,7 +704,6 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
         group_builder.specify "should allow shifting with date_add" <|
             t1 = Date_Time.new 2021 01 01 12 30 0
             t1.date_add 5 Date_Period.Day . should_equal (Date_Time.new 2021 01 06 12 30 0)
-            t1.date_add -1 Time_Period.Day . should_equal (Date_Time.new 2020 12 31 12 30 0)
             t1.date_add 1 Date_Period.Month . should_equal (Date_Time.new 2021 02 01 12 30 0)
             t1.date_add 10 Date_Period.Year . should_equal (Date_Time.new 2031 01 01 12 30 0)
 
@@ -759,21 +728,16 @@ spec_with suite_builder name create_new_datetime parse_datetime nanoseconds_loss
 
             # But 1 day date shift will shift 1 day, keeping the time, even if that particular day is only 23 hours.
             dt1.date_add 1 Date_Period.Day . should_equal (Date_Time.new 2023 03 27 00 30 00 zone=zone)
-            # Time_Period.Day will shift by 24 hours.
-            dt1.date_add 1 Time_Period.Day . should_equal (Date_Time.new 2023 03 27 01 30 00 zone=zone)
 
             dt2 = Date_Time.new 2023 03 27 00 30 00 zone=zone
             dt1.date_diff dt2 Time_Period.Hour . should_equal 23
 
             dt1.date_diff dt2 Date_Period.Day . should_equal 1
-            # But when counting in hours - 23 hours is not a full 24-hour day.
-            dt1.date_diff dt2 Time_Period.Day . should_equal 0
 
             dt3 = Date_Time.new 2023 03 28 01 30 00 zone=zone
             dt4 = Date_Time.new 2023 03 29 00 30 00 zone=zone
 
             dt3.date_diff dt4 Date_Period.Day . should_equal 0
-            dt3.date_diff dt4 Time_Period.Day . should_equal 0
             dt3.date_diff dt4 Time_Period.Hour . should_equal 23
 
     Date_Part_Spec.add_specs suite_builder name create_new_datetime
diff --git a/test/Base_Tests/src/Data/Time/Time_Of_Day_Spec.enso b/test/Base_Tests/src/Data/Time/Time_Of_Day_Spec.enso
index 79e7b4432fb..23cf7ffd8d9 100644
--- a/test/Base_Tests/src/Data/Time/Time_Of_Day_Spec.enso
+++ b/test/Base_Tests/src/Data/Time/Time_Of_Day_Spec.enso
@@ -137,7 +137,6 @@ specWith suite_builder name create_new_time parse_time nanoseconds_loss_in_preci
 
         group_builder.specify "should support addition of Time_Period" <|
             time = create_new_time 0
-            time+Time_Period.Day . should_equal <| create_new_time 0
             time+Time_Period.Hour . should_equal <| create_new_time 1
             time+Time_Period.Minute . should_equal <| create_new_time 0 1
             time+Time_Period.Second . should_equal <| create_new_time 0 0 1
@@ -148,7 +147,6 @@ specWith suite_builder name create_new_time parse_time nanoseconds_loss_in_preci
 
         group_builder.specify "should support subtraction of Time_Period" <|
             time = create_new_time 12
-            time-Time_Period.Day . should_equal <| create_new_time 12
             time-Time_Period.Hour . should_equal <| create_new_time 11
             time-Time_Period.Minute . should_equal <| create_new_time 11 59
             time-Time_Period.Second . should_equal <| create_new_time 11 59 59
@@ -183,8 +181,6 @@ specWith suite_builder name create_new_time parse_time nanoseconds_loss_in_preci
         max_nanos = 999999999
         group_builder.specify "should allow to find start/end of a Time_Period containing the current time of day" <|
             d1 = create_new_time 15 37 58 123456789
-            d1.start_of Time_Period.Day . should_equal (Time_Of_Day.new)
-            d1.end_of Time_Period.Day . should_equal (Time_Of_Day.new 23 59 59 nanosecond=max_nanos)
             d1.start_of Time_Period.Hour . should_equal (Time_Of_Day.new 15 0 0 0)
             d1.end_of Time_Period.Hour . should_equal (Time_Of_Day.new 15 59 59 nanosecond=max_nanos)
             d1.start_of Time_Period.Minute . should_equal (Time_Of_Day.new 15 37 0 0)
@@ -201,8 +197,6 @@ specWith suite_builder name create_new_time parse_time nanoseconds_loss_in_preci
                 d1.end_of Time_Period.Nanosecond . should_equal d1
 
             d2 = create_new_time 0 0 0
-            d2.start_of Time_Period.Day . should_equal (Time_Of_Day.new)
-            d2.end_of Time_Period.Day . should_equal (Time_Of_Day.new 23 59 59 nanosecond=max_nanos)
             d2.start_of Time_Period.Hour . should_equal (Time_Of_Day.new 0 0 0 0)
             d2.end_of Time_Period.Hour . should_equal (Time_Of_Day.new 0 59 59 nanosecond=max_nanos)
             d2.start_of Time_Period.Minute . should_equal (Time_Of_Day.new 0 0 0 0)
@@ -211,8 +205,6 @@ specWith suite_builder name create_new_time parse_time nanoseconds_loss_in_preci
             d2.end_of Time_Period.Second . should_equal (Time_Of_Day.new 0 0 0 nanosecond=max_nanos)
 
             d3 = create_new_time 23 59 59 max_nanos
-            d3.start_of Time_Period.Day . should_equal (Time_Of_Day.new)
-            d3.end_of Time_Period.Day . should_equal (Time_Of_Day.new 23 59 59 nanosecond=max_nanos)
             d3.start_of Time_Period.Hour . should_equal (Time_Of_Day.new 23 0 0 0)
             d3.end_of Time_Period.Hour . should_equal (Time_Of_Day.new 23 59 59 nanosecond=max_nanos)
             d3.start_of Time_Period.Minute . should_equal (Time_Of_Day.new 23 59 0 0)
@@ -230,7 +222,6 @@ specWith suite_builder name create_new_time parse_time nanoseconds_loss_in_preci
                 d1.date_part Time_Period.Microsecond . should_equal 456
                 d1.date_part Time_Period.Nanosecond . should_equal 789
 
-            d1.date_part Time_Period.Day . should_fail_with Illegal_Argument
             Test.expect_panic_with (d1.date_part Date_Period.Day) Type_Error
 
         group_builder.specify "should allow computing a date_diff" <|
@@ -240,7 +231,6 @@ specWith suite_builder name create_new_time parse_time nanoseconds_loss_in_preci
             # There is no default period:
             t1.date_diff t2 . should_be_a Function
             Test.expect_panic_with (t1.date_diff t2 Date_Period.Month) Type_Error
-            t1.date_diff t2 Time_Period.Day . should_fail_with Illegal_Argument
 
             t1.date_diff t2 Time_Period.Hour . should_equal 2
             t1.date_diff (Time_Of_Day.new 9 15 0) Time_Period.Hour . should_equal -1
@@ -275,7 +265,6 @@ specWith suite_builder name create_new_time parse_time nanoseconds_loss_in_preci
                 t1.date_add -2 Time_Period.Nanosecond . should_equal (Time_Of_Day.new 23 44 59 999 999 998)
 
             # No sense to shift Time_Of_Day by days
-            t1.date_add 1 Time_Period.Day . should_fail_with Illegal_Argument
             Test.expect_panic_with (t1.date_add 1 Date_Period.Month) Type_Error
 
             # There is no default period.
diff --git a/test/Table_Tests/src/Common_Table_Operations/Date_Time_Spec.enso b/test/Table_Tests/src/Common_Table_Operations/Date_Time_Spec.enso
index c055e7904eb..e2fb4a04131 100644
--- a/test/Table_Tests/src/Common_Table_Operations/Date_Time_Spec.enso
+++ b/test/Table_Tests/src/Common_Table_Operations/Date_Time_Spec.enso
@@ -319,8 +319,6 @@ add_specs suite_builder setup =
             (t1.at "X1").date_diff (Date.new 2021 03 01) Date_Period.Day . to_vector . should_equal [58]
             (t1.at "X1").date_diff (Date.new 2021 03 01) Date_Period.Month . to_vector . should_equal [1]
 
-            # We do allow the `Time_Period.Day` as a kind of alias for `Date_Period.Day` here.
-            (t1.at "X").date_diff (t1.at "Y") Time_Period.Day . to_vector . should_equal [32]
             (t1.at "X").date_diff (t1.at "Y") Time_Period.Hour . should_fail_with Illegal_Argument
 
             t2 = dates1.get.select_columns ["dt_X", "dt_Y"] reorder=True . rename_columns ["X", "Y"]
@@ -335,8 +333,6 @@ add_specs suite_builder setup =
             (t2.at "X").date_diff (t2.at "Y") Date_Period.Year . to_vector . should_equal [0]
             (t2.at "X").date_diff (Date_Time.new 2031 12 1 10 15 0 zone=zone) Date_Period.Year . to_vector . should_equal [10]
 
-            (t2.at "X").date_diff (t2.at "Y") Time_Period.Day . to_vector . should_equal [32]
-
             (t2.at "X").date_diff (t2.at "Y") Time_Period.Hour . to_vector . should_equal [770]
             (t2.at "X").date_diff (Date_Time.new 2021 11 3 12 15 0 zone=zone) Time_Period.Hour . to_vector . should_equal [2]
 
@@ -365,9 +361,6 @@ add_specs suite_builder setup =
             # There is no default period:
             (t3.at "X").date_diff (t3.at "Y") Date_Period.Month . should_fail_with Illegal_Argument
 
-            # This will always be 0, should it be allowed?
-            (t3.at "X").date_diff (t3.at "Y") Time_Period.Day . should_fail_with Illegal_Argument
-
             (t3.at "X").date_diff (t3.at "Y") Time_Period.Hour . to_vector . should_equal [2]
             (t3.at "X").date_diff (Time_Of_Day.new 9 15 0) Time_Period.Hour . to_vector . should_equal [-1]
 
@@ -434,14 +427,9 @@ add_specs suite_builder setup =
             (t1.at "X").date_add 1 Date_Period.Quarter . to_vector . should_equal [Date.new 2021 04 30, Date.new 2021 04 01, Date.new 2022 03 31]
 
             (t1.at "X").date_add 1 Time_Period.Hour . should_fail_with Illegal_Argument
-            # Will accept Time_Period.Day as alias of Date_Period.Day
-            r1 = (t1.at "X").date_add 1 Time_Period.Day
-            r1.value_type . should_equal Value_Type.Date
-            r1.to_vector . should_equal [Date.new 2021 02 01, Date.new 2021 01 02, Date.new 2022 01 01]
 
             t2 = table_builder [["X", [Date_Time.new 2021 01 31 12 30 0, Date_Time.new 2021 01 01 12 30 0, Date_Time.new 2021 12 31 12 30 0]], ["Y", [11, -1, 0]]]
             (t2.at "X").date_add (t2.at "Y") Date_Period.Day . to_vector . should_equal_tz_agnostic [Date_Time.new 2021 02 11 12 30 0, Date_Time.new 2020 12 31 12 30 0, Date_Time.new 2021 12 31 12 30 0]
-            (t2.at "X").date_add -1 Time_Period.Day . to_vector . should_equal_tz_agnostic [Date_Time.new 2021 01 30 12 30 0, Date_Time.new 2020 12 31 12 30 0, Date_Time.new 2021 12 30 12 30 0]
             (t2.at "X").date_add (t2.at "Y") Date_Period.Month . to_vector . should_equal_tz_agnostic [Date_Time.new 2021 12 31 12 30 0, Date_Time.new 2020 12 01 12 30 0, Date_Time.new 2021 12 31 12 30 0]
             (t2.at "X").date_add 1 Date_Period.Month . to_vector . should_equal_tz_agnostic [Date_Time.new 2021 02 28 12 30 0, Date_Time.new 2021 02 01 12 30 0, Date_Time.new 2022 01 31 12 30 0]
             (t2.at "X").date_add (t2.at "Y") Date_Period.Year . to_vector . should_equal_tz_agnostic [Date_Time.new 2032 01 31 12 30 0, Date_Time.new 2020 01 01 12 30 0, Date_Time.new 2021 12 31 12 30 0]
@@ -478,7 +466,6 @@ add_specs suite_builder setup =
                     (t3.at "X").date_add 1 Time_Period.Nanosecond . should_fail_with Unsupported_Database_Operation
 
             # No sense to shift Time_Of_Day by days either or by a Date_Period
-            (t3.at "X").date_add (t3.at "Y") Time_Period.Day . to_vector . should_fail_with Illegal_Argument
             (t3.at "X").date_add 1 Date_Period.Month . to_vector . should_fail_with Illegal_Argument
 
             # Date period defaults to Day for date/date-time
@@ -509,9 +496,6 @@ add_specs suite_builder setup =
             # instead let's compare as local timestamps:
             plus_1_calendar_day.to_vector . map as_local_date_time_repr . should_equal ["2023-03-27 00:30:00.0"]
 
-            # Time_Period.Day will shift by 24 hours.
-            x.date_add 1 Time_Period.Day . to_vector . should_equal_tz_agnostic [Date_Time.new 2023 03 27 01 30 00 zone=zone]
-
             # Once we add 3 months, we should get the same hour back.
             plus_3_months = x.date_add 3 Date_Period.Month
             plus_3_months.to_vector.map as_local_date_time_repr . should_equal ["2023-06-26 00:30:00.0"]
@@ -528,15 +512,12 @@ add_specs suite_builder setup =
                  cannot 'guess' that it should be a day of a difference and
                  since it is 'just' 23 hours - there is 0 days.
             [[0], [1]] . should_contain (x.date_diff dt2 Date_Period.Day . to_vector)
-            # Again consistent for both backends, when counting in hours - 23 hours is not a full 24-hour day.
-            x.date_diff dt2 Time_Period.Day . to_vector . should_equal [0]
 
             dt4 = Date_Time.new 2023 03 29 00 30 00 zone=zone
             y = t.at "Y"
             # No DST switch here, so all backends agree that 0 days elapsed in the 23 hours.
             # Snowflake returns 1...
             y.date_diff dt4 Date_Period.Day . to_vector . should_equal [0]
-            y.date_diff dt4 Time_Period.Day . to_vector . should_equal [0]
             y.date_diff dt4 Time_Period.Hour . to_vector . should_equal [23]
 
     if setup.test_selection.date_time.not then
diff --git a/test/Table_Tests/src/Common_Table_Operations/Expression_Spec.enso b/test/Table_Tests/src/Common_Table_Operations/Expression_Spec.enso
index 66a39aaff40..ba282e205f8 100644
--- a/test/Table_Tests/src/Common_Table_Operations/Expression_Spec.enso
+++ b/test/Table_Tests/src/Common_Table_Operations/Expression_Spec.enso
@@ -11,7 +11,6 @@ from Standard.Database.Errors import SQL_Error
 
 from Standard.Test import all
 
-
 from project.Util import all
 from project.Common_Table_Operations.Util import run_default_backend, build_sorted_table
 
@@ -218,10 +217,6 @@ add_specs suite_builder detailed setup =
             expression_test "1_000.456/2" 500.228
             expression_test "2^4" 16
             expression_test "11%3" 2
-            expression_test "truncate(3.3)" 3
-            expression_test "ceil(5.3)" 6
-            expression_test "floor(5.3)" 5
-            expression_test "round(5.5)" 6
 
         specify_test "should be able to do basic arithmetic with order" group_builder expression_test->
             expression_test "1+1*2+2" 5
@@ -375,6 +370,20 @@ add_specs suite_builder detailed setup =
             expression_test "min(10, 3, 8)" 3
             expression_test "max([A], [B], 3)" [3, 3, 3, 4, 6]
 
+        specify_test "should be able to use functions with constants" group_builder expression_test->
+            expression_test "truncate(3.3)" 3
+            expression_test "CEIL(5.3)" 6
+            expression_test "floor(5.3)" 5
+            expression_test "rOuNd(5.5)" 6
+
+        specify_test "should be able to use scalar functions" group_builder expression_test->
+            expression_test "first([C])" "Hello"
+            expression_test "at([C], 2)" "Hello World!"
+
+        specify_test "should be able to pass Atom constructors to functions" group_builder expression_test->
+            expression_test "cast([A], ..Char)" ["1", "2", "3", "4", "5"]
+            expression_test "starts_WITH([C], 'HELLO', ..INSENSITIVE)" [True, False, True, False, Nothing]
+
     suite_builder.group prefix+"Expression Errors should be handled" group_builder->
         expect_error ctor expr =
             expr.should_fail_with Expression_Error
diff --git a/test/Tableau_Tests/src/Read_Spec.enso b/test/Tableau_Tests/src/Read_Spec.enso
index 8a98139ebf8..ef3783e84e7 100644
--- a/test/Tableau_Tests/src/Read_Spec.enso
+++ b/test/Tableau_Tests/src/Read_Spec.enso
@@ -3,7 +3,7 @@ import Standard.Base.Errors.File_Error.File_Error
 
 from Standard.Table import all
 from Standard.Tableau import Hyper_File
-import Standard.Tableau.Hyper_Errors.Table_Not_Found
+import Standard.Tableau.Hyper_Errors.Hyper_Table_Not_Found
 
 from Standard.Test import all
 
@@ -60,7 +60,7 @@ add_specs suite_builder = suite_builder.group "Read Tables" group_builder->
 
     group_builder.specify "should handle a missing table when reading a table" <|
         r1 = Hyper_File.new names_file . read "NoTable"
-        r1.should_fail_with Table_Not_Found
+        r1.should_fail_with Hyper_Table_Not_Found
 
         r2 = Hyper_File.new names_file . read "NoTable" schema="Extract"
-        r2.should_fail_with Table_Not_Found
+        r2.should_fail_with Hyper_Table_Not_Found