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https://github.com/hasura/graphql-engine.git
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29b6ea54c0
This does not yet enable Aggregation Predicates to users, but enables building the execution backend and tests of the schema. This is a prerequisite for: * #5174 * #5261 PR-URL: https://github.com/hasura/graphql-engine-mono/pull/5607 GitOrigin-RevId: e07beb01949724545131629c111d41a7ec4636f2
322 lines
14 KiB
Haskell
322 lines
14 KiB
Haskell
{-# LANGUAGE PartialTypeSignatures #-}
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-- | Postgres Translate BoolExp
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--
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-- Convert IR boolean expressions to Postgres-specific SQL expressions.
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module Hasura.Backends.Postgres.Translate.BoolExp
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( toSQLBoolExp,
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annBoolExp,
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)
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where
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import Data.HashMap.Strict qualified as M
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import Data.Text.Extended (ToTxt)
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import Hasura.Backends.Postgres.SQL.DML qualified as S
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import Hasura.Backends.Postgres.SQL.Types hiding (TableName)
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import Hasura.Backends.Postgres.Types.BoolExp
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import Hasura.Backends.Postgres.Types.Function (onArgumentExp)
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import Hasura.Base.Error
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import Hasura.Prelude
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import Hasura.RQL.IR.BoolExp
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import Hasura.RQL.Types.Backend
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import Hasura.RQL.Types.BoolExp
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import Hasura.RQL.Types.Column
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import Hasura.RQL.Types.Common
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import Hasura.RQL.Types.Function
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import Hasura.RQL.Types.Metadata.Backend
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import Hasura.RQL.Types.Relationships.Local
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import Hasura.RQL.Types.SchemaCache hiding (BoolExpCtx (..), BoolExpM (..))
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import Hasura.RQL.Types.Table
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import Hasura.SQL.Backend
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import Hasura.SQL.Types
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-- This convoluted expression instead of col = val
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-- to handle the case of col : null
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equalsBoolExpBuilder :: SQLExpression ('Postgres pgKind) -> SQLExpression ('Postgres pgKind) -> S.BoolExp
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equalsBoolExpBuilder qualColExp rhsExp =
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S.BEBin
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S.OrOp
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(S.BECompare S.SEQ qualColExp rhsExp)
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( S.BEBin
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S.AndOp
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(S.BENull qualColExp)
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(S.BENull rhsExp)
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)
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notEqualsBoolExpBuilder :: SQLExpression ('Postgres pgKind) -> SQLExpression ('Postgres pgKind) -> S.BoolExp
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notEqualsBoolExpBuilder qualColExp rhsExp =
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S.BEBin
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S.OrOp
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(S.BECompare S.SNE qualColExp rhsExp)
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( S.BEBin
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S.AndOp
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(S.BENotNull qualColExp)
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(S.BENull rhsExp)
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)
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annBoolExp ::
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(QErrM m, TableCoreInfoRM b m, BackendMetadata b) =>
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BoolExpRHSParser b m v ->
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TableName b ->
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FieldInfoMap (FieldInfo b) ->
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GBoolExp b ColExp ->
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m (AnnBoolExp b v)
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annBoolExp rhsParser rootTable fim boolExp =
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case boolExp of
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BoolAnd exps -> BoolAnd <$> procExps exps
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BoolOr exps -> BoolOr <$> procExps exps
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BoolNot e -> BoolNot <$> annBoolExp rhsParser rootTable fim e
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BoolExists (GExists refqt whereExp) ->
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withPathK "_exists" $ do
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refFields <- withPathK "_table" $ askFieldInfoMapSource refqt
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annWhereExp <- withPathK "_where" $ annBoolExp rhsParser rootTable refFields whereExp
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return $ BoolExists $ GExists refqt annWhereExp
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BoolField fld -> BoolField <$> annColExp rhsParser rootTable fim fld
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where
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procExps = mapM (annBoolExp rhsParser rootTable fim)
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annColExp ::
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(QErrM m, TableCoreInfoRM b m, BackendMetadata b) =>
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BoolExpRHSParser b m v ->
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TableName b ->
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FieldInfoMap (FieldInfo b) ->
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ColExp ->
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m (AnnBoolExpFld b v)
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annColExp rhsParser rootTable colInfoMap (ColExp fieldName colVal) = do
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colInfo <- askFieldInfo colInfoMap fieldName
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case colInfo of
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FIColumn pgi -> AVColumn pgi <$> parseBoolExpOperations (_berpValueParser rhsParser) rootTable colInfoMap (ColumnReferenceColumn pgi) colVal
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FIRelationship relInfo -> do
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relBoolExp <- decodeValue colVal
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relFieldInfoMap <- askFieldInfoMapSource $ riRTable relInfo
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annRelBoolExp <- annBoolExp rhsParser rootTable relFieldInfoMap $ unBoolExp relBoolExp
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return $ AVRelationship relInfo annRelBoolExp
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FIComputedField computedFieldInfo ->
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AVComputedField <$> buildComputedFieldBooleanExp (BoolExpResolver annBoolExp) rhsParser rootTable colInfoMap computedFieldInfo colVal
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-- Using remote fields in the boolean expression is not supported.
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FIRemoteRelationship {} ->
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throw400 UnexpectedPayload "remote field unsupported"
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-- | Translate an IR boolean expression to an SQL boolean expression. References
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-- to columns etc are relative to the given 'rootReference'.
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toSQLBoolExp ::
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forall pgKind.
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Backend ('Postgres pgKind) =>
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-- | The name of the tabular value in query scope that the boolean expression
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-- applies to
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S.Qual ->
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-- | The boolean expression to translate
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AnnBoolExpSQL ('Postgres pgKind) ->
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S.BoolExp
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toSQLBoolExp rootReference e =
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evalState
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( runReaderT
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(unBoolExpM (translateBoolExp e))
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initialCtx
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)
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0
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where
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initialCtx =
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BoolExpCtx
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{ currTableReference = rootReference,
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rootReference = rootReference
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}
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-- | The table context of boolean expression translation. This is used to
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-- resolve references to fields, as those may refer to the so-called 'root
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-- table' (identified by a '$'-sign in the expression input syntax) or the
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-- 'current' table.
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data BoolExpCtx = BoolExpCtx
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{ -- | Reference to the current tabular value.
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currTableReference :: S.Qual,
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-- | Reference to the root tabular value.
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rootReference :: S.Qual
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}
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-- | The monad that carries the translation of boolean expressions. This
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-- supports the generation of fresh names for aliasing sub-expressions and
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-- maintains the table context of the expressions being translated.
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newtype BoolExpM a = BoolExpM {unBoolExpM :: ReaderT BoolExpCtx (State Word64) a}
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deriving (Functor, Applicative, Monad, MonadReader BoolExpCtx, MonadState Word64)
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-- | Translate a 'GBoolExp' with annotated SQLExpressions in the leaves into a
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-- bare SQL Boolean Expression.
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translateBoolExp ::
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forall pgKind.
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(Backend ('Postgres pgKind)) =>
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AnnBoolExpSQL ('Postgres pgKind) ->
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BoolExpM S.BoolExp
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translateBoolExp = \case
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BoolAnd bes -> do
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sqlBExps <- mapM translateBoolExp bes
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return $ foldr (S.BEBin S.AndOp) (S.BELit True) sqlBExps
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BoolOr bes -> do
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sqlBExps <- mapM translateBoolExp bes
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return $ foldr (S.BEBin S.OrOp) (S.BELit False) sqlBExps
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BoolNot notExp -> S.BENot <$> translateBoolExp notExp
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BoolExists (GExists currTableReference wh) -> do
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whereExp <- recCurrentTable (S.QualTable currTableReference) wh
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return $ S.mkExists (S.FISimple currTableReference Nothing) whereExp
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BoolField boolExp -> case boolExp of
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AVColumn colInfo opExps -> do
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BoolExpCtx {rootReference, currTableReference} <- ask
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let colFld = fromCol @('Postgres pgKind) $ ciColumn colInfo
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bExps = map (mkFieldCompExp rootReference currTableReference $ LColumn colFld) opExps
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return $ foldr (S.BEBin S.AndOp) (S.BELit True) bExps
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AVRelationship (RelInfo _ _ colMapping relTN _ _) nesAnn -> do
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-- Convert the where clause on the relationship
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aliasRelTN <- freshIdentifier relTN
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annRelBoolExp <- recCurrentTable (S.QualifiedIdentifier aliasRelTN Nothing) nesAnn
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BoolExpCtx {currTableReference} <- ask
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let backCompExp = foldr (S.BEBin S.AndOp) (S.BELit True) $
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flip map (M.toList colMapping) $ \(lCol, rCol) ->
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S.BECompare
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S.SEQ
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(mkQCol (S.QualifiedIdentifier aliasRelTN Nothing) rCol)
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(mkQCol currTableReference lCol)
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innerBoolExp = S.BEBin S.AndOp backCompExp annRelBoolExp
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return $ S.mkExists (S.FISimple relTN $ Just $ S.toTableAlias aliasRelTN) innerBoolExp
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AVComputedField (AnnComputedFieldBoolExp _ _ function sessionArgPresence cfBoolExp) -> do
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case cfBoolExp of
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CFBEScalar opExps -> do
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BoolExpCtx {rootReference, currTableReference} <- ask
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-- Convert the where clause on scalar computed field
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let bExps = map (mkFieldCompExp rootReference currTableReference $ LComputedField function sessionArgPresence) opExps
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pure $ foldr (S.BEBin S.AndOp) (S.BELit True) bExps
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CFBETable _ be -> do
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-- Convert the where clause on table computed field
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BoolExpCtx {currTableReference} <- ask
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aliasFunction <- freshIdentifier function
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let functionExp =
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mkComputedFieldFunctionExp currTableReference function sessionArgPresence $
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Just $ S.toTableAlias aliasFunction
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S.mkExists (S.FIFunc functionExp) <$> recCurrentTable (S.QualifiedIdentifier aliasFunction Nothing) be
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AVAggregationPredicates _aggPreds -> error "Not implemented yet: Pending https://github.com/hasura/graphql-engine-mono/issues/5174"
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where
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mkQCol :: forall a. IsIdentifier a => S.Qual -> a -> S.SQLExp
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mkQCol q = S.SEQIdentifier . S.QIdentifier q . toIdentifier
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-- Draw a fresh identifier intended to alias the given object.
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freshIdentifier :: forall a. ToTxt a => QualifiedObject a -> BoolExpM Identifier
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freshIdentifier obj = do
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curVarNum <- get
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put $ curVarNum + 1
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let newIdentifier =
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Identifier $
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"_be_" <> tshow curVarNum <> "_"
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<> snakeCaseQualifiedObject obj
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return newIdentifier
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-- Call recursively using the given identifier for the 'current' table.
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recCurrentTable :: S.Qual -> AnnBoolExpSQL ('Postgres pgKind) -> BoolExpM S.BoolExp
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recCurrentTable curr = local (\e -> e {currTableReference = curr}) . translateBoolExp
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data LHSField b
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= LColumn FieldName
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| LComputedField QualifiedFunction (FunctionArgsExp b (SQLExpression b))
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mkComputedFieldFunctionExp ::
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S.Qual ->
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QualifiedFunction ->
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FunctionArgsExp ('Postgres pgKind) (SQLExpression ('Postgres pgKind)) ->
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Maybe S.TableAlias ->
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S.FunctionExp
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mkComputedFieldFunctionExp qual function functionArgs alias =
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-- "function_schema"."function_name"("qual".*)
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let tableRowInput = S.SEStar $ Just qual
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resolvedFunctionArgs =
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let FunctionArgsExp {..} = fmap (onArgumentExp tableRowInput (S.SEIdentifier . Identifier)) functionArgs
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in S.FunctionArgs _faePositional _faeNamed
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in S.FunctionExp function resolvedFunctionArgs $ flip S.FunctionAlias Nothing <$> alias
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mkFieldCompExp ::
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S.Qual -> S.Qual -> LHSField ('Postgres pgKind) -> OpExpG ('Postgres pgKind) S.SQLExp -> S.BoolExp
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mkFieldCompExp rootReference currTableReference lhsField = mkCompExp qLhsField
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where
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qLhsField = case lhsField of
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LColumn fieldName ->
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-- "qual"."column" =
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S.SEQIdentifier $ S.QIdentifier currTableReference $ Identifier $ getFieldNameTxt fieldName
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LComputedField function sessionArgPresence ->
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-- "function_schema"."function_name"("qual".*) =
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S.SEFunction $ mkComputedFieldFunctionExp currTableReference function sessionArgPresence Nothing
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mkQCol :: RootOrCurrentColumn ('Postgres pgKind) -> S.SQLExp
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mkQCol (RootOrCurrentColumn IsRoot col) = S.SEQIdentifier $ S.QIdentifier rootReference $ toIdentifier col
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mkQCol (RootOrCurrentColumn IsCurrent col) = S.SEQIdentifier $ S.QIdentifier currTableReference $ toIdentifier col
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mkCompExp :: SQLExpression ('Postgres pgKind) -> OpExpG ('Postgres pgKind) (SQLExpression ('Postgres pgKind)) -> S.BoolExp
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mkCompExp lhs = \case
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ACast casts -> mkCastsExp casts
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AEQ False val -> equalsBoolExpBuilder lhs val
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AEQ True val -> S.BECompare S.SEQ lhs val
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ANE False val -> notEqualsBoolExpBuilder lhs val
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ANE True val -> S.BECompare S.SNE lhs val
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AIN val -> S.BECompareAny S.SEQ lhs val
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ANIN val -> S.BENot $ S.BECompareAny S.SEQ lhs val
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AGT val -> S.BECompare S.SGT lhs val
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ALT val -> S.BECompare S.SLT lhs val
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AGTE val -> S.BECompare S.SGTE lhs val
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ALTE val -> S.BECompare S.SLTE lhs val
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ALIKE val -> S.BECompare S.SLIKE lhs val
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ANLIKE val -> S.BECompare S.SNLIKE lhs val
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CEQ rhsCol -> S.BECompare S.SEQ lhs $ mkQCol rhsCol
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CNE rhsCol -> S.BECompare S.SNE lhs $ mkQCol rhsCol
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CGT rhsCol -> S.BECompare S.SGT lhs $ mkQCol rhsCol
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CLT rhsCol -> S.BECompare S.SLT lhs $ mkQCol rhsCol
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CGTE rhsCol -> S.BECompare S.SGTE lhs $ mkQCol rhsCol
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CLTE rhsCol -> S.BECompare S.SLTE lhs $ mkQCol rhsCol
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ANISNULL -> S.BENull lhs
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ANISNOTNULL -> S.BENotNull lhs
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ABackendSpecific op -> case op of
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AILIKE val -> S.BECompare S.SILIKE lhs val
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ANILIKE val -> S.BECompare S.SNILIKE lhs val
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ASIMILAR val -> S.BECompare S.SSIMILAR lhs val
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ANSIMILAR val -> S.BECompare S.SNSIMILAR lhs val
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AREGEX val -> S.BECompare S.SREGEX lhs val
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AIREGEX val -> S.BECompare S.SIREGEX lhs val
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ANREGEX val -> S.BECompare S.SNREGEX lhs val
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ANIREGEX val -> S.BECompare S.SNIREGEX lhs val
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AContains val -> S.BECompare S.SContains lhs val
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AContainedIn val -> S.BECompare S.SContainedIn lhs val
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AHasKey val -> S.BECompare S.SHasKey lhs val
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AHasKeysAny val -> S.BECompare S.SHasKeysAny lhs val
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AHasKeysAll val -> S.BECompare S.SHasKeysAll lhs val
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AAncestor val -> S.BECompare S.SContains lhs val
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AAncestorAny val -> S.BECompare S.SContains lhs val
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ADescendant val -> S.BECompare S.SContainedIn lhs val
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ADescendantAny val -> S.BECompare S.SContainedIn lhs val
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AMatches val -> S.BECompare S.SREGEX lhs val
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AMatchesAny val -> S.BECompare S.SHasKey lhs val
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AMatchesFulltext val -> S.BECompare S.SMatchesFulltext lhs val
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ASTContains val -> mkGeomOpBe "ST_Contains" val
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ASTCrosses val -> mkGeomOpBe "ST_Crosses" val
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ASTEquals val -> mkGeomOpBe "ST_Equals" val
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ASTIntersects val -> mkGeomOpBe "ST_Intersects" val
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AST3DIntersects val -> mkGeomOpBe "ST_3DIntersects" val
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ASTOverlaps val -> mkGeomOpBe "ST_Overlaps" val
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ASTTouches val -> mkGeomOpBe "ST_Touches" val
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ASTWithin val -> mkGeomOpBe "ST_Within" val
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AST3DDWithinGeom (DWithinGeomOp r val) -> applySQLFn "ST_3DDWithin" [lhs, val, r]
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ASTDWithinGeom (DWithinGeomOp r val) -> applySQLFn "ST_DWithin" [lhs, val, r]
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ASTDWithinGeog (DWithinGeogOp r val sph) -> applySQLFn "ST_DWithin" [lhs, val, r, sph]
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ASTIntersectsRast val -> applySTIntersects [lhs, val]
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ASTIntersectsNbandGeom (STIntersectsNbandGeommin nband geommin) -> applySTIntersects [lhs, nband, geommin]
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ASTIntersectsGeomNband (STIntersectsGeomminNband geommin mNband) -> applySTIntersects [lhs, geommin, withSQLNull mNband]
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where
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mkGeomOpBe fn v = applySQLFn fn [lhs, v]
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applySQLFn f exps = S.BEExp $ S.SEFnApp f exps Nothing
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applySTIntersects = applySQLFn "ST_Intersects"
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withSQLNull = fromMaybe S.SENull
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mkCastsExp casts =
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sqlAll . flip map (M.toList casts) $ \(targetType, operations) ->
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let targetAnn = S.mkTypeAnn $ CollectableTypeScalar targetType
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in sqlAll $ map (mkCompExp (S.SETyAnn lhs targetAnn)) operations
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sqlAll = foldr (S.BEBin S.AndOp) (S.BELit True)
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