mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-20 22:11:45 +03:00
3056678e04
PR for the translation / execution step of [aggregation predicate filters](https://github.com/hasura/graphql-engine-mono/issues/5174). [`translateAVAggregationPredicates`](translateAVAggregationPredicates) is the main change of note, everything else is a supporting or helper function. Please note this doesn't yet include [tests relating to permissions](https://hasurahq.slack.com/archives/C01RZPEPF0W/p1662560092197769); I decided to raise a PR without them for slightly faster feedback. I may include them in this PR or a separately if it's not trivial. PR-URL: https://github.com/hasura/graphql-engine-mono/pull/5724 GitOrigin-RevId: fcac258b64066e2bd45108372165a16fd957f5ab
55 lines
2.4 KiB
Haskell
55 lines
2.4 KiB
Haskell
-- | This module defines the top-level translation functions pertaining to
|
|
-- queries that use aggregation (i.e., /not/ so-called "simple" selects) into
|
|
-- Postgres AST.
|
|
module Hasura.Backends.Postgres.Translate.Select.Aggregate
|
|
( mkAggregateSelect,
|
|
selectAggregateQuerySQL,
|
|
)
|
|
where
|
|
|
|
import Control.Monad.Writer.Strict (runWriter)
|
|
import Database.PG.Query (Query, fromBuilder)
|
|
import Hasura.Backends.Postgres.SQL.DML (BoolExp (BELit), Select)
|
|
import Hasura.Backends.Postgres.SQL.RenameIdentifiers (renameIdentifiers)
|
|
import Hasura.Backends.Postgres.SQL.Types (IsIdentifier (toIdentifier))
|
|
import Hasura.Backends.Postgres.Translate.Select.AnnotatedFieldJSON
|
|
import Hasura.Backends.Postgres.Translate.Select.Internal.GenerateSelect (generateSQLSelectFromArrayNode)
|
|
import Hasura.Backends.Postgres.Translate.Select.Internal.Process (processAnnAggregateSelect)
|
|
import Hasura.Backends.Postgres.Translate.Types (MultiRowSelectNode (MultiRowSelectNode), SelectNode (SelectNode), SourcePrefixes (SourcePrefixes))
|
|
import Hasura.Prelude
|
|
import Hasura.RQL.IR.Select (AnnAggregateSelect, AnnSelectG (_asnStrfyNum))
|
|
import Hasura.RQL.Types.Backend (Backend)
|
|
import Hasura.RQL.Types.Common (FieldName (FieldName))
|
|
import Hasura.SQL.Backend (BackendType (Postgres))
|
|
import Hasura.SQL.Types (ToSQL (toSQL))
|
|
|
|
-- | Translates IR to Postgres queries for aggregated SELECTs.
|
|
--
|
|
-- See 'mkAggregateSelect' for the Postgres AST.
|
|
selectAggregateQuerySQL ::
|
|
forall pgKind.
|
|
(Backend ('Postgres pgKind), PostgresAnnotatedFieldJSON pgKind) =>
|
|
AnnAggregateSelect ('Postgres pgKind) ->
|
|
Query
|
|
selectAggregateQuerySQL = fromBuilder . toSQL . mkAggregateSelect
|
|
|
|
mkAggregateSelect ::
|
|
forall pgKind.
|
|
(Backend ('Postgres pgKind), PostgresAnnotatedFieldJSON pgKind) =>
|
|
AnnAggregateSelect ('Postgres pgKind) ->
|
|
Select
|
|
mkAggregateSelect annAggSel =
|
|
let ((selectSource, nodeExtractors, topExtractor), joinTree) =
|
|
runWriter $
|
|
flip runReaderT strfyNum $
|
|
processAnnAggregateSelect sourcePrefixes rootFieldName annAggSel
|
|
selectNode = SelectNode nodeExtractors joinTree
|
|
arrayNode = MultiRowSelectNode [topExtractor] selectNode
|
|
in renameIdentifiers $
|
|
generateSQLSelectFromArrayNode selectSource arrayNode $ BELit True
|
|
where
|
|
strfyNum = _asnStrfyNum annAggSel
|
|
rootFieldName = FieldName "root"
|
|
rootIdentifier = toIdentifier rootFieldName
|
|
sourcePrefixes = SourcePrefixes rootIdentifier rootIdentifier
|