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perf: optimize count=exact when there's no limits, offsets or db-max-rows

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Laurence Isla
2026-01-28 18:43:44 -05:00
parent d031bb2df5
commit d10c779fc6
6 changed files with 104 additions and 21 deletions
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src/PostgREST/Query.hs
+3 -3
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@@ -43,16 +43,16 @@ data MainQuery = MainQuery
mainQuery :: ActionPlan -> AppConfig -> ApiRequest -> AuthResult -> Maybe QualifiedIdentifier -> MainQuery
mainQuery (NoDb _) _ _ _ _ = MainQuery mempty Nothing mempty (mempty, mempty, mempty) mempty
mainQuery (Db plan) conf@AppConfig{..} apiReq@ApiRequest{iPreferences=Preferences{..}} authRes preReq =
mainQuery (Db plan) conf@AppConfig{..} apiReq@ApiRequest{iTopLevelRange=range, iPreferences=Preferences{..}} authRes preReq =
let genQ = MainQuery (PreQuery.txVarQuery plan conf authRes apiReq) (PreQuery.preReqQuery <$> preReq) in
case plan of
DbCrud _ WrappedReadPlan{..} ->
let countQuery = QueryBuilder.readPlanToCountQuery wrReadPlan in
genQ (Statements.mainRead wrReadPlan countQuery preferCount configDbMaxRows pMedia wrHandler) (mempty, mempty, mempty)
genQ (Statements.mainRead wrReadPlan countQuery preferCount configDbMaxRows range pMedia wrHandler) (mempty, mempty, mempty)
(if shouldExplainCount preferCount then Just (Statements.postExplain countQuery) else Nothing)
DbCrud _ MutateReadPlan{..} ->
genQ (Statements.mainWrite mrReadPlan mrMutatePlan pMedia mrHandler preferRepresentation preferResolution) (mempty, mempty, mempty) mempty
DbCrud _ CallReadPlan{..} ->
genQ (Statements.mainCall crProc crCallPlan crReadPlan preferCount pMedia crHandler) (mempty, mempty, mempty) mempty
genQ (Statements.mainCall crProc crCallPlan crReadPlan preferCount configDbMaxRows range pMedia crHandler) (mempty, mempty, mempty) mempty
MayUseDb InspectPlan{ipSchema=tSchema} ->
genQ mempty (SqlFragment.accessibleTables tSchema, SqlFragment.accessibleFuncs tSchema, SqlFragment.schemaDescription tSchema) mempty