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fix: empty spread embeddings return unexpected SQL error

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Fixes the SQL error from postgres when an empty spread embeddings
like `...table()` is requested.
This commit is contained in:
Taimoor Zaeem
2025-08-21 13:47:19 +00:00
committed by Wolfgang Walther
parent 6ecacbc4cc
commit d863065a51
3 changed files with 41 additions and 6 deletions
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src/PostgREST/Query/QueryBuilder.hs
+6 -6
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@@ -70,21 +70,21 @@ readPlanToQuery node@(Node ReadPlan{select,from=mainQi,fromAlias,where_=logicFor
getJoinSelects :: ReadPlanTree -> [SQL.Snippet]
getJoinSelects (Node ReadPlan{relSelect} _) =
mapMaybe relSelectToSnippet relSelect
join $ map relSelectToSnippet relSelect
where
relSelectToSnippet :: RelSelectField -> Maybe SQL.Snippet
relSelectToSnippet :: RelSelectField -> [SQL.Snippet]
relSelectToSnippet fld =
let aggAlias = pgFmtIdent $ rsAggAlias fld
in
case fld of
JsonEmbed{rsEmptyEmbed = True} ->
Nothing
[]
JsonEmbed{rsSelName, rsEmbedMode = JsonObject} ->
Just $ "row_to_json(" <> aggAlias <> ".*)::jsonb AS " <> pgFmtIdent rsSelName
["row_to_json(" <> aggAlias <> ".*)::jsonb AS " <> pgFmtIdent rsSelName]
JsonEmbed{rsSelName, rsEmbedMode = JsonArray} ->
Just $ "COALESCE( " <> aggAlias <> "." <> aggAlias <> ", '[]') AS " <> pgFmtIdent rsSelName
["COALESCE( " <> aggAlias <> "." <> aggAlias <> ", '[]') AS " <> pgFmtIdent rsSelName]
Spread{rsSpreadSel, rsAggAlias} ->
Just $ intercalateSnippet ", " (pgFmtSpreadSelectItem rsAggAlias <$> rsSpreadSel)
pgFmtSpreadSelectItem rsAggAlias <$> rsSpreadSel
getJoins :: ReadPlanTree -> [SQL.Snippet]
getJoins (Node _ []) = []