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Faster queries using json_agg

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This commit is contained in:
Ruslan Talpa
2017-12-12 15:44:50 +02:00
committed by GitHub
parent e4183780a9
commit effbec234f
8 changed files with 81 additions and 49 deletions
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src/PostgREST/QueryBuilder.hs
+3 -3
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@@ -249,7 +249,7 @@ requestToQuery schema isParent (DbRead (Node (Select colSelects tbls logicForest
getQueryParts (Node n@(_, (name, Just Relation{relType=Child,relTable=Table{tableName=table}}, alias, _)) forst) (j,s) = (j,sel:s)
where
sel = "COALESCE(("
<> "SELECT array_to_json(array_agg(row_to_json(" <> pgFmtIdent table <> ".*))) "
<> "SELECT json_agg(" <> pgFmtIdent table <> ".*) "
<> "FROM (" <> subquery <> ") " <> pgFmtIdent table
<> "), '[]') AS " <> pgFmtIdent (fromMaybe name alias)
where subquery = requestToQuery schema False (DbRead (Node n forst))
@@ -263,7 +263,7 @@ requestToQuery schema isParent (DbRead (Node (Select colSelects tbls logicForest
getQueryParts (Node n@(_, (name, Just Relation{relType=Many,relTable=Table{tableName=table}}, alias, _)) forst) (j,s) = (j,sel:s)
where
sel = "COALESCE (("
<> "SELECT array_to_json(array_agg(row_to_json(" <> pgFmtIdent table <> ".*))) "
<> "SELECT json_agg(" <> pgFmtIdent table <> ".*) "
<> "FROM (" <> subquery <> ") " <> pgFmtIdent table
<> "), '[]') AS " <> pgFmtIdent (fromMaybe name alias)
where subquery = requestToQuery schema False (DbRead (Node n forst))
@@ -336,7 +336,7 @@ asCsvF = asCsvHeaderF <> " || '\n' || " <> asCsvBodyF
asCsvBodyF = "coalesce(string_agg(substring(_postgrest_t::text, 2, length(_postgrest_t::text) - 2), '\n'), '')"
asJsonF :: SqlFragment
asJsonF = "coalesce(array_to_json(array_agg(row_to_json(_postgrest_t))), '[]')::character varying"
asJsonF = "coalesce(json_agg(_postgrest_t), '[]')::character varying"
asJsonSingleF :: SqlFragment --TODO! unsafe when the query actually returns multiple rows, used only on inserting and returning single element
asJsonSingleF = "coalesce(string_agg(row_to_json(_postgrest_t)::text, ','), '')::character varying "