From bcedd8f5fce0b69970cf0cee7bca560833d05869 Mon Sep 17 00:00:00 2001 From: Dean Rasheed Date: Wed, 20 Jul 2022 09:29:42 +0100 Subject: Make subquery aliases optional in the FROM clause. This allows aliases for sub-SELECTs and VALUES clauses in the FROM clause to be omitted. This is an extension of the SQL standard, supported by some other database systems, and so eases the transition from such systems, as well as removing the minor inconvenience caused by requiring these aliases. Patch by me, reviewed by Tom Lane. Discussion: https://postgr.es/m/CAEZATCUCGCf82=hxd9N5n6xGHPyYpQnxW8HneeH+uP7yNALkWA@mail.gmail.com --- src/backend/utils/adt/ruleutils.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'src/backend/utils/adt/ruleutils.c') diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c index 26cf4fa9a0e..513bf0f026f 100644 --- a/src/backend/utils/adt/ruleutils.c +++ b/src/backend/utils/adt/ruleutils.c @@ -11725,7 +11725,11 @@ get_from_clause_item(Node *jtnode, Query *query, deparse_context *context) else if (rte->rtekind == RTE_SUBQUERY || rte->rtekind == RTE_VALUES) { - /* Alias is syntactically required for SUBQUERY and VALUES */ + /* + * For a subquery, always print alias. This makes the output SQL + * spec-compliant, even though we allow the alias to be omitted on + * input. + */ printalias = true; } else if (rte->rtekind == RTE_CTE) -- cgit v1.2.3