diff options
| author | Dean Rasheed <dean.a.rasheed@gmail.com> | 2022-07-20 09:29:42 +0100 |
|---|---|---|
| committer | Dean Rasheed <dean.a.rasheed@gmail.com> | 2022-07-20 09:29:42 +0100 |
| commit | bcedd8f5fce0b69970cf0cee7bca560833d05869 (patch) | |
| tree | c37888d24735977b7a0463b0277c1cbe459ac69f /src/backend/utils/adt | |
| parent | 1caf915ff31e91031f0a0b8e1016df2b59d6f9de (diff) | |
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
Diffstat (limited to 'src/backend/utils/adt')
| -rw-r--r-- | src/backend/utils/adt/ruleutils.c | 6 |
1 files changed, 5 insertions, 1 deletions
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) |