diff options
| author | Peter Eisentraut | 2021-03-31 15:09:24 +0000 |
|---|---|---|
| committer | Peter Eisentraut | 2021-03-31 15:10:50 +0000 |
| commit | 055fee7eb4dcc78e58672aef146334275e1cc40d (patch) | |
| tree | 2034e69c471453e9aea59712b09d3fed95bce330 /src/backend/optimizer/plan/subselect.c | |
| parent | 27e1f14563cf982f1f4d71e21ef247866662a052 (diff) | |
Allow an alias to be attached to a JOIN ... USING
This allows something like
SELECT ... FROM t1 JOIN t2 USING (a, b, c) AS x
where x has the columns a, b, c and unlike a regular alias it does not
hide the range variables of the tables being joined t1 and t2.
Per SQL:2016 feature F404 "Range variable for common column names".
Reviewed-by: Vik Fearing <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: https://www.postgresql.org/message-id/flat/[email protected]
Diffstat (limited to 'src/backend/optimizer/plan/subselect.c')
| -rw-r--r-- | src/backend/optimizer/plan/subselect.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/backend/optimizer/plan/subselect.c b/src/backend/optimizer/plan/subselect.c index f3e46e0959e..9bb84c4c301 100644 --- a/src/backend/optimizer/plan/subselect.c +++ b/src/backend/optimizer/plan/subselect.c @@ -1365,6 +1365,7 @@ convert_ANY_sublink_to_join(PlannerInfo *root, SubLink *sublink, result->larg = NULL; /* caller must fill this in */ result->rarg = (Node *) rtr; result->usingClause = NIL; + result->join_using_alias = NULL; result->quals = quals; result->alias = NULL; result->rtindex = 0; /* we don't need an RTE for it */ @@ -1519,6 +1520,7 @@ convert_EXISTS_sublink_to_join(PlannerInfo *root, SubLink *sublink, else result->rarg = (Node *) subselect->jointree; result->usingClause = NIL; + result->join_using_alias = NULL; result->quals = whereClause; result->alias = NULL; result->rtindex = 0; /* we don't need an RTE for it */ |