database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-27 07:42:10 +03:00
Code Activity

Allow an alias to be attached to a JOIN ... USING

Browse Source 
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 <vik.fearing@2ndquadrant.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/454638cf-d563-ab76-a585-2564428062af@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2021-03-31 17:09:24 +02:00
parent 27e1f14563
commit 055fee7eb4
22 changed files with 315 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/backend/optimizer/plan/subselect.c
View File

@@ -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 */