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| author | Peter Eisentraut <peter@eisentraut.org> | 2021-03-31 17:09:24 +0200 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2021-03-31 17:10:50 +0200 |
| commit | 055fee7eb4dcc78e58672aef146334275e1cc40d (patch) | |
| tree | 2034e69c471453e9aea59712b09d3fed95bce330 /src/backend/utils/adt/ruleutils.c | |
| parent | 27e1f14563cf982f1f4d71e21ef247866662a052 (diff) | |
| download | postgresql-055fee7eb4dcc78e58672aef146334275e1cc40d.tar.gz postgresql-055fee7eb4dcc78e58672aef146334275e1cc40d.zip | |
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 <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
Diffstat (limited to 'src/backend/utils/adt/ruleutils.c')
| -rw-r--r-- | src/backend/utils/adt/ruleutils.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c index 3de98d2333e..82b73726f13 100644 --- a/src/backend/utils/adt/ruleutils.c +++ b/src/backend/utils/adt/ruleutils.c @@ -10813,6 +10813,10 @@ get_from_clause_item(Node *jtnode, Query *query, deparse_context *context) appendStringInfoString(buf, quote_identifier(colname)); } appendStringInfoChar(buf, ')'); + + if (j->join_using_alias) + appendStringInfo(buf, " AS %s", + quote_identifier(j->join_using_alias->aliasname)); } else if (j->quals) { |