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

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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
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4
src/backend/utils/adt/ruleutils.c
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@ -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)
{