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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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2
src/backend/nodes/readfuncs.c
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@ -1346,6 +1346,7 @@ _readJoinExpr(void)
READ_NODE_FIELD(larg);
READ_NODE_FIELD(rarg);
READ_NODE_FIELD(usingClause);
READ_NODE_FIELD(join_using_alias);
READ_NODE_FIELD(quals);
READ_NODE_FIELD(alias);
READ_INT_FIELD(rtindex);
@ -1449,6 +1450,7 @@ _readRangeTblEntry(void)
READ_NODE_FIELD(joinaliasvars);
READ_NODE_FIELD(joinleftcols);
READ_NODE_FIELD(joinrightcols);
READ_NODE_FIELD(join_using_alias);
break;
case RTE_FUNCTION:
READ_NODE_FIELD(functions);