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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
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@ -1693,6 +1693,7 @@ _outJoinExpr(StringInfo str, const JoinExpr *node)
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WRITE_NODE_FIELD(larg);
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WRITE_NODE_FIELD(rarg);
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WRITE_NODE_FIELD(usingClause);
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WRITE_NODE_FIELD(join_using_alias);
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WRITE_NODE_FIELD(quals);
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WRITE_NODE_FIELD(alias);
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WRITE_INT_FIELD(rtindex);
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@ -3193,6 +3194,7 @@ _outRangeTblEntry(StringInfo str, const RangeTblEntry *node)
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WRITE_NODE_FIELD(joinaliasvars);
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WRITE_NODE_FIELD(joinleftcols);
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WRITE_NODE_FIELD(joinrightcols);
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WRITE_NODE_FIELD(join_using_alias);
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break;
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case RTE_FUNCTION:
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WRITE_NODE_FIELD(functions);
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