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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
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| .gitignore | ||
| analyze.h | ||
| gramparse.h | ||
| kwlist.h | ||
| parse_agg.h | ||
| parse_clause.h | ||
| parse_coerce.h | ||
| parse_collate.h | ||
| parse_cte.h | ||
| parse_enr.h | ||
| parse_expr.h | ||
| parse_func.h | ||
| parse_node.h | ||
| parse_oper.h | ||
| parse_param.h | ||
| parse_relation.h | ||
| parse_target.h | ||
| parse_type.h | ||
| parse_utilcmd.h | ||
| parser.h | ||
| parsetree.h | ||
| scanner.h | ||
| scansup.h | ||