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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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src/backend/catalog/sql_features.txt
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@@ -264,7 +264,7 @@ F401 Extended joined table 02 FULL OUTER JOIN YES
F401 Extended joined table 04 CROSS JOIN YES
F402 Named column joins for LOBs, arrays, and multisets YES
F403 Partitioned joined tables NO
F404 Range variable for common column names NO
F404 Range variable for common column names YES
F411 Time zone specification YES differences regarding literal interpretation
F421 National character YES
F431 Read-only scrollable cursors YES