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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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11
src/test/regress/sql/create_view.sql
View File

@ -328,6 +328,17 @@ select * from
\d+ view_of_joins
create table tbl1a (a int, c int);
create view view_of_joins_2a as select * from tbl1 join tbl1a using (a);
create view view_of_joins_2b as select * from tbl1 join tbl1a using (a) as x;
create view view_of_joins_2c as select * from (tbl1 join tbl1a using (a)) as y;
create view view_of_joins_2d as select * from (tbl1 join tbl1a using (a) as x) as y;
select pg_get_viewdef('view_of_joins_2a', true);
select pg_get_viewdef('view_of_joins_2b', true);
select pg_get_viewdef('view_of_joins_2c', true);
select pg_get_viewdef('view_of_joins_2d', true);
-- Test view decompilation in the face of column addition/deletion/renaming
create table tt2 (a int, b int, c int);