diff options
| author | Peter Eisentraut | 2021-03-31 15:09:24 +0000 |
|---|---|---|
| committer | Peter Eisentraut | 2021-03-31 15:10:50 +0000 |
| commit | 055fee7eb4dcc78e58672aef146334275e1cc40d (patch) | |
| tree | 2034e69c471453e9aea59712b09d3fed95bce330 /src/include/nodes/parsenodes.h | |
| parent | 27e1f14563cf982f1f4d71e21ef247866662a052 (diff) | |
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 <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: https://www.postgresql.org/message-id/flat/[email protected]
Diffstat (limited to 'src/include/nodes/parsenodes.h')
| -rw-r--r-- | src/include/nodes/parsenodes.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h index 334262b1dd8..7960cfe1a82 100644 --- a/src/include/nodes/parsenodes.h +++ b/src/include/nodes/parsenodes.h @@ -1070,6 +1070,13 @@ typedef struct RangeTblEntry List *joinrightcols; /* right-side input column numbers */ /* + * join_using_alias is an alias clause attached directly to JOIN/USING. It + * is different from the alias field (below) in that it does not hide the + * range variables of the tables being joined. + */ + Alias *join_using_alias; + + /* * Fields valid for a function RTE (else NIL/zero): * * When funcordinality is true, the eref->colnames list includes an alias |