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| 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/backend/nodes/readfuncs.c | |
| 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/backend/nodes/readfuncs.c')
| -rw-r--r-- | src/backend/nodes/readfuncs.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c index 6a563e99033..4767e7092d7 100644 --- a/src/backend/nodes/readfuncs.c +++ b/src/backend/nodes/readfuncs.c @@ -1346,6 +1346,7 @@ _readJoinExpr(void) READ_NODE_FIELD(larg); READ_NODE_FIELD(rarg); READ_NODE_FIELD(usingClause); + READ_NODE_FIELD(join_using_alias); READ_NODE_FIELD(quals); READ_NODE_FIELD(alias); READ_INT_FIELD(rtindex); @@ -1449,6 +1450,7 @@ _readRangeTblEntry(void) READ_NODE_FIELD(joinaliasvars); READ_NODE_FIELD(joinleftcols); READ_NODE_FIELD(joinrightcols); + READ_NODE_FIELD(join_using_alias); break; case RTE_FUNCTION: READ_NODE_FIELD(functions); |