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Diffstat (limited to 'src/backend/optimizer/path/allpaths.c')
| -rw-r--r-- | src/backend/optimizer/path/allpaths.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index 1d7e20c1e8b..fc618f72d1c 100644 --- a/src/backend/optimizer/path/allpaths.c +++ b/src/backend/optimizer/path/allpaths.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.150 2006/08/02 01:59:45 joe Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.151 2006/08/10 02:36:28 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -813,6 +813,10 @@ recurse_pushdown_safe(Node *setOp, Query *topquery, * Compare tlist's datatypes against the list of set-operation result types. * For any items that are different, mark the appropriate element of * differentTypes[] to show that this column will have type conversions. + * + * We don't have to care about typmods here: the only allowed difference + * between set-op input and output typmods is input is a specific typmod + * and output is -1, and that does not require a coercion. */ static void compare_tlist_datatypes(List *tlist, List *colTypes, |