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author | Tom Lane | 2010-11-12 20:14:51 +0000 |
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committer | Tom Lane | 2010-11-12 20:19:08 +0000 |
commit | faea08353120ed455df84ba30c07505248f5332b (patch) | |
tree | 044c1d264a28868582c478ae08840acb6fa90f8e /src/backend/access/gist/gistproc.c | |
parent | f5cf3ce7a47bad3c5d7ae59d9e302ee55141439d (diff) |
Fix old oversight in const-simplification of COALESCE() expressions.
Once we have found a non-null constant argument, there is no need to
examine additional arguments of the COALESCE. The previous coding got it
right only if the constant was in the first argument position; otherwise
it tried to simplify following arguments too, leading to unexpected
behavior like this:
regression=# select coalesce(f1, 42, 1/0) from int4_tbl;
ERROR: division by zero
It's a minor corner case, but a bug is a bug, so back-patch all the way.
Diffstat (limited to 'src/backend/access/gist/gistproc.c')
0 files changed, 0 insertions, 0 deletions