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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2009-11-20 20:38:12 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2009-11-20 20:38:12 +0000 |
| commit | 7fc0f06221d22632daa3ff8b70919b43e8a242ca (patch) | |
| tree | a2ec73a6256c30ba9cb2d4723868978c5136ba5e /src/backend/executor/nodeLimit.c | |
| parent | 201a45c4fa23c485cf2e14ac9db8064b2c559fdc (diff) | |
| download | postgresql-7fc0f06221d22632daa3ff8b70919b43e8a242ca.tar.gz postgresql-7fc0f06221d22632daa3ff8b70919b43e8a242ca.zip | |
Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be
checked to determine whether the trigger should be fired.
For BEFORE triggers this is mostly a matter of spec compliance; but for AFTER
triggers it can provide a noticeable performance improvement, since queuing of
a deferred trigger event and re-fetching of the row(s) at end of statement can
be short-circuited if the trigger does not need to be fired.
Takahiro Itagaki, reviewed by KaiGai Kohei.
Diffstat (limited to 'src/backend/executor/nodeLimit.c')
0 files changed, 0 insertions, 0 deletions