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    Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be
    Tom Lane authored 
    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.
    7fc0f062
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    user avatar 7fc0f062
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