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23 results

nodeModifyTable.c

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    • Tom Lane's avatar
      7fc0f062
      Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be · 7fc0f062
      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
      History
      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.
    nodeModifyTable.c 29.14 KiB