Re: BUG #6123: DELETE fails if before trigger causes another trigger to UPDATE

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #6123: DELETE fails if before trigger causes another trigger to UPDATE
Date: 2011-07-19 21:30:47
Message-ID: 5769.1311111047@sss.pgh.pa.us
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"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> [ circular trigger relationships ]

> I expect the DELETE from a to delete related b record(s) and then succeed.
> Instead the UPDATE in b_del_trig causes delete of a to silently fail.

The update causes the already-selected target row version of the DELETE
to be obsoleted, so heap_delete finds it has nothing to do. I'm
disinclined to mess with that logic.

regards, tom lane

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