Trigger function returning null

From: Thomas Hallgren <thhal(at)mailblocks(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Trigger function returning null
Date: 2004-08-13 11:25:19
Message-ID: cfi8os$joo$1@sea.gmane.org
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In backend/commands/trigger.c the following can be found:

/*
* Trigger protocol allows function to return a null pointer,
* but NOT to set the isnull result flag.
*/
if (fcinfo.isnull)
ereport(ERROR,

Why?

Regards,

Thomas Hallgren

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