| From: | Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at> |
|---|---|
| To: | "'pinker *EXTERN*'" <pinker(at)onet(dot)eu>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Shouldn't "WHEN (OLD.* IS DISTINCT FROM NEW.*)" clause be independent from data type? |
| Date: | 2015-09-17 13:32:25 |
| Message-ID: | A737B7A37273E048B164557ADEF4A58B50FA8609@ntex2010i.host.magwien.gv.at |
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| Lists: | pgsql-general |
pinker wrote:
> I've tried to write audit trigger which fires only when data changed, so I used "WHEN (OLD.* IS
> DISTINCT FROM NEW.*)" clause as described in documentation
> <http://www.postgresql.org/docs/9.4/static/sql-createtrigger.html> . Should this clause be independent
> from data type? because an error occurs when I'm trying to modify row with point data type: ERROR:
> could not identify an equality operator for type point
I guess it is dependent on data type as it requires an equality operator,
and type "point" doesn't have one.
You'd have to hand-roll a comparison in this case, probably using the
"same as" operator "~=".
Yours,
Laurenz Albe
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