| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: gincostestimate |
| Date: | 2011-04-21 23:27:22 |
| Message-ID: | 4450.1303428442@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Jeff Janes <jeff(dot)janes(at)gmail(dot)com> writes:
> The problem is that numEntries in src/backend/utils/adt/selfuncs.c is
> zero and eventually causes a division by zero and a cost estimate of
> nan.
> ...
> I don't know what the solution is. Simply setting numEntries to 1 if
> ginStats.nEntries zero solves this particular problem, but I don't
> know what other consequences it might have.
Yeah, I think clamping numEntries to a minimum value of 1 is a
reasonable thing to do. Will fix.
regards, tom lane
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