| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
| Cc: | Thomas Kellerer <spam_eater(at)gmx(dot)net>, pgsql-performance(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Bloom index cost model seems to be wrong |
| Date: | 2019-02-12 21:17:23 |
| Message-ID: | 3997.1550006243@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-performance |
Jeff Janes <jeff(dot)janes(at)gmail(dot)com> writes:
> In order for bloom (or any other users of CREATE ACCESS METHOD, if there
> are any) to have a fighting chance to do better, I think many of selfuncs.c
> currently private functions would have to be declared in some header file,
> perhaps utils/selfuncs.h. But that then requires a cascade of other
> inclusions. Perhaps that is why it was not done.
I'm just in the midst of refactoring that stuff, so if you have
suggestions, let's hear 'em.
It's possible that a good cost model for bloom is so far outside
genericcostestimate's ideas that trying to use it is not a good
idea anyway.
regards, tom lane
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