| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] path toward faster partition pruning |
| Date: | 2018-04-07 03:46:22 |
| Message-ID: | 20180407034622.2zjrjnckhqw5lnb6@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2018-04-06 23:41:22 -0400, Tom Lane wrote:
> David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> writes:
> > Sounds like you're saying that if we have too many alternative files
> > then there's a chance that one could pass by luck.
>
> Yeah, exactly: it passed, but did it pass for the right reason?
>
> If there's just two expected-files, it's likely not a big problem,
> but if you have a bunch it's something to worry about.
There should be only two alternatives, given our current hashing
implementation, right?
Greetings,
Andres Freund
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