| From: | Etsuro Fujita <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Problems with plan estimates in postgres_fdw |
| Date: | 2019-03-06 13:03:18 |
| Message-ID: | 5C7FC516.10100@lab.ntt.co.jp |
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| Lists: | pgsql-hackers |
(2019/02/22 17:17), Etsuro Fujita wrote:
> (2019/02/21 6:19), Jeff Janes wrote:
>> With your tweaks, I'm still not seeing the ORDER-less LIMIT get pushed
>> down when using use_remote_estimate in a simple test case, either with
>> this set of patches, nor in the V4 set. However, without
>> use_remote_estimate, the LIMIT is now getting pushed with these patches
>> when it does not in HEAD.
>
> Good catch! I think the root cause of that is: when using
> use_remote_estimate, remote estimates obtained through remote EXPLAIN
> are rounded off to two decimal places, which I completely overlooked.
> Will fix. I think I can post a new version early next week.
Done. Please see [1]. Sorry for the delay.
Best regards,
Etsuro Fujita
[1] https://www.postgresql.org/message-id/5C7FC458.4020400%40lab.ntt.co.jp
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