| From: | Emre Hasegeli <emre(at)hasegeli(dot)com> |
|---|---|
| To: | Oleksii Kliukin <alexk(at)hintbits(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Álvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: rows estimate in explain analyze for the BRIN index |
| Date: | 2015-12-30 17:38:56 |
| Message-ID: | CAE2gYzwT0uEWitsOBBM4cM9cx_f8GBxPdH47YapCtGHyn0APSQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
> which is much closer to the actual number of rows removed by the index
> recheck + the one left.
Is it better to be closer? We are saying those are the "actual"
values not the estimates. If we cannot provide the actual rows, I
think it is better to provide nothing. Something closer to the
reality would create more confusion. Maybe, we just just return the
number of blocks, and put somewhere a note about it. The actual row
count is already available on the upper part of the plan.
By the way, the estimation is a bigger problem than that. Please see
my patch [1] about it.
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