From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Shigeru HANADA <shigeru(dot)hanada(at)gmail(dot)com> |
Cc: | Etsuro Fujita <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: WIP: Collecting statistics on CSV file data |
Date: | 2012-04-06 19:19:51 |
Message-ID: | 12199.1333739991@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Shigeru HANADA <shigeru(dot)hanada(at)gmail(dot)com> writes:
> Just after my post, Fujita-san posted another v7 patch[1], so I merged
> v7 patches into v8 patch.
I've committed a modified version of this, but right after pushing it
I had a better idea about what the AnalyzeForeignTable API should do.
An issue that I'd not previously figured out is how analysis of an
inheritance tree could deal with foreign-table members, because it wants
to estimate the members' sizes before collecting the actual sample rows.
However, given that we've got the work split into a precheck phase and
a sample collection phase, that's not hard to solve: we could insist
that the FDW give back a size estimate in the precheck phase not the
sample collection phase. I'm off to fix that up ...
regards, tom lane
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