| From: | Julien Rouhaud <rjuju123(at)gmail(dot)com> |
|---|---|
| To: | Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> |
| Cc: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [Proposal] Make the optimiser aware of partitions ordering |
| Date: | 2017-09-21 09:13:23 |
| Message-ID: | CAOBaU_Y5OKa1xmHi2+quucxMAP=rV1UYfVpF+XWiepPwdhaQQA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Sep 21, 2017 at 10:52 AM, Ashutosh Bapat
<ashutosh(dot)bapat(at)enterprisedb(dot)com> wrote:
> With 9140cf8269b0c4ae002b2748d93979d535891311, we store the
> RelOptInfos of partitions in the RelOptInfo of partitioned table. For
> range partitioned table without default partition, they are arranged
> in the ascending order of partition bounds. This patch may avoid
> MergeAppend if the sort keys match partition keys by creating an
> Append path by picking sorted paths from partition RelOptInfos in
> order. You may use slightly modified version of
> add_paths_to_append_rel().
Yes, I just saw this commit this morning, and this is exactly what I
was missing, thanks for the pointer and the patch!
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