| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | James Coleman <jtc331(at)gmail(dot)com> |
| Cc: | Justin Pryzby <pryzby(at)telsasoft(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Rafia Sabih <rafia(dot)pghackers(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Shaun Thomas <shaun(dot)thomas(at)2ndquadrant(dot)com>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Andreas Karlsson <andreas(at)proxel(dot)se> |
| Subject: | Re: [PATCH] Incremental sort (was: PoC: Partial sort) |
| Date: | 2020-04-07 23:58:49 |
| Message-ID: | 20200407235849.o6oge63sd5ginqhc@development |
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| Thread: | |
| Lists: | pgsql-hackers |
On Tue, Apr 07, 2020 at 07:50:26PM -0400, James Coleman wrote:
>On Tue, Apr 7, 2020 at 7:02 PM Tomas Vondra
><tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
>>
>> On Mon, Apr 06, 2020 at 11:25:21PM -0500, Justin Pryzby wrote:
>> >On Mon, Apr 06, 2020 at 09:57:22PM +0200, Tomas Vondra wrote:
>> >> I've pushed the fist part of this patch series - I've reorganized it a
>> >
>> >I scanned through this again post-commit. Find attached some suggestions.
>> >
>>
>> Thanks. The typo fixes seem clear, except for this bit:
>>
>> * If we've set up either of the sort states yet, we need to reset them.
>> * We could end them and null out the pointers, but there's no reason to
>> * repay the setup cost, and because ???? guard setting up pivot comparator
>> * state similarly, doing so might actually cause a leak.
>>
>> I can't figure out what ???? should be. James, do you recall what this
>> should be?
>
>Yep, it's ExecIncrementalSort. If you look for the block guarded by
>`if (fullsort_state == NULL)` you'll see the call to
>preparePresortedCols(), which sets up the pivot comparator state
>referenced by this comment.
>
OK, so it should be "... and because ExecIncrementalSort guard ..."?
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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