Horton

Re: Yet another fast GiST build

Peter Geoghegan <pg@bowt.ie>

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From: Peter Geoghegan <pg@bowt.ie>
To: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: Andrey Borodin <x4mmm@yandex-team.ru>, Tom Lane <tgl@sss.pgh.pa.us>, Justin Pryzby <pryzby@telsasoft.com>, Darafei Komяpa Praliaskouski <me@komzpa.net>, Pavel Borisov <pashkin.elfe@gmail.com>, Thomas Munro <thomas.munro@gmail.com>, Michael Paquier <michael@paquier.xyz>, Alexander Korotkov <a.korotkov@postgrespro.ru>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2021-01-13T23:47:52Z
Lists: pgsql-hackers 
On Tue, Jan 12, 2021 at 5:49 AM Heikki Linnakangas <hlinnaka@iki.fi> wrote:
> I did a bit of cleanup on the function signature. The .sql script
> claimed that gist_page_items() took bytea as argument, but in reality it
> was a relation name, as text. I changed it so that it takes a page image
> as argument, instead of reading the block straight from the index.
> Mainly to make it consistent with brin_page_items(), if it wasn't for
> that precedence I might've gone either way on it.

BTW it would be nice if gist_page_items() had a "dead" boolean output
argument for the item's LP_DEAD bit, just like bt_page_items(). I plan
on adding some testing for GiST's opportunistic index deletion soon. I
may also add some of the same enhancements that nbtree got today
(following commit d168b666).

This feature was originally heavily based on the nbtree LP_DEAD
deletion mechanism (now called simple deletion), and I see no reason
(or at least no good reason) why it shouldn't be possible to keep it
in sync (except maybe with bottom-up deletion, where that it at least
isn't straightforward/mechanical).

-- 
Peter Geoghegan

Commits

  1. Add sortsupport for gist_btree opclasses, for faster index builds.

  2. pageinspect: Fix relcache leak in gist_page_items().

  3. Fix test failure with wal_level=minimal.

  4. Enhance nbtree index tuple deletion.

  5. Fix portability issues in the new gist pageinspect test.

  6. Add functions to 'pageinspect' to inspect GiST indexes.

  7. Fix missing validation for the new GiST sortsupport functions.

  8. Fix compilation warning in xlog.c

  9. Set right-links during sorted GiST index build.

  10. Fix checksum calculation in the new sorting GiST build.

  11. Add support for building GiST index by sorting.