Horton

Re: [HACKERS] [WIP] Effective storage of duplicates in B-tree index.

Peter Geoghegan <pg@bowt.ie>

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From: Peter Geoghegan <pg@bowt.ie>
To: Anastasia Lubennikova <a.lubennikova@postgrespro.ru>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Юрий Соколов <funny.falcon@gmail.com>
Date: 2020-02-26T22:43:27Z
Lists: pgsql-hackers 
On Mon, Feb 24, 2020 at 4:54 PM Peter Geoghegan <pg@bowt.ie> wrote:
> Attached is v34, which has this change. My plan is to commit something
> very close to this on Wednesday morning (barring any objections).

Pushed.

I'm going to delay committing the pageinspect patch until tomorrow,
since I haven't thought about that aspect of the project in a while.
Seems like a good idea to go through it one more time, once it's clear
that the buildfarm is stable. The buildfarm appears to be stable now,
though there was an issue with a compiler warning earlier. I quickly
pushed a fix for that, and can see that longfin is green/passing now.

Thanks for sticking with this project, Anastasia.
-- 
Peter Geoghegan

Commits

  1. Teach pageinspect about nbtree deduplication.

  2. Doc: Fix deduplicate_items index term.

  3. Revise BTP_HAS_GARBAGE nbtree VACUUM comments.

  4. Remove unneeded "pin scan" nbtree VACUUM code.

  5. Cleanup code in reloptions.h regarding reloption handling

  6. Catch invalid typlens in a couple of places

  7. Compute XID horizon for page level index vacuum on primary.

  8. Make heap TID a tiebreaker nbtree index column.

  9. Avoid pin scan for replay of XLOG_BTREE_VACUUM in all cases

  10. Revert buggy optimization of index scans

  11. Restructure index access method API to hide most of it at the C level.

  12. Reduce pinning and buffer content locking for btree scans.

  13. Avoid scanning nulls at the beginning of a btree index scan.