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amcheck: Add gin_index_check() to verify GIN index

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Adds a new function, validating two kinds of invariants on a GIN index:

- parent-child consistency: Paths in a GIN graph have to contain
  consistent keys. Tuples on parent pages consistently include tuples
  from child pages; parent tuples do not require any adjustments.

- balanced-tree / graph: Each internal page has at least one downlink,
  and can reference either only leaf pages or only internal pages.

The GIN verification is based on work by Grigory Kryachko, reworked by
Heikki Linnakangas and with various improvements by Andrey Borodin.
Investigation and fixes for multiple bugs by Kirill Reshke.

Author: Grigory Kryachko <GSKryachko@gmail.com>
Author: Heikki Linnakangas <hlinnaka@iki.fi>
Author: Andrey Borodin <amborodin@acm.org>
Reviewed-By: José Villanova <jose.arthur@gmail.com>
Reviewed-By: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-By: Nikolay Samokhvalov <samokhvalov@gmail.com>
Reviewed-By: Andres Freund <andres@anarazel.de>
Reviewed-By: Tomas Vondra <tomas.vondra@enterprisedb.com>
Reviewed-By: Kirill Reshke <reshkekirill@gmail.com>
Reviewed-By: Mark Dilger <mark.dilger@enterprisedb.com>
Reviewed-By: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/45AC9B0A-2B45-40EE-B08F-BDCF5739D1E1%40yandex-team.ru
This commit is contained in:
Tomas Vondra
2025-03-29 15:43:55 +01:00
parent 53a2a1564a
commit 14ffaece0f
9 changed files with 946 additions and 3 deletions
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2
src/tools/pgindent/typedefs.list
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@ -1053,8 +1053,10 @@ GinPageOpaque
GinPageOpaqueData
GinPlaceToPageRC
GinPostingList
GinPostingTreeScanItem
GinQualCounts
GinScanEntry
GinScanItem
GinScanKey
GinScanOpaque
GinScanOpaqueData