Horton

pgsql: Introduce hash_search_with_hash_value() function

Alexander Korotkov <akorotkov@postgresql.org>

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From: Alexander Korotkov <akorotkov@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Date: 2024-08-07T04:08:11Z
Lists: pgsql-hackers 
Introduce hash_search_with_hash_value() function

This new function iterates hash entries with given hash values.  This function
is designed to avoid full sequential hash search in the syscache invalidation
callbacks.

Discussion: https://postgr.es/m/5812a6e5-68ae-4d84-9d85-b443176966a1%40sigaev.ru
Author: Teodor Sigaev
Reviewed-by: Aleksander Alekseev, Tom Lane, Michael Paquier, Roman Zharkov
Reviewed-by: Andrei Lepikhov

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d0f020037e19c33c74d683eb7e0c7cc5725294b4

Modified Files
--------------
src/backend/utils/hash/dynahash.c | 38 ++++++++++++++++++++++++++++++++++++++
src/include/utils/hsearch.h       |  5 +++++
2 files changed, 43 insertions(+)

Commits

  1. Add a caveat to hash_seq_init_with_hash_value() header comment

  2. Introduce hash_search_with_hash_value() function