From: John Naylor <john.naylor@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Teach TID store to skip bitmap for small numbers of offsets
Date: Mon, 08 Apr 2024 11:48:28 +0000
Message-ID: <E1rtnUC-0017c1-EE@gemulon.postgresql.org> (raw)
Teach TID store to skip bitmap for small numbers of offsets
The header portion of BlocktableEntry has enough padding space for
an array of 3 offsets (1 on 32-bit platforms). Use this space instead
of having a sparse bitmap array. This will take up a constant amount
of space no matter what the offsets are.
Reviewed (in an earlier version) by Masahiko Sawada
Discussion: https://postgr.es/m/CANWCAZYw+_KAaUNruhJfE=h6WgtBKeDG32St8vBJBEY82bGVRQ@mail.gmail.com
Discussion: https://postgr.es/m/CAD21AoBci3Hujzijubomo1tdwH3XtQ9F89cTNQ4bsQijOmqnEw@mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/f35bd9bf359d3d740063997e1cbab9b69df7af99
Modified Files
--------------
src/backend/access/common/tidstore.c | 129 +++++++++++++++------
.../test_tidstore/expected/test_tidstore.out | 28 +++++
.../modules/test_tidstore/sql/test_tidstore.sql | 10 ++
3 files changed, 130 insertions(+), 37 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: john.naylor@postgresql.org, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Teach TID store to skip bitmap for small numbers of offsets
In-Reply-To: <E1rtnUC-0017c1-EE@gemulon.postgresql.org>
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