Set PD_ALL_VISIBLE and visibility map bits in COPY FREEZE
authorTomas Vondra <tomas.vondra@postgresql.org>
Sun, 17 Jan 2021 21:11:39 +0000 (22:11 +0100)
committerTomas Vondra <tomas.vondra@postgresql.org>
Sun, 17 Jan 2021 21:28:26 +0000 (22:28 +0100)
commit7db0cd2145f2bce84cac92402e205e4d2b045bf2
tree478bd930393c975061012a742250bf72a8d38c1c
parent0c7d3bb99f72d66ec6ac63aee4c5fe6d683eee86
Set PD_ALL_VISIBLE and visibility map bits in COPY FREEZE

Make sure COPY FREEZE marks the pages as PD_ALL_VISIBLE and updates the
visibility map. Until now we only marked individual tuples as frozen,
but page-level flags were not updated, so the first VACUUM after the
COPY FREEZE had to rewrite the whole table.

This is a fairly old patch, and multiple people worked on it. The first
version was written by Jeff Janes, and then reworked by Pavan Deolasee
and Anastasia Lubennikova.

Author: Anastasia Lubennikova, Pavan Deolasee, Jeff Janes
Reviewed-by: Kuntal Ghosh, Jeff Janes, Tomas Vondra, Masahiko Sawada,
             Andres Freund, Ibrar Ahmed, Robert Haas, Tatsuro Ishii,
             Darafei Praliaskouski
Discussion: https://postgr.es/m/CABOikdN-ptGv0mZntrK2Q8OtfUuAjqaYMGmkdU1dCKFtUxVLrg@mail.gmail.com
Discussion: https://postgr.es/m/CAMkU%3D1w3osJJ2FneELhhNRLxfZitDgp9FPHee08NT2FQFmz_pQ%40mail.gmail.com
contrib/pg_visibility/expected/pg_visibility.out
contrib/pg_visibility/sql/pg_visibility.sql
src/backend/access/heap/heapam.c
src/backend/access/heap/hio.c
src/include/access/heapam_xlog.h