pgsql: Deduplicate PageIsNew() check in lazy_scan_heap().

From: Andres Freund <andres(at)anarazel(dot)de>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Deduplicate PageIsNew() check in lazy_scan_heap().
Date: 2020-03-30 21:10:56
Message-ID: E1jJ1gO-0003wo-Sb@gemulon.postgresql.org
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Deduplicate PageIsNew() check in lazy_scan_heap().

The recheck isn't needed anymore, as RelationGetBufferForTuple() now
extends the relation with RBM_ZERO_AND_LOCK. Previously we needed to
handle the fact that relation extension extended the relation and then
separately acquired a lock on the page - while expecting that the page
is empty.

Reported-By: Ranier Vilela
Discussion: https://postgr.es/m/CAEudQArA_=J0D5T258xsCY6Xtf6wiH4b=QDPDgVS+WZUN10WDw@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d4b34f60c54904bb3647911dfd9d79d8a4fab430

Modified Files
--------------
src/backend/access/heap/vacuumlazy.c | 32 +++++++++++---------------------
1 file changed, 11 insertions(+), 21 deletions(-)

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