Thread: pgsql: Make index_set_state_flags() transactional

pgsql: Make index_set_state_flags() transactional

From
Michael Paquier
Date:
Make index_set_state_flags() transactional

3c84046 is the original commit that introduced index_set_state_flags(),
where the presence of SnapshotNow made necessary the use of an in-place
update.  SnapshotNow has been removed in 813fb03, so there is no actual
reasons to not make this operation transactional.

As reported by Andrey, it is possible to trigger the assertion of this
routine expecting no transactional updates when switching the pg_index
state flags, using a predicate mark as immutable but calling stable or
volatile functions.  83158f7 has been around for a couple of months on
HEAD now with no issues found related to it, so it looks safe enough for
a backpatch.

Reported-by: Andrey Lepikhov
Author: Michael Paquier
Reviewed-by: Anastasia Lubennikova
Discussion: https://postgr.es/m/20200903080440.GA8559@paquier.xyz
Discussion: https://postgr.es/m/9b905019-5297-7372-0ad2-e1a4bb66a719@postgrespro.ru
Backpatch-through: 9.6

Branch
------
REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/08acba558bba3e67ce798fcc26816878a8a6b114

Modified Files
--------------
src/backend/catalog/index.c | 19 ++++---------------
1 file changed, 4 insertions(+), 15 deletions(-)