Horton

Fix ALTER DEFAULT PRIVILEGES with duplicated objects

Michael Paquier <michael@paquier.xyz>

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Commit: 0ddb529cf3e25afd94abf85aa3688b9d9063897c
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-01-20T02:39:35Z
Releases: 9.5.25 
Fix ALTER DEFAULT PRIVILEGES with duplicated objects

Specifying duplicated objects in this command would lead to unique
constraint violations in pg_default_acl or "tuple already updated by
self" errors.  Similarly to GRANT/REVOKE, increment the command ID after
each subcommand processing to allow this case to work transparently.

A regression test is added by tweaking one of the existing queries of
privileges.sql to stress this case.

Reported-by: Andrus
Author: Michael Paquier
Reviewed-by: Álvaro Herrera
Discussion: https://postgr.es/m/ae2a7dc1-9d71-8cba-3bb9-e4cb7eb1f44e@hot.ee
Backpatch-through: 9.5

Files

PathChange+/−
src/backend/catalog/aclchk.c modified +3 −0
src/test/regress/expected/privileges.out modified +2 −1
src/test/regress/sql/privileges.sql modified +2 −1

Discussion