Fix handling of updated tuples in the MERGE statement This branch missed the IsolationUsesXactSnapshot() check. That led to EPQ on repeatable read and serializable isolation levels. This commit fixes the issue and provides a simple isolation check for that. Backpatch through v15 where MERGE statement was introduced.
Reported-by: Tender Wang <[email protected]> Discussion: https://postgr.es/m/CAPpHfdvzZSaNYdj5ac-tYRi6MuuZnYHiUkZ3D-AoY-ny8v%2BS%2Bw%40mail.gmail.com Author: Tender Wang <[email protected]> Reviewed-by: Dean Rasheed <[email protected]> Backpatch-through: 15 Branch ------ REL_16_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/f6e63d4b8b2ec5ff011c87f79f3efc8abe921263 Modified Files -------------- src/backend/executor/nodeModifyTable.c | 5 +++++ src/test/isolation/expected/merge-update.out | 25 +++++++++++++++++++++++++ src/test/isolation/specs/merge-update.spec | 2 ++ 3 files changed, 32 insertions(+)
