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_17_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/2dcac93c00655cc62e8105dc12b6cd302d2c0625 Modified Files -------------- src/backend/executor/nodeModifyTable.c | 5 +++++ src/test/isolation/expected/merge-update.out | 33 ++++++++++++++++++++++++++++ src/test/isolation/specs/merge-update.spec | 2 ++ 3 files changed, 40 insertions(+)
