Fix MERGE command tag for cross-partition updates.
This ensures that the row count in the command tag for a MERGE is
correctly computed. Previously, if MERGE updated a partitioned table,
the row count would be incorrect if any row was moved to a different
partition, since such updates were counted twice.
Back-patch to v15, where MERGE was introduced.
Discussion: https://postgr.es/m/CAEZATCWRMG7XX2QEsVL1LswmNo2d_YG8tKTLkpD3=Lp644S7rg@mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/80a48e0f21c51ed65fe647b18019ab6f8eab15cd
Modified Files
--------------
src/backend/executor/nodeModifyTable.c | 2 +-
src/test/regress/expected/merge.out | 16 ++++++++++++++++
src/test/regress/sql/merge.sql | 11 +++++++++++
3 files changed, 28 insertions(+), 1 deletion(-)
