Fix catalog lookup due to wrong snapshot for subtransactions during decoding.
In commit 272248a0c, we fixed the catalog lookup due to the wrong snapshot
for transactions and subtransactions during decoding. We failed to
consider the case where top-level xact is already marked as containing
catalog change but its subtransaction is not yet marked as containing
catalog change even though it contained such a change.
This can happen when during decoding, none of the WAL records from the
subtransaction was decoded and top-level xact contains a DDL.
We fix it by marking the transaction and all its subtransactions as
containing catalog changes if the top-level xact contains any catalog
change and it is present in the initial running xacts array.
This fix is required only for 14 and 15 because in prior branches we
already always mark the transaction and all its subtransactions as
containing catalog changes in the same case. In 16 and above, we preserve
the list of transaction IDs and sub-transaction IDs, that have modified
catalogs and are running during snapshot serialization, to the serialized
snapshot (see commit 7f13ac8123).
Author: Fei Changhong
Reviewed-by: Amit Kapila, Hayato Kuroda, Andy Fan
Discussion: https://postgr.es/m/18280-4c8060178cb41750@postgresql.org
Branch
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REL_15_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/b793a416bfa8448a6be6deeb3b962c1173efa613
Modified Files
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.../expected/catalog_change_snapshot.out | 44 ++++++++++++++++++++++
.../specs/catalog_change_snapshot.spec | 15 ++++++++
src/backend/replication/logical/snapbuild.c | 10 +++--
3 files changed, 65 insertions(+), 4 deletions(-)