Reset relhassubclass upon attaching table as a partition
We don't allow inheritance parents as partitions, and have checks to
prevent this; but if a table _was_ in the past an inheritance parents
and all their children are removed, the pg_class.relhassubclass flag
may remain set, which confuses the partition pruning code (most
obviously, it results in an assertion failure; in production builds it
may be worse.)
Fix by resetting relhassubclass on attach.
Backpatch to all supported versions.
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/18550-d5e047e9a897a889@postgresql.org
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/3dd637f3d5997eb5ef3ccf8787e6fa091d93cd0c
Modified Files
--------------
src/backend/catalog/heap.c | 8 ++++++++
src/test/regress/expected/alter_table.out | 10 +++++++++-
src/test/regress/sql/alter_table.sql | 7 +++++++
3 files changed, 24 insertions(+), 1 deletion(-)