Release memory allocated by dependency_degree Calculating degree of a functional dependency may allocate a lot of memory - we have released mot of the explicitly allocated memory, but e.g. detoasted varlena values were left behind. That may be an issue, because we consider a lot of dependencies (all combinations), and the detoasting may happen for each one again.
Fixed by calling dependency_degree() in a dedicated context, and resetting it after each call. We only need the calculated dependency degree, so we don't need to copy anything. Backpatch to PostgreSQL 10, where extended statistics were introduced. Backpatch-through: 10 Discussion: https://www.postgresql.org/message-id/20210915200928.GP831%40telsasoft.com Branch ------ REL_11_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/4487a7def3ae6efa79c545c3edc03ea97f446e36 Modified Files -------------- src/backend/statistics/dependencies.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-)
