Thread: pgsql: Flush Memoize cache when non-key parameters change
Flush Memoize cache when non-key parameters change It's possible that a subplan below a Memoize node contains a parameter from above the Memoize node. If this parameter changes then cache entries may become out-dated due to the new parameter value. Previously Memoize was mistakenly not aware of this. We fix this here by flushing the cache whenever a parameter that's not part of the cache key changes. Bug: #17213 Reported by: Elvis Pranskevichus Author: David Rowley Discussion: https://postgr.es/m/17213-988ed34b225a2862@postgresql.org Backpatch-through: 14, where Memoize was added Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/1050048a315790a505465bfcceb26eaf8dbc7e2e Modified Files -------------- src/backend/executor/nodeMemoize.c | 38 ++++++++++++++++++++++++++++++++ src/backend/nodes/bitmapset.c | 2 ++ src/backend/optimizer/plan/createplan.c | 10 ++++++--- src/backend/optimizer/util/clauses.c | 31 ++++++++++++++++++++++++++ src/include/nodes/execnodes.h | 2 ++ src/include/nodes/plannodes.h | 1 + src/include/optimizer/clauses.h | 2 ++ src/test/regress/expected/memoize.out | 39 +++++++++++++++++++++++++++++++++ src/test/regress/sql/memoize.sql | 20 +++++++++++++++++ 9 files changed, 142 insertions(+), 3 deletions(-)