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Flush Memoize cache when non-key parameters change

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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
This commit is contained in:
David Rowley
2021-11-24 14:56:18 +13:00
parent e502150f7d
commit 1050048a31
9 changed files with 142 additions and 3 deletions
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2
src/include/nodes/execnodes.h
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@ -2113,6 +2113,8 @@ typedef struct MemoizeState
* by bit, false when using hash equality ops */
MemoizeInstrumentation stats; /* execution statistics */
SharedMemoizeInfo *shared_info; /* statistics for parallel workers */
Bitmapset *keyparamids; /* Param->paramids of expressions belonging to
* param_exprs */
} MemoizeState;
/* ----------------