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Flush Memoize cache when non-key parameters change, take 2

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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 23:29:14 +13:00
parent fb5961fd13
commit 411137a429
12 changed files with 145 additions and 3 deletions
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src/backend/nodes/copyfuncs.c
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@ -973,6 +973,7 @@ _copyMemoize(const Memoize *from)
COPY_SCALAR_FIELD(singlerow);
COPY_SCALAR_FIELD(binary_mode);
COPY_SCALAR_FIELD(est_entries);
COPY_BITMAPSET_FIELD(keyparamids);
return newnode;
}