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Fix incorrect hash equality operator bug in Memoize

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In v14, because we don't have a field in RestrictInfo to cache both the
left and right type's hash equality operator, we just restrict the scope
of Memoize to only when the left and right types of a RestrictInfo are the
same.

In master we add another field to RestrictInfo and cache both hash
equality operators.

Reported-by: Jaime Casanova
Author: David Rowley
Discussion: https://postgr.es/m/20210929185544.GB24346%40ahch-to
Backpatch-through: 14
This commit is contained in:
David Rowley
2021-11-08 14:40:33 +13:00
parent e2fbb88372
commit 39a3105678
6 changed files with 54 additions and 22 deletions
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5
src/include/nodes/pathnodes.h
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@ -2122,8 +2122,9 @@ typedef struct RestrictInfo
Selectivity left_mcvfreq; /* left side's most common val's freq */
Selectivity right_mcvfreq; /* right side's most common val's freq */
/* hash equality operator used for memoize nodes, else InvalidOid */
Oid hasheqoperator;
/* hash equality operators used for memoize nodes, else InvalidOid */
Oid left_hasheqoperator;
Oid right_hasheqoperator;
} RestrictInfo;
/*