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mariadb/sql
Sergei Petrunia 240b4e83e0 MDEV-37913: disable_index_merge_plans causes SELECT data loss when more than 100 ORs
(Variant 2)
SEL_TREE* tree_or(SEL_TREE *X, SEL_TREE *Y) tries to conserve memory by
reusing object *X for the return value when possible.

MDEV-34620 has added logic to disable construction of index_merge plans
for N-way ORs with large N. That logic interfered with object reuse logic:

for the parameters of:
X = SEL_TREE{ trees=[key1_treeA, key2_treeB]}
Y = SEL_TREE{ trees=[key1_treeC]}

we would decide to reuse object X.
For key1, we would produce key_or(key1_treeA, key1_treeC)
but key2_treeB would be just left there.
Then, we would construct a range scan from key2_treeB.

Fixed by moving the "disable building index_merge plans" logic into a
location where it would not interfere with object reuse logic.
2025-11-01 11:04:46 +01:00
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