release-20.2: opt: do not mutate GenerateConstrainedScans input filters #55394
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This commit fixes a bug in GenerateConstrainedScans which can cause incorrect query results in tables with a partial index. Filters reduced while proving implication of a partial index would mutate the input filters. These filters would remain mutated for future iterations over other indexes, causing constrained scans to be created without these necessary filters. Fixes cockroachdb#55387 Release justification: This fixes a critical correctness bug for a new feature, partial indexes. Release note (bug fix): A bug was fixed that caused incorrect query results on tables with partial indexes. This bug did not affect any queries involving tables without partial indexes.
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RaduBerinde
approved these changes
Oct 9, 2020
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Backport 1/1 commits from #55391.
/cc @cockroachdb/release
This commit fixes a bug in GenerateConstrainedScans which can cause
incorrect query results in tables with a partial index. Filters reduced
while proving implication of a partial index would mutate the input
filters. These filters would remain mutated for future iterations over
other indexes, causing constrained scans to be created without these
necessary filters.
Fixes #55387
Release justification: This fixes a critical correctness bug for a new
feature, partial indexes.
Release note (bug fix): A bug was fixed that caused incorrect query
results on tables with partial indexes. This bug did not affect any
queries involving tables without partial indexes.