branch-4.1: [fix](mv) Avoid unioning query-unused MV partitions #63081#63706
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Problem Summary:
In MV union rewrite, rewrittenPlanUsePartitionNameSet may contain extra
MV partitions outside the query range. For example, the query only uses
{p20260401, p20260402, p20260403}, but the rewritten MV scan may select
partitions from p20260301 to p20260428. The old compensation logic
mapped all removed MV partitions back to base table partitions and added
them into baseTableNeedUnionPartitionNameSet. This created unnecessary
base table union branches, increased the MV candidate cost, and could
make explain show MaterializedViewRewriteSuccessButNotChose.
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Co-authored-by: yangtao555 <yangtao555@jd.com>
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yiguolei
approved these changes
May 27, 2026
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Cherry-picked from #63081