Optimizer fixes cte multi index#5512

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jussisaurio wants to merge 7 commits intomainfrom

optimizer-fixes-cte-multi-index

Commits on Feb 21, 2026

fix: unwrap parenthesized expressions before splitting predicates at AND boundaries

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optimizer: add estimated_output_rows field to SelectPlan

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optimizer: enable multi-index OR scans during joins

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optimizer: propagate multi-index OR output cardinality

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optimizer: propagate CTE/subquery cardinality estimates to outer queries

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tests: add graph traversal regression tests with TEXT primary keys

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fix: MVCC cursor ignored left join null flag
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