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### What changes were proposed in this pull request? This PR changes subquery reuse in Adaptive Query Execution from compile-time static reuse to execution-time dynamic reuse. This PR adds a `ReuseAdaptiveSubquery` rule that applies to a query stage after it is created and before it is executed. The new dynamic reuse enables subqueries to be reused across all different subquery levels. ### Why are the changes needed? This is an improvement to the current subquery reuse in Adaptive Query Execution, which allows subquery reuse to happen in a lazy fashion as well as at different subquery levels. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Passed existing tests. Closes #25471 from maryannxue/aqe-dynamic-sub-reuse. Authored-by: maryannxue <maryannxue@apache.org> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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