maryannxue opened a new pull request #25764: [SPARK-29060][SQL] Add tree traversal helper for adaptive spark plans URL: https://github.com/apache/spark/pull/25764 ### What changes were proposed in this pull request? This PR adds a utility class `AdaptiveSparkPlanHelper` which provides methods related to tree traversal of an `AdaptiveSparkPlanExec` plan. Unlike their counterparts in `TreeNode` or `QueryPlan`, these methods traverse down leaf nodes of adaptive plans, i.e., `AdaptiveSparkPlanExec` and `QueryStageExec`. ### Why are the changes needed? This utility class can greatly simplify tree traversal code for adaptive spark plans. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Refined `AdaptiveQueryExecSuite` with the help of the new utility methods.
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