HyukjinKwon opened a new pull request #26642: [SPARK-30003][SQL] Prevent stack over flow in unknown hint resolution URL: https://github.com/apache/spark/pull/26642 ### What changes were proposed in this pull request? This is rather a followup of https://github.com/apache/spark/pull/25464 (see https://github.com/apache/spark/pull/25464/files#r349543286) It will cause an infinite recursion via mapping children - we should return the hint rather than its parent plan in unknown hint resolution. ### Why are the changes needed? Prevent Stack over flow during hint resolution. ### Does this PR introduce any user-facing change? Yes it prevents Stack over flow. It was caused by https://github.com/apache/spark/pull/25464 and this is only in the master. ### How was this patch tested? Unittest was added.
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