xuanyuanking opened a new pull request #26229: [SPARK-21492][SQL][Follow Up] Reimplement UnsafeExternalRowSorter in database style iterator URL: https://github.com/apache/spark/pull/26229 ### What changes were proposed in this pull request? Reimplement the iterator in UnsafeExternalRowSorter in database style. This can be done by reusing the `RowIterator` in our code base. ### Why are the changes needed? During the job in #26164, after involving a var `isReleased` in `hasNext`, there's possible that `isReleased` is false when calling `hasNext`, but it becomes true before calling `next`. A safer way is using database-style iterator: `advanceNext` and `getRow`. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Existing UT.
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