zsxwing opened a new pull request #26077: [SPARK-29413][CORE] A better parmap method signature URL: https://github.com/apache/spark/pull/26077 ### What changes were proposed in this pull request? This PR updates the `parmap` method signature to return the same type of `input` to make the method more flexible. ### Why are the changes needed? `parmap` will be more flexible similar to `Future.sequence`. ### Does this PR introduce any user-facing change? No. This PR updates an internal method. ### How was this patch tested? The new test added in this PR.
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