henrydavidge opened a new pull request #25666: [SQL][SPARK-28962] Provide index argument to filter lambda functions URL: https://github.com/apache/spark/pull/25666 ### What changes were proposed in this pull request? Lambda functions to array `filter` can now take as input the index as well as the element. This behavior matches array `transform`. ### Why are the changes needed? See JIRA. It's generally useful, and particularly so if you're working with fixed length arrays. ### Does this PR introduce any user-facing change? Previously filter lambdas had to look like `filter(arr, el -> whatever)` Now, lambdas can take an index argument as well `filter(array, (el, idx) -> whatever)` ### How was this patch tested? I added unit tests to `HigherOrderFunctionsSuite`.
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