hagerf opened a new pull request #26762: [SPARK-30131] add array_median function URL: https://github.com/apache/spark/pull/26762 ### What changes were proposed in this pull request? In this PR I have added a dataframe function `array_median` that takes in one argument i.e. the array, checks that it only contains numeric values and returns the median value as a double. ### Why are the changes needed? It is known that there isn't any exact median function in Spark SQL, and this might be a difficult problem to solve efficiently. However, to find the median for an array should be a simple task, and something that users can utilize when collecting numeric values to a list or set. ### Does this PR introduce any user-facing change? Yes, a new function will be available for users, `array_median`. ### How was this patch tested? unit tests
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