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https://issues.apache.org/jira/browse/SPARK-16892?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-16892.
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Resolution: Not A Problem
> flatten function to get flat array (or map) column from array of array (or
> array of map) column
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-16892
> URL: https://issues.apache.org/jira/browse/SPARK-16892
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Kapil Singh
>
> flatten(input)
> Converts input of array of array type into flat array type by inserting
> elements of all element arrays into single array. Example:
> input: [[1, 2, 3], [4, 5], [-1, -2, 0]]
> output: [1, 2, 3, 4, 5, -1, -2, 0]
> Converts input of array of map type into flat map type by inserting key-value
> pairs of all element maps into single map. Example:
> input: [(1 -> "one", 2 -> "two"), (0 -> "zero"), (4 -> "four")]
> output: (1 -> "one", 2 -> "two", 0 -> "zero", 4 -> "four")
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