Kapil Singh created SPARK-16892:
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Summary: 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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