[jira] [Commented] (SPARK-16892) flatten function to get flat array (or map) column from array of array (or array of map) column

["Jayadevan M (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-16892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15646443#comment-15646443 ] 

Jayadevan M commented on SPARK-16892:
-------------------------------------

I hope you can use flatMap for this scenario. For example

var array=Array(Array(1, 2, 3), Array(4, 5), Array(-1, -2, 0));
var rdd = sc.parallelize(array);
rdd.flatMap(x=>x).collect();


> 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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