[jira] [Assigned] (SPARK-23909) High-order function: filter(array, function) → array

["Takuya Ueshin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-23909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Takuya Ueshin reassigned SPARK-23909:
-------------------------------------

    Assignee: Takuya Ueshin  (was: Herman van Hovell)

> High-order function: filter(array<T>, function<T, boolean>) → array<T>
> ----------------------------------------------------------------------
>
>                 Key: SPARK-23909
>                 URL: https://issues.apache.org/jira/browse/SPARK-23909
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Xiao Li
>            Assignee: Takuya Ueshin
>            Priority: Major
>
> Ref: https://prestodb.io/docs/current/functions/array.html
> Constructs an array from those elements of array for which function returns true:
> {noformat}
> SELECT filter(ARRAY [], x -> true); -- []
> SELECT filter(ARRAY [5, -6, NULL, 7], x -> x > 0); -- [5, 7]
> SELECT filter(ARRAY [5, NULL, 7, NULL], x -> x IS NOT NULL); -- [5, 7]
> {noformat}



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