[jira] [Assigned] (SPARK-23908) High-order function: transform(array, function) → array

["Herman van Hovell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-23908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Herman van Hovell reassigned SPARK-23908:
-----------------------------------------

    Assignee: Takuya Ueshin  (was: Herman van Hovell)

> High-order function: transform(array<T>, function<T, U>) → array<U>
> -------------------------------------------------------------------
>
>                 Key: SPARK-23908
>                 URL: https://issues.apache.org/jira/browse/SPARK-23908
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Xiao Li
>            Assignee: Takuya Ueshin
>            Priority: Major
>             Fix For: 2.4.0
>
>
> Ref: https://prestodb.io/docs/current/functions/array.html
> Returns an array that is the result of applying function to each element of array:
> {noformat}
> SELECT transform(ARRAY [], x -> x + 1); -- []
> SELECT transform(ARRAY [5, 6], x -> x + 1); -- [6, 7]
> SELECT transform(ARRAY [5, NULL, 6], x -> COALESCE(x, 0) + 1); -- [6, 1, 7]
> SELECT transform(ARRAY ['x', 'abc', 'z'], x -> x || '0'); -- ['x0', 'abc0', 'z0']
> SELECT transform(ARRAY [ARRAY [1, NULL, 2], ARRAY[3, NULL]], a -> filter(a, x -> x IS NOT NULL)); -- [[1, 2], [3]]
> {noformat}



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