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https://issues.apache.org/jira/browse/SPARK-23908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16548421#comment-16548421
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Frederick Reiss commented on SPARK-23908:
-----------------------------------------
This Jira is marked as "in progress" with the target set to a previous release
of Spark. Are you working on this, [~hvanhovell]?
> 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: Herman van Hovell
> Priority: Major
>
> 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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