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https://issues.apache.org/jira/browse/SPARK-23908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16577080#comment-16577080
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Apache Spark commented on SPARK-23908:
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User 'ueshin' has created a pull request for this issue:
https://github.com/apache/spark/pull/22075
> 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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