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https://issues.apache.org/jira/browse/SPARK-23940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16664615#comment-16664615
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Dongjoon Hyun commented on SPARK-23940:
---------------------------------------
I updated the version since this is reverted from `branch-2.4` during RC4.
> High-order function: transform_values(map<K, V1>, function<K, V1, V2>) →
> map<K, V2>
> -----------------------------------------------------------------------------------
>
> Key: SPARK-23940
> URL: https://issues.apache.org/jira/browse/SPARK-23940
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Assignee: Neha Patil
> Priority: Major
> Labels: starter
> Fix For: 3.0.0
>
>
> Ref: https://prestodb.io/docs/current/functions/map.html
> Returns a map that applies function to each entry of map and transforms the
> values.
> {noformat}
> SELECT transform_values(MAP(ARRAY[], ARRAY[]), (k, v) -> v + 1); -- {}
> SELECT transform_values(MAP(ARRAY [1, 2, 3], ARRAY [10, 20, 30]), (k, v) -> v
> + k); -- {1 -> 11, 2 -> 22, 3 -> 33}
> SELECT transform_values(MAP(ARRAY [1, 2, 3], ARRAY ['a', 'b', 'c']), (k, v)
> -> k * k); -- {1 -> 1, 2 -> 4, 3 -> 9}
> SELECT transform_values(MAP(ARRAY ['a', 'b'], ARRAY [1, 2]), (k, v) -> k ||
> CAST(v as VARCHAR)); -- {a -> a1, b -> b2}
> SELECT transform_values(MAP(ARRAY [1, 2], ARRAY [1.0, 1.4]), -- {1 ->
> one_1.0, 2 -> two_1.4}
> (k, v) -> MAP(ARRAY[1, 2], ARRAY['one', 'two'])[k] ||
> '_' || CAST(v AS VARCHAR));
> {noformat}
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