[jira] [Commented] (SPARK-23940) High-order function: transform_values(map, function) → map

["Neha Patil (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-23940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16571095#comment-16571095 ] 

Neha Patil commented on SPARK-23940:
------------------------------------

Will Publish PR by tomorrow.

> 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
>            Priority: Major
>              Labels: starter
>
> 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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