[jira] [Resolved] (SPARK-23938) High-order function: map_zip_with(map, map, function) → map

["Takuya Ueshin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-23938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Takuya Ueshin resolved SPARK-23938.
-----------------------------------
       Resolution: Fixed
         Assignee: Marek Novotny
    Fix Version/s: 2.4.0

Issue resolved by pull request 22017
https://github.com/apache/spark/pull/22017

> High-order function: map_zip_with(map<K, V1>, map<K, V2>, function<K, V1, V2, V3>) → map<K, V3>
> -----------------------------------------------------------------------------------------------
>
>                 Key: SPARK-23938
>                 URL: https://issues.apache.org/jira/browse/SPARK-23938
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Xiao Li
>            Assignee: Marek Novotny
>            Priority: Major
>             Fix For: 2.4.0
>
>
> Ref:  https://prestodb.io/docs/current/functions/map.html
> Merges the two given maps into a single map by applying function to the pair of values with the same key. For keys only presented in one map, NULL will be passed as the value for the missing key.
> {noformat}
> SELECT map_zip_with(MAP(ARRAY[1, 2, 3], ARRAY['a', 'b', 'c']), -- {1 -> ad, 2 -> be, 3 -> cf}
>                     MAP(ARRAY[1, 2, 3], ARRAY['d', 'e', 'f']),
>                     (k, v1, v2) -> concat(v1, v2));
> SELECT map_zip_with(MAP(ARRAY['k1', 'k2'], ARRAY[1, 2]), -- {k1 -> ROW(1, null), k2 -> ROW(2, 4), k3 -> ROW(null, 9)}
>                     MAP(ARRAY['k2', 'k3'], ARRAY[4, 9]),
>                     (k, v1, v2) -> (v1, v2));
> SELECT map_zip_with(MAP(ARRAY['a', 'b', 'c'], ARRAY[1, 8, 27]), -- {a -> a1, b -> b4, c -> c9}
>                     MAP(ARRAY['a', 'b', 'c'], ARRAY[1, 2, 3]),
>                     (k, v1, v2) -> k || CAST(v1/v2 AS VARCHAR));
> {noformat}



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