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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-23937) High-order function: map_filter(map<K, V>, function<K, V, boolean>) → MAP<K,V>
Date Fri, 03 Aug 2018 15:23:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-23937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568337#comment-16568337
] 

Apache Spark commented on SPARK-23937:
--------------------------------------

User 'mgaido91' has created a pull request for this issue:
https://github.com/apache/spark/pull/21986

> High-order function: map_filter(map<K, V>, function<K, V, boolean>) → MAP<K,V>
> ------------------------------------------------------------------------------
>
>                 Key: SPARK-23937
>                 URL: https://issues.apache.org/jira/browse/SPARK-23937
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Xiao Li
>            Priority: Major
>
> Constructs a map from those entries of map for which function returns true:
> {noformat}
> SELECT map_filter(MAP(ARRAY[], ARRAY[]), (k, v) -> true); -- {}
> SELECT map_filter(MAP(ARRAY[10, 20, 30], ARRAY['a', NULL, 'c']), (k, v) -> v IS NOT
NULL); -- {10 -> a, 30 -> c}
> SELECT map_filter(MAP(ARRAY['k1', 'k2', 'k3'], ARRAY[20, 3, 15]), (k, v) -> v >
10); -- {k1 -> 20, k3 -> 15}
> {noformat}



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