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https://issues.apache.org/jira/browse/SPARK-23937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-23937:
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Assignee: (was: Apache Spark)
> 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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