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https://issues.apache.org/jira/browse/SPARK-23936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434185#comment-16434185
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Marek Novotny commented on SPARK-23936:
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Shouldn't we overload _concat_ function for maps instead of introducing
_map_concat_?
> High-order function: map_concat(map1<K, V>, map2<K, V>, ..., mapN<K, V>) →
> map<K,V>
> -----------------------------------------------------------------------------------
>
> Key: SPARK-23936
> URL: https://issues.apache.org/jira/browse/SPARK-23936
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Priority: Major
>
> Ref: https://prestodb.io/docs/current/functions/map.html
> Returns the union of all the given maps. If a key is found in multiple given
> maps, that key’s value in the resulting map comes from the last one of those
> maps.
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