Bruce Robbins commented on SPARK-23936:

I would like to take this one, assuming no one has taken it. I will also watch 
for responses to [~mn-mikke] question.

> 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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