Xiao Li created SPARK-23936:

             Summary: 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

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 

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