Xiao Li created SPARK-23938:

             Summary: High-order function: map_zip_with(map<K, V1>, map<K, V2>, 
function<K, V1, V2, V3>) → map<K, V3>
                 Key: SPARK-23938
                 URL: https://issues.apache.org/jira/browse/SPARK-23938
             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

Merges the two given maps into a single map by applying function to the pair of 
values with the same key. For keys only presented in one map, NULL will be 
passed as the value for the missing key.

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