Xiao Li created SPARK-23939:

             Summary: High-order function: transform_keys(map<K1, V>, 
function<K1, V, K2>) → map<K2,V>
                 Key: SPARK-23939
                 URL: https://issues.apache.org/jira/browse/SPARK-23939
             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 a map that applies function to each entry of map and transforms the 

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