Timo Walther created FLINK-7425:

             Summary: Support Map<K,V> in TypeExtractor
                 Key: FLINK-7425
                 URL: https://issues.apache.org/jira/browse/FLINK-7425
             Project: Flink
          Issue Type: Improvement
          Components: Type Serialization System
            Reporter: Timo Walther

If you print {{new TypeHint<Map<String, String>>(){}.getType()}} you will see 
that even this is GenericTypeInfo. This is confusing, but maps where not 
supported initially. It would be good to officially support all major Java 
collections. I don't know if we can change this behavior because of backwards 

See discussion here: 

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