Timo Walther created FLINK-7425:
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             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 
compatibility.

See discussion here: 
https://stackoverflow.com/questions/45621542/flink-sql-api-with-map-types-java/45622438#45622438



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