Zhenghua Gao created FLINK-6124:

             Summary: support max/min aggregations for string type
                 Key: FLINK-6124
                 URL: https://issues.apache.org/jira/browse/FLINK-6124
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: Zhenghua Gao
            Assignee: Zhenghua Gao

Recently when I port some query to Flink SQL, I found currently min/max 
aggregations on string type is not supported and should be added.
When min/max aggregations are used on string column, return min/max value by 
lexicographically order.


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