[jira] [Created] (FLINK-6888) Can not determine TypeInformation of ACC type of AggregateFunction when ACC is a Scala case/tuple class

["Jark Wu (JIRA)" <ji...@apache.org>]

Jark Wu created FLINK-6888:
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             Summary: Can not determine TypeInformation of ACC type of AggregateFunction when ACC is a Scala case/tuple class
                 Key: FLINK-6888
                 URL: https://issues.apache.org/jira/browse/FLINK-6888
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
            Reporter: Jark Wu
            Assignee: Jark Wu
             Fix For: 1.4.0


Currently the {{ACC}} TypeInformation of {{org.apache.flink.table.functions.AggregateFunction[T, ACC]}} is extracted using {{TypeInformation.of(Class)}}. When {{ACC}} is a Scala case class or tuple class, the TypeInformation will fall back to {{GenericType}} which result in bad performance when state de/serialization. 

I suggest to extract the ACC TypeInformation when called {{TableEnvironment.registerFunction()}}.



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