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From "Timo Walther (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-7691) Remove ClassTag in Scala DataSet API
Date Tue, 26 Sep 2017 12:51:00 GMT
Timo Walther created FLINK-7691:
-----------------------------------

             Summary: Remove ClassTag in Scala DataSet API
                 Key: FLINK-7691
                 URL: https://issues.apache.org/jira/browse/FLINK-7691
             Project: Flink
          Issue Type: Improvement
          Components: DataSet API
            Reporter: Timo Walther


In the DataStream API a {{ClassTag}} is not required, which allows to pass {{TypeInformation}}
manually if required. In the DataSet API most methods look like:

{code}
// DataSet API
def fromElements[T: ClassTag : TypeInformation](data: T*): DataSet[T]
// DataStream API
def fromElements[T: TypeInformation](data: T*): DataStream[T]
{code}

I would propose to remove the ClassTag, if possible. This would make it easier e.g. to supply
TypeInformation for the {{Row}} type. Or is there an easier way in Scala that I don't know?



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