[jira] [Created] (FLINK-13513) Add the FlatMapper and related classes for later algorithm implementations.

[Shang Yuanchun (Jira)]

Xu Yang created FLINK-13513:
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             Summary: Add  the FlatMapper and related classes  for later algorithm implementations.
                 Key: FLINK-13513
                 URL: https://issues.apache.org/jira/browse/FLINK-13513
             Project: Flink
          Issue Type: Sub-task
          Components: Library / Machine Learning
            Reporter: Xu Yang


Define the abstract classes for the single-thread executor for Row type data.

* Add the definition of abstract class FlatMapper
* Add interface MapOpInterface for  _the map operation of Row type data._
* Add abstract class FlatModelMapper, Mapper extends FlatMapper
* Add abstract class ModelMapper extends FlatModelMapper



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