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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