[jira] [Created] (FLINK-13668) Add abstract classes for three typical scenarios of (Flat)Mapper.

["Xu Yang (JIRA)" <ji...@apache.org>]

Xu Yang created FLINK-13668:
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             Summary: Add abstract classes for three typical scenarios of (Flat)Mapper.
                 Key: FLINK-13668
                 URL: https://issues.apache.org/jira/browse/FLINK-13668
             Project: Flink
          Issue Type: Sub-task
          Components: Library / Machine Learning
            Reporter: Xu Yang


_FlatMapper transforms one Row type data into zero_, _one_, _or more Row type result data_, _and Mapper transforms one Row type data into one Row type result data. For most of practical_ *scenarios*, *the outputs are single column. Using these extend classes*, *we can be more focus on the algorithm development.*
 * *Add SISOFlatMapper for the Single Input column and Single Output column scenario.*
 * *Add SISOMapper for the Single Input column and Single Output column scenario.*
 * *Add MISOMapper for the Multi Input column and Single Output column scenario.*



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