[jira] [Created] (FLINK-13918) Add class for TokenizerMapper.

[Shang Yuanchun (Jira)]

Xu Yang created FLINK-13918:
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             Summary: Add class for TokenizerMapper.
                 Key: FLINK-13918
                 URL: https://issues.apache.org/jira/browse/FLINK-13918
             Project: Flink
          Issue Type: Sub-task
          Components: Library / Machine Learning
            Reporter: Xu Yang


TokenizerMapper is a transformer to transform all words into lower case, and split it by white space.
 * Add TokenizerMapper for the operation of the TokenizerMapper.
 * Add TokenizerMapperParams for the params of TokenizerMapper.
 * Add TokenizerMapperTest for the test example.



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