Fanoid opened a new pull request, #205:
URL: https://github.com/apache/flink-ml/pull/205
## What is the purpose of the change
This PR fixes null values handling in StringIndexer and StringIndexerModel.
## Brief change log
- Skip null values in training, and handle null values in transforming.
- Add tests for null values handling in corresponding test class.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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