Fan Hong created FLINK-30730:
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Summary: StringIndexer cannot handle null values correctly when
training
Key: FLINK-30730
URL: https://issues.apache.org/jira/browse/FLINK-30730
Project: Flink
Issue Type: Bug
Components: Library / Machine Learning
Affects Versions: ml-2.1.0
Reporter: Fan Hong
When training data contains null values, StringIndexer throws a exception. The
reason is this method [1]: null values are neither String type or Number type.
[1]
https://github.com/apache/flink-ml/blob/966cedd7bbab4e12d8d8b37dbd582146714e68a6/flink-ml-lib/src/main/java/org/apache/flink/ml/feature/stringindexer/StringIndexer.java#L164
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