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https://issues.apache.org/jira/browse/FLINK-30730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhipeng Zhang resolved FLINK-30730.
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Fix Version/s: ml-2.2.0
Resolution: Fixed
Fixed on master via 2b83d247cb5e81fb04b31399d436dbb9e809a473
> StringIndexer cannot handle null values correctly
> -------------------------------------------------
>
> 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
> Assignee: Fan Hong
> Priority: Major
> Labels: pull-request-available
> Fix For: ml-2.2.0
>
>
> When training data contains null values, StringIndexer throws a exception.
> The reason is this method [1]: null values are neither String type nor Number
> type.
> In StringIndexerModel, null values are also not handled correctly when
> performing transformation.
>
> [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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