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https://issues.apache.org/jira/browse/SPARK-28968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhengruifeng resolved SPARK-28968.
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Resolution: Resolved
> Add HasNumFeatures in the scala side
> ------------------------------------
>
> Key: SPARK-28968
> URL: https://issues.apache.org/jira/browse/SPARK-28968
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 3.0.0
> Reporter: zhengruifeng
> Priority: Minor
>
> In the py side, HasNumFeatures is provided and inherited by 'HashingTF' and
> 'FeatureHasher'.
> It is reasonable to also add HasNumFeatures in the scala side.
> Since '1<<18' is used by default in all place, we should add it as a default
> into param trait.
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