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https://issues.apache.org/jira/browse/SPARK-32974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17200721#comment-17200721
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Apache Spark commented on SPARK-32974:
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User 'zhengruifeng' has created a pull request for this issue:
https://github.com/apache/spark/pull/29850
> FeatureHasher transform optimization
> ------------------------------------
>
> Key: SPARK-32974
> URL: https://issues.apache.org/jira/browse/SPARK-32974
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 3.1.0
> Reporter: zhengruifeng
> Priority: Minor
>
> for a numerical column, its output index is a hash of its col_name, we can
> pre-compute it at first, instead of computing it on each row.
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