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https://issues.apache.org/jira/browse/SPARK-28722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-28722.
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Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 25442
[https://github.com/apache/spark/pull/25442]
> Change sequential label sorting in StringIndexer fit to parallel
> ----------------------------------------------------------------
>
> Key: SPARK-28722
> URL: https://issues.apache.org/jira/browse/SPARK-28722
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 3.0.0
> Reporter: Liang-Chi Hsieh
> Assignee: Liang-Chi Hsieh
> Priority: Minor
> Fix For: 3.0.0
>
>
> The fit method in StringIndexer sorts given labels in a sequential approach,
> if there are multiple input columns. When the number of input column
> increases, the time of label sorting dramatically increases too so it is hard
> to use in practice if dealing with hundreds of input columns.
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