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https://issues.apache.org/jira/browse/SPARK-29380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhengruifeng resolved SPARK-29380.
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Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 26052
[https://github.com/apache/spark/pull/26052]
> RFormula avoid repeated 'first' jobs to get vector size
> -------------------------------------------------------
>
> Key: SPARK-29380
> URL: https://issues.apache.org/jira/browse/SPARK-29380
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 3.0.0
> Reporter: zhengruifeng
> Assignee: zhengruifeng
> Priority: Minor
> Fix For: 3.0.0
>
>
> In current impl, {{RFormula}} will trigger one {{first}} job to get the
> vector size, if the size can not be obtained from {{AttributeGroup.}}
> {{This can be optimized by get the first row lazily, and reuse it for each
> vector column.}}
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