zhengruifeng created SPARK-29380:
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Summary: 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
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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