zhengruifeng opened a new pull request #26052: [SPARK-29380][ML] RFormula avoid repeated 'first' jobs to get vector size URL: https://github.com/apache/spark/pull/26052 ### What changes were proposed in this pull request? get the first row lazily, and reuse it for each vector column. ### Why are the changes needed? avoid unnecssary `first` jobs ### Does this PR introduce any user-facing change? no ### How was this patch tested? existing testsuites & local tests in repl
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