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Subject [GitHub] [spark] zhengruifeng opened a new pull request #26052: [SPARK-29380][ML] RFormula avoid repeated 'first' jobs to get vector size
Date Tue, 08 Oct 2019 07:45:01 GMT
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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