zhengruifeng opened a new pull request #27037: [SPARK-30376][ML] Unify the 
computation of numFeatures
URL: https://github.com/apache/spark/pull/27037
 
 
   ### What changes were proposed in this pull request?
   using `MetadataUtils.getNumFeatures` to extract the numFeatures
   
   ### Why are the changes needed?
   may avoid `first`/`head` job if metadata has attrGroup
   
   
   ### Does this PR introduce any user-facing change?
   No
   
   
   ### How was this patch tested?
   existing testsuites
   

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