zhengruifeng opened a new pull request #29850:
URL: https://github.com/apache/spark/pull/29850


   ### What changes were proposed in this pull request?
   pre-compute the output indices of numerical columns, instead of computing 
them on each row.
   
   
   ### Why are the changes needed?
   for a numerical column, its output index is a hash of its `col_name`, we can 
pre-compute it at first, instead of computing it on each row.
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   existing testsuites
   


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