Dandandan commented on PR #15697:
URL: https://github.com/apache/datafusion/pull/15697#issuecomment-2800459456

   > I'll take a look tomorrow! Why do we have to use only the first column? Is 
it just to break up the change into smaller units? We had multi-column support 
working in the now closed PR that added it.
   
   Thanks!
   Time was up yesterday.
   I see your PR also handled it.
   
   I think it is not super hard to add support for all columns, but want to 
benchmark the change well as well. As the first column(s) filter out most of 
the rows the gains for adding more filters become smaller and with many rows it 
might be faster to only keep a smaller number of first sort columns instead of 
filtering on all.
   


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