goldmedal commented on PR #15423:
URL: https://github.com/apache/datafusion/pull/15423#issuecomment-2764422078

   > I think to support this selection vector, the executors need to be updated 
to interpret an additional metadata column. However, since executors are part 
of the public interface that some downstream projects might depend on directly, 
it's better to ensure backward compatibility.
   
   I agree with @2010YOUY01. It would be a breaking change for 
`RepartitionExec`.
   After this PR, we still have the following-up works for #15382 and #15383. 
Maybe we can use the selection vector by default, but I also prefer to keep the 
original strategy for backward compatibility for a while.
   


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