adriangb commented on PR #17632:
URL: https://github.com/apache/datafusion/pull/17632#issuecomment-3305036177

   It shouldn't be too bad: without filters you'd still have to run the hash 
function once in RepartitionExec and another hash function in HashJoinExec. So 
we're running 2 times instead of 3 _for rows that match the filter_. For rows 
that are pruned we run it 1 time instead of 2. And that's only until all of the 
build sides are done, then we may run it 0 times.


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