dwsmith1983 commented on PR #25658:
URL: https://github.com/apache/datafusion/pull/25658#issuecomment-5952501082

   @jayzhan211 thanks, nice find. You're right that the scan for `-0.0` runs 
over the whole build column each time the comparator is built, even when 
nothing needs rewriting. I'd like to keep this PR to what it has and do the 
build-time normalization in a follow-up: store the normalized keys in 
`JoinLeftData` beside `values()`, account for any copy in the build 
reservation, and add a constructor that takes pre-normalized left arrays. I'll 
use your query as the benchmark.
   


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