Rich-T-kid commented on issue #26815:
URL: https://github.com/apache/datafusion/issues/26815#issuecomment-6480541227

   Closing as not planned. The final implementation was benchmarked with 
RLE-to-dictionary enabled on both sides: TPC-H was flat, TPC-DS was 1.32% 
slower, and ClickBench does not exercise `HashJoinExec`. The measured benefit 
does not justify adding this cache to the join path.
   


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