Kaileshwar16 commented on issue #851:
URL: https://github.com/apache/wayang/issues/851#issuecomment-6383165648

   Also, I noticed `JavaJoinOperator` does the same `new 
HashMap<>(expectedNumElements)` for its `probeTable`—happy to check if the same 
approach makes sense there too. 
   
   On a side note, since you mentioned unique key estimates aren't in the 
optimizer *yet* (I saw a few `TODO`s around key distinctness in 
`ReduceByOperator` and `CoGroupOperator`), is that something on the roadmap?


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