andygrove commented on issue #658:
URL: 
https://github.com/apache/arrow-datafusion/issues/658#issuecomment-873463441


   The issue seems to be in HashJoinExec. Here are results from two runs.
   
   ```
   HashJoinExec: mode=Partitioned, join_type=Inner, on=[(Column { name: 
"l_orderkey", index: 0 }, Column { name: "o_orderkey", index: 0 })], 
metrics=outputRows=3115255
     CoalesceBatchesExec: target_batch_size=4096, metrics=outputRows=3115341
   ```
   
   ```
   HashJoinExec: mode=Partitioned, join_type=Inner, on=[(Column { name: 
"l_orderkey", index: 0 }, Column { name: "o_orderkey", index: 0 })], 
metrics=outputRows=3115252
     CoalesceBatchesExec: target_batch_size=4096, metrics=outputRows=3115341
   ```


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