andygrove commented on issue #4794:
URL: 
https://github.com/apache/arrow-datafusion/issues/4794#issuecomment-1369323927

   The bug is that the join keys are assumed to be in the same order as the 
left and right relations but in this case the left key is in the right schema
   
   ```
   left schema = ["customer.c_customer_sk", "customer.c_current_cdemo_sk", 
"customer.c_current_addr_sk"]
   right schema = ["web_sales.ws_bill_customer_sk"]
   l = web_sales.ws_bill_customer_sk, r = c.c_customer_sk
   ```
   


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