edmondop opened a new pull request, #56:
URL: https://github.com/apache/datafusion-ray/pull/56

   In the query stage, we take the output partition count of the first child if 
the plan has children, assuming all the plans have the same partition count.
   
   While this is effectively true, if a bug is introduced in planning, this 
assumption will not hold anymore, and the program might start behaving in 
surprising ways that are difficult to troubleshoot. Rather than taking the 
value from the first child, the last child, or a random child, ensuring that if 
there are children they all have the same output partition count is a more 
robust approach


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