alamb commented on pull request #1990:
URL: 
https://github.com/apache/arrow-datafusion/pull/1990#issuecomment-1073220368


   @liukun4515  there are already some configuration settings related to 
parallelism 
   
   `target_partitions` (like degree of parallelism)
   
https://github.com/apache/arrow-datafusion/blob/4994eda81c2280fa78aea1ae0d92ce918947eebd/datafusion/src/execution/context.rs#L822-L823
   
   `batch_size` (that controls how many batches are processed)
   
https://github.com/apache/arrow-datafusion/blob/4994eda81c2280fa78aea1ae0d92ce918947eebd/datafusion/src/execution/context.rs#L909-L914
   
   I am not sure how well these two parameters are respected in all DataFusion 
operators, but I think the configurations settings are reasonable


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