Dandandan commented on pull request #972:
URL: https://github.com/apache/arrow-datafusion/pull/972#issuecomment-917917074


   > @Dandandan if I read the code correctly, it's only using cpu cores in 
tests. For actual execution, the partition count is read from the context 
config in physical planner when creating the table scan node:
   > 
   > ```
   > let max_partitions = ctx_state.config.target_partitions;
   > ```
   
   Thanks, you're right. I skimmed the PR too quickly.
   
   Two suggestions I have for the PR:
   
   * call it `target_partitions` instead of `max_partitions`
   * use the `target_partitions`  for MemTable as well (instead of using nr of 
cpu cores) 


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