matthewmturner commented on issue #147:
URL: 
https://github.com/apache/arrow-datafusion/issues/147#issuecomment-1001090956


   @Dandandan my understanding of what i did was set the expected partitions at 
the `ExecutionContext` / `ExecutionConfig` level and then collect that into 
record batches from a `DataFrame` with `df.collect_partitioned` which would 
take into account the target partitions.  That being said i had to play around 
with that a lot to get a `MemTable` so im not confident its doing what i 
expected.  I'll look into it a little more though.
   
   If what i did was incorrect is there a more idiomatic way to create a 
`MemTable` with the desired number of partitions?
   
   Separately, i havent been able to find docs on the supported math functions. 
 Any info you could provide on that?


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