alamb opened a new pull request, #6236:
URL: https://github.com/apache/arrow-datafusion/pull/6236

   Draft until https://github.com/apache/arrow-datafusion/pull/6154 is merged
   
   # Which issue does this PR close?
   Follow on to 
   
   https://github.com/apache/arrow-datafusion/pull/6154
   
   # Rationale for this change
   We had substantial back and forth on 
https://github.com/apache/arrow-datafusion/pull/6154 related to locking or a 
single batch on each insert or for the entire operation. This required two 
similar, but not quite the same codepaths
   
   Upon reflection, since everything is being buffered anyways, we can avoid a 
second mostly copy of the loop and instead just insert the batches once at the 
end of the stream.
   
   # What changes are included in this PR?
   
   1. Pull state into a `struct` with names
   2. Buffer batches in a separate `Vec` and then insert them all at once when 
the input stream is done
   3. Remove the second mostly copy
   
   # Are these changes tested?
   covered by existing tests 
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   # Are there any user-facing changes?
   
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