v0y4g3r commented on PR #2855:
URL: 
https://github.com/apache/arrow-datafusion/pull/2855#issuecomment-1179468808

   > @v0y4g3r I'd like to start understanding more about the efforts here. Is 
the plan to put this behind a cargo `feature` so that we can switch between 
`arrow` and `arrow2`?
   
   No, it's simply about upgrading dependencies. 
   
   But I'm also interested in something like defining a trait to hide the API 
differences between arrow and arrow2 and use cargo feature to provide an 
option. But I have no ideas on how to implement that now.
   
   > There are some license headers missing:
   > 
   > ```
   > NOT APPROVED: ballista/rust/core/src/memory_stream.rs 
(./ballista/rust/core/src/memory_stream.rs): false
   > NOT APPROVED: datafusion/src/physical_plan/sort.rs 
(./datafusion/src/physical_plan/sort.rs): false
   > NOT APPROVED: datafusion/tests/sql_integration.rs 
(./datafusion/tests/sql_integration.rs): false
   > NOT APPROVED: datafusion-physical-expr/src/test_util.rs 
(./datafusion-physical-expr/src/test_util.rs): false
   > ```
   
   Seems like current arrow2 branch doesn't have license header. But it's ok I 
added headers.
   


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