alamb commented on issue #1214:
URL: 
https://github.com/apache/arrow-datafusion/issues/1214#issuecomment-962586819


   @Jimexist  I don't have a clear thought on the mater. There are tradeoffs:
   1. Doing it client side (e.g. `\copy` ) has the benefit of easy to use
   2. Doing it "server" side (e.g. `COPY` or `SELECT .. INTO ` can likely be 
made much faster but has security implications as well
   
   The more I think about it, maybe we should leave such features out of 
datafusion (server side). The rationale is that the feature already exists in 
tools that use DataFusion such as 
https://github.com/roapi/roapi/tree/main/columnq-cli#format-conversion as 
@houqp  pointed out.
   
   So maybe adding it to `datafusion-cli` as a client side feature would be 
good enough?
   


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