matthewmturner commented on issue #1777:
URL: 
https://github.com/apache/arrow-datafusion/issues/1777#issuecomment-1034315867


   > The direct implementation of `COPY FROM` (copy data from a file to a 
table) is if a table exists, then we can create a new table from the file and 
`union` new table with the old table, otherwise, we can let the new table 
`union`s with an empty table with the same scheme.
   > 
   > BTW, we should make `sqlparser-rs` support those commands firstly.
   
   @xudong963 To confirm - does `COPY FROM` functionality already exist?  I'm 
not sure if i understood correctly, but I was focused on writing 
tables/dataframes from datafusion to files for this issue.
   
   And definitely agree on checking `sqlparser-rs`. I will check that out.


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