dfr to-avro for dataframe> dfr to-avro {flags} (file)
--compression, -c {string}: use compression, supports deflate or snappyfile: file path to save dataframe| input | output | 
|---|---|
| any | any | 
Saves dataframe to avro file
> [[ab]; [12] [34]] |dfr into-df|dfr to-avrotest.avro
Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag
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    https://www.nushell.sh/commands/docs/dfr_to-avro.html