* Sample command
* Join command with checks
* More dataframes commands
* Groupby and aggregate commands
* Missing feature dataframe flag
* Renamed file
* New commands for dataframes
* error parser and df reference
* filter command for dataframes
* removed name from nu_dataframe
* commands to save to parquet and csv
* polars new version
* new dataframe commands
* series type and print
* Series basic arithmetics
* Add new column to dataframe
* Command names changed to nushell standard
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