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# Description
This pull request does a lot of the heavy lifting needed to supported
more complex dtypes like categorical dtypes. It introduces a new
CustomValue, NuDataType and makes NuSchema a full CustomValue. Further
more it introduces a new command `polars into-dtype` that allows a dtype
to be created. This can then be passed into schemas when they are
created.
```nu
> ❯ : let dt = ("str" | polars to-dtype)
> ❯ : [[a b]; ["one" "two"]] | polars into-df -s {a: $dt, b: str} | polars schema
╭───┬─────╮
│ a │ str │
│ b │ str │
╰───┴─────╯
```
# User-Facing Changes
- Introduces new command `polars into-dtype`, allows dtype variables to
be passed in during schema creation.
Dataframe
This dataframe directory holds all of the definitions of the dataframe data structures and commands.
There are three sections of commands:
For more details see the Nushell book section on dataframes