nu-cmd-dataframe 0.93.0

Nushell's dataframe commands based on polars.
Documentation 
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use crate::dataframe::values::{Column, NuDataFrame};
use nu_engine::command_prelude::*;

use polars::prelude::{is_in, IntoSeries};

#[derive(Clone)]
pub struct IsIn;

impl Command for IsIn {
    fn name(&self) -> &str {
        "dfr is-in"
    }

    fn usage(&self) -> &str {
        "Checks if elements from a series are contained in right series."
    }

    fn signature(&self) -> Signature {
        Signature::build(self.name())
            .required("other", SyntaxShape::Any, "right series")
            .input_output_type(
                Type::Custom("dataframe".into()),
                Type::Custom("dataframe".into()),
            )
            .category(Category::Custom("dataframe".into()))
    }

    fn examples(&self) -> Vec<Example> {
        vec![Example {
            description: "Checks if elements from a series are contained in right series",
            example: r#"let other = ([1 3 6] | dfr into-df);
    [5 6 6 6 8 8 8] | dfr into-df | dfr is-in $other"#,
            result: Some(
                NuDataFrame::try_from_columns(
                    vec![Column::new(
                        "is_in".to_string(),
                        vec![
                            Value::test_bool(false),
                            Value::test_bool(true),
                            Value::test_bool(true),
                            Value::test_bool(true),
                            Value::test_bool(false),
                            Value::test_bool(false),
                            Value::test_bool(false),
                        ],
                    )],
                    None,
                )
                .expect("simple df for test should not fail")
                .into_value(Span::test_data()),
            ),
        }]
    }

    fn run(
        &self,
        engine_state: &EngineState,
        stack: &mut Stack,
        call: &Call,
        input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        command(engine_state, stack, call, input)
    }
}

fn command(
    engine_state: &EngineState,
    stack: &mut Stack,
    call: &Call,
    input: PipelineData,
) -> Result<PipelineData, ShellError> {
    let df = NuDataFrame::try_from_pipeline(input, call.head)?.as_series(call.head)?;

    let other_value: Value = call.req(engine_state, stack, 0)?;
    let other_span = other_value.span();
    let other_df = NuDataFrame::try_from_value(other_value)?;
    let other = other_df.as_series(other_span)?;

    let mut res = is_in(&df, &other)
        .map_err(|e| ShellError::GenericError {
            error: "Error finding in other".into(),
            msg: e.to_string(),
            span: Some(call.head),
            help: None,
            inner: vec![],
        })?
        .into_series();

    res.rename("is_in");

    NuDataFrame::try_from_series(vec![res.into_series()], call.head)
        .map(|df| PipelineData::Value(NuDataFrame::into_value(df, call.head), None))
}

#[cfg(test)]
mod test {
    use super::super::super::super::test_dataframe::test_dataframe;
    use super::*;

    #[test]
    fn test_examples() {
        test_dataframe(vec![Box::new(IsIn {})])
    }
}