f1ee9113ac
* nuframe in its own type in UntaggedValue * Removed eager dataframe from enum * Dataframe created from list of values * Corrected order in dataframe columns * Returned tag from stream collection * Removed series from dataframe commands * Arithmetic operators * forced push * forced push * Replace all command * String commands * appending operations with dfs * Testing suite for dataframes * Unit test for dataframe commands * improved equality for dataframes
79 lines
2.1 KiB
Rust
79 lines
2.1 KiB
Rust
use crate::{commands::dataframe::utils::parse_polars_error, prelude::*};
|
|
use nu_engine::WholeStreamCommand;
|
|
use nu_errors::ShellError;
|
|
use nu_protocol::{
|
|
dataframe::{Column, NuDataFrame},
|
|
Signature, UntaggedValue,
|
|
};
|
|
use polars::prelude::IntoSeries;
|
|
|
|
pub struct DataFrame;
|
|
|
|
impl WholeStreamCommand for DataFrame {
|
|
fn name(&self) -> &str {
|
|
"dataframe arg-true"
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"[Series] Returns indexes where values are true"
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build("dataframe arg-true")
|
|
}
|
|
|
|
fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
|
|
command(args)
|
|
}
|
|
|
|
fn examples(&self) -> Vec<Example> {
|
|
vec![Example {
|
|
description: "Returns indexes where values are true",
|
|
example: "[$false $true $false] | dataframe to-df | dataframe arg-true",
|
|
result: Some(vec![NuDataFrame::try_from_columns(
|
|
vec![Column::new(
|
|
"arg_true".to_string(),
|
|
vec![UntaggedValue::int(1).into()],
|
|
)],
|
|
&Span::default(),
|
|
)
|
|
.expect("simple df for test should not fail")
|
|
.into_value(Tag::default())]),
|
|
}]
|
|
}
|
|
}
|
|
|
|
fn command(mut args: CommandArgs) -> Result<OutputStream, ShellError> {
|
|
let tag = args.call_info.name_tag.clone();
|
|
|
|
let (df, df_tag) = NuDataFrame::try_from_stream(&mut args.input, &tag.span)?;
|
|
|
|
let series = df.as_series(&df_tag.span)?;
|
|
let bool = series.bool().map_err(|e| {
|
|
parse_polars_error::<&str>(
|
|
&e,
|
|
&tag.span,
|
|
Some("arg-true only works with series of type bool"),
|
|
)
|
|
})?;
|
|
|
|
let mut res = bool.arg_true().into_series();
|
|
res.rename("arg_true");
|
|
|
|
let df = NuDataFrame::try_from_series(vec![res], &tag.span)?;
|
|
Ok(OutputStream::one(df.into_value(df_tag)))
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::DataFrame;
|
|
use super::ShellError;
|
|
|
|
#[test]
|
|
fn examples_work_as_expected() -> Result<(), ShellError> {
|
|
use crate::examples::test_dataframe as test_examples;
|
|
|
|
test_examples(DataFrame {})
|
|
}
|
|
}
|