b004aacd69
# Description Refers to: [5093](https://github.com/nushell/nushell/issues/5093) # Tests - [x] `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes) - [x] `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect` to check that you're using the standard code style - [x] `cargo test --workspace` to check that all tests pass
101 lines
2.9 KiB
Rust
101 lines
2.9 KiB
Rust
use crate::dataframe::values::{Column, NuDataFrame, NuExpression};
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use nu_engine::CallExt;
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
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};
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use polars::prelude::QuantileInterpolOptions;
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#[derive(Clone)]
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pub struct ExprQuantile;
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impl Command for ExprQuantile {
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fn name(&self) -> &str {
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"quantile"
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}
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fn usage(&self) -> &str {
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"Aggregates the columns to the selected quantile"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.required(
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"quantile",
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SyntaxShape::Number,
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"quantile value for quantile operation",
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)
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.input_type(Type::Custom("expression".into()))
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.output_type(Type::Custom("expression".into()))
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.category(Category::Custom("expression".into()))
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Quantile aggregation for a group-by",
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example: r#"[[a b]; [one 2] [one 4] [two 1]]
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| into df
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| group-by a
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| agg (col b | quantile 0.5)"#,
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result: Some(
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NuDataFrame::try_from_columns(vec![
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Column::new(
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"a".to_string(),
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vec![Value::test_string("one"), Value::test_string("two")],
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),
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Column::new(
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"b".to_string(),
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vec![Value::test_float(4.0), Value::test_float(1.0)],
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),
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])
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.expect("simple df for test should not fail")
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.into_value(Span::test_data()),
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),
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}]
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["statistics", "percentile", "distribution"]
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let value = input.into_value(call.head);
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let quantile: f64 = call.req(engine_state, stack, 0)?;
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let expr = NuExpression::try_from_value(value)?;
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let expr: NuExpression = expr
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.into_polars()
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.quantile(quantile, QuantileInterpolOptions::default())
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.into();
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Ok(PipelineData::Value(
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NuExpression::into_value(expr, call.head),
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None,
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))
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}
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}
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#[cfg(test)]
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mod test {
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use super::super::super::test_dataframe::test_dataframe;
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use super::*;
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use crate::dataframe::lazy::aggregate::LazyAggregate;
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use crate::dataframe::lazy::groupby::ToLazyGroupBy;
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#[test]
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fn test_examples() {
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test_dataframe(vec![
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Box::new(ExprQuantile {}),
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Box::new(LazyAggregate {}),
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Box::new(ToLazyGroupBy {}),
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])
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}
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}
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