Polars and SQLParser upgrade. I have exposed features that have been added to polars as command args where appropriate. --------- Co-authored-by: Jack Wright <jack.wright@disqo.com> Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com> Co-authored-by: sholderbach <sholderbach@users.noreply.github.com>
129 lines
4.2 KiB
Rust
129 lines
4.2 KiB
Rust
use crate::dataframe::values::{Column, NuDataFrame, NuExpression, NuWhen};
|
|
use nu_engine::CallExt;
|
|
use nu_protocol::{
|
|
ast::Call,
|
|
engine::{Command, EngineState, Stack},
|
|
Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
|
|
};
|
|
|
|
#[derive(Clone)]
|
|
pub struct ExprOtherwise;
|
|
|
|
impl Command for ExprOtherwise {
|
|
fn name(&self) -> &str {
|
|
"dfr otherwise"
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"completes a when expression."
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build(self.name())
|
|
.required(
|
|
"otherwise expression",
|
|
SyntaxShape::Any,
|
|
"expression to apply when no when predicate matches",
|
|
)
|
|
.input_output_type(Type::Any, Type::Custom("expression".into()))
|
|
.category(Category::Custom("expression".into()))
|
|
}
|
|
|
|
fn examples(&self) -> Vec<Example> {
|
|
vec![
|
|
Example {
|
|
description: "Create a when conditions",
|
|
example: "dfr when ((dfr col a) > 2) 4 | dfr otherwise 5",
|
|
result: None,
|
|
},
|
|
Example {
|
|
description: "Create a when conditions",
|
|
example:
|
|
"dfr when ((dfr col a) > 2) 4 | dfr when ((dfr col a) < 0) 6 | dfr otherwise 0",
|
|
result: None,
|
|
},
|
|
Example {
|
|
description: "Create a new column for the dataframe",
|
|
example: r#"[[a b]; [6 2] [1 4] [4 1]]
|
|
| dfr into-lazy
|
|
| dfr with-column (
|
|
dfr when ((dfr col a) > 2) 4 | dfr otherwise 5 | dfr as c
|
|
)
|
|
| dfr with-column (
|
|
dfr when ((dfr col a) > 5) 10 | dfr when ((dfr col a) < 2) 6 | dfr otherwise 0 | dfr as d
|
|
)
|
|
| dfr collect"#,
|
|
result: Some(
|
|
NuDataFrame::try_from_columns(vec![
|
|
Column::new(
|
|
"a".to_string(),
|
|
vec![Value::test_int(6), Value::test_int(1), Value::test_int(4)],
|
|
),
|
|
Column::new(
|
|
"b".to_string(),
|
|
vec![Value::test_int(2), Value::test_int(4), Value::test_int(1)],
|
|
),
|
|
Column::new(
|
|
"c".to_string(),
|
|
vec![Value::test_int(4), Value::test_int(5), Value::test_int(4)],
|
|
),
|
|
Column::new(
|
|
"d".to_string(),
|
|
vec![Value::test_int(10), Value::test_int(6), Value::test_int(0)],
|
|
),
|
|
])
|
|
.expect("simple df for test should not fail")
|
|
.into_value(Span::test_data()),
|
|
),
|
|
},
|
|
]
|
|
}
|
|
|
|
fn search_terms(&self) -> Vec<&str> {
|
|
vec!["condition", "else"]
|
|
}
|
|
|
|
fn run(
|
|
&self,
|
|
engine_state: &EngineState,
|
|
stack: &mut Stack,
|
|
call: &Call,
|
|
input: PipelineData,
|
|
) -> Result<PipelineData, ShellError> {
|
|
let otherwise_predicate: Value = call.req(engine_state, stack, 0)?;
|
|
let otherwise_predicate = NuExpression::try_from_value(otherwise_predicate)?;
|
|
|
|
let value = input.into_value(call.head);
|
|
let complete: NuExpression = match NuWhen::try_from_value(value)? {
|
|
NuWhen::Then(then) => then.otherwise(otherwise_predicate.into_polars()).into(),
|
|
NuWhen::ChainedThen(chained_when) => chained_when
|
|
.otherwise(otherwise_predicate.into_polars())
|
|
.into(),
|
|
};
|
|
|
|
Ok(PipelineData::Value(complete.into_value(call.head), None))
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use super::super::super::test_dataframe::test_dataframe;
|
|
use crate::dataframe::eager::{ToNu, WithColumn};
|
|
use crate::dataframe::expressions::when::ExprWhen;
|
|
use crate::dataframe::expressions::{ExprAlias, ExprCol};
|
|
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_examples() {
|
|
test_dataframe(vec![
|
|
Box::new(WithColumn {}),
|
|
Box::new(ExprCol {}),
|
|
Box::new(ExprAlias {}),
|
|
Box::new(ExprWhen {}),
|
|
Box::new(ExprOtherwise {}),
|
|
Box::new(ToNu {}),
|
|
])
|
|
}
|
|
}
|