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use crate::dataframe::values::{Column, NuDataFrame, NuLazyFrame};
use nu_engine::command_prelude::*;
#[derive(Clone)]
pub struct LazyCollect;
impl Command for LazyCollect {
fn name(&self) -> &str {
"dfr collect"
}
fn usage(&self) -> &str {
"Collect lazy dataframe into eager dataframe."
}
fn signature(&self) -> Signature {
Signature::build(self.name())
.input_output_type(
Type::Custom("dataframe".into()),
Type::Custom("dataframe".into()),
)
.category(Category::Custom("lazyframe".into()))
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "drop duplicates",
example: "[[a b]; [1 2] [3 4]] | dfr into-lazy | dfr collect",
result: Some(
NuDataFrame::try_from_columns(
vec![
Column::new(
"a".to_string(),
vec![Value::test_int(1), Value::test_int(3)],
),
Column::new(
"b".to_string(),
vec![Value::test_int(2), Value::test_int(4)],
),
],
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> {
let lazy = NuLazyFrame::try_from_pipeline(input, call.head)?;
let eager = lazy.collect(call.head)?;
let value = Value::custom(Box::new(eager), call.head);
Ok(PipelineData::Value(value, None))
}
}
#[cfg(test)]
mod test {
use super::super::super::test_dataframe::test_dataframe;
use super::*;
#[test]
fn test_examples() {
test_dataframe(vec![Box::new(LazyCollect {})])
}
}
|
