forked from extern/nushell
78 lines
2.1 KiB
Rust
78 lines
2.1 KiB
Rust
use crate::dataframe::values::{Column, NuDataFrame};
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use super::super::values::NuLazyFrame;
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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, Type, Value,
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};
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#[derive(Clone)]
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pub struct LazyCollect;
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impl Command for LazyCollect {
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fn name(&self) -> &str {
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"collect"
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}
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fn usage(&self) -> &str {
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"Collect lazy dataframe into eager dataframe"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.input_type(Type::Custom("dataframe".into()))
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.output_type(Type::Custom("dataframe".into()))
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.category(Category::Custom("lazyframe".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: "drop duplicates",
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example: "[[a b]; [1 2] [3 4]] | into lazy | collect",
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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_int(1), Value::test_int(3)],
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),
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Column::new(
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"b".to_string(),
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vec![Value::test_int(2), Value::test_int(4)],
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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 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 lazy = NuLazyFrame::try_from_pipeline(input, call.head)?;
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let eager = lazy.collect(call.head)?;
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let value = Value::CustomValue {
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val: Box::new(eager),
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span: call.head,
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};
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Ok(PipelineData::Value(value, None))
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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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#[test]
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fn test_examples() {
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test_dataframe(vec![Box::new(LazyCollect {})])
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}
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}
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