aa1cd7eba6
* Sample command * Join command with checks * More dataframes commands * Groupby and aggregate commands * Missing feature dataframe flag * Renamed file * New commands for dataframes * error parser and df reference * filter command for dataframes * removed name from nu_dataframe * commands to save to parquet and csv * polars new version * new dataframe commands * series type and print * Series basic arithmetics * Add new column to dataframe * Command names changed to nushell standard
68 lines
1.8 KiB
Rust
68 lines
1.8 KiB
Rust
use crate::prelude::*;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{
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dataframe::{NuDataFrame, PolarsData},
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Signature, SyntaxShape, UntaggedValue, Value,
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};
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use super::utils::parse_polars_error;
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pub struct DataFrame;
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impl WholeStreamCommand for DataFrame {
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fn name(&self) -> &str {
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"pls with-column"
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}
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fn usage(&self) -> &str {
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"Adds a series to the dataframe"
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}
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fn signature(&self) -> Signature {
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Signature::build("pls with-column").required(
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"series",
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SyntaxShape::Any,
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"series to be added",
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)
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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command(args)
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Adds a series to the dataframe",
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example: "[[a b]; [1 2] [3 4]] | pls to-df | pls with-column ([5 6] | pls to-series)",
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result: None,
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}]
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}
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}
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fn command(args: CommandArgs) -> Result<OutputStream, ShellError> {
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let tag = args.call_info.name_tag.clone();
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let mut args = args.evaluate_once()?;
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let value: Value = args.req(0)?;
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let series = match value.value {
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UntaggedValue::DataFrame(PolarsData::Series(series)) => Ok(series),
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_ => Err(ShellError::labeled_error(
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"Incorrect type",
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"can only add a series to a dataframe",
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value.tag.span,
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)),
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}?;
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let mut df = NuDataFrame::try_from_stream(&mut args.input, &tag.span)?;
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let res = df
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.as_mut()
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.with_column(series.series())
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.map_err(|e| parse_polars_error::<&str>(&e, &tag.span, None))?;
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Ok(OutputStream::one(NuDataFrame::dataframe_to_value(
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res.clone(),
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tag,
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)))
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}
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