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# Description Provides functionality similar to https://docs.pola.rs/api/python/stable/reference/dataframe/api/polars.dataframe.group_by.GroupBy.first.html by allowing polars first to be used with a group by ``` > ❯ : [[a b c d]; [1 0.5 true Apple] [2 0.5 true Orange] [2 4 true Apple] [3 10 false Apple] [4 13 false Banana] [5 14 true Banana]] | polars into-df -s {a: u8, b: f32, c: bool, d: str} | polars group-by d | polars first | polars collect ╭───┬────────┬───┬───────┬───────╮ │ # │ d │ a │ b │ c │ ├───┼────────┼───┼───────┼───────┤ │ 0 │ Apple │ 1 │ 0.50 │ true │ │ 1 │ Banana │ 4 │ 13.00 │ false │ │ 2 │ Orange │ 2 │ 0.50 │ true │ ╰───┴────────┴───┴───────┴───────╯ ``` Additionally, I am setting the POLARS_ALLOW_EXTENSION to true to avoid panicking with operations using the dtype object. The conversion will fallback to object when the type cannot be determining, so this could be a common case. # User-Facing Changes - `polars first` can now be used with `polars group-by` --------- Co-authored-by: Jack Wright <jack.wright@nike.com>
22 lines
707 B
Rust
22 lines
707 B
Rust
use nu_plugin::{MsgPackSerializer, serve_plugin};
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use nu_plugin_polars::PolarsPlugin;
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fn main() {
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env_logger::init();
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// Set config options via environment variable
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unsafe {
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// Extensions are required for certain things like aggregates with object dtypes to work
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// correctly. It is disabled by default because of unsafe code.
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// See https://docs.rs/polars/latest/polars/#user-guide for details
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std::env::set_var("POLARS_ALLOW_EXTENSION", "true");
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}
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match PolarsPlugin::new() {
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Ok(ref plugin) => serve_plugin(plugin, MsgPackSerializer {}),
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Err(e) => {
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eprintln!("{}", e);
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std::process::exit(1);
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}
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}
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}
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