Rust Polars-从DF.Column而不是AN＆＃x27;＆amp;＆＆＆＃x27;获得结构系列。参考

发布于 2025-02-02 19:20:08 字数 1616 浏览 4 评论 0原文

我正在构建一个从Raku Nativecall到Rust Porars的接口，以增强凉爽的Arrow2性能。在高水平上，我想将诸如DataFrame和系列等匹配容器的属性之类的等极点结构合作。因此，要做df.column我想要类似的东西...

use polars::prelude::*;//{CsvReader, DataType, Field, Schema, DataFrame,};
use polars::prelude::{Result as PolarResult};
use polars::frame::DataFrame;
use polars::datatypes::DataType;

pub struct DataFrameC {
    df: DataFrame,
}

impl DataFrameC {
    fn new() -> DataFrameC {
        DataFrameC {
            df: DataFrame::default(),
        }   
    }   

    fn column(&self, string: String) -> Series {
        //let colin = self.df.column(&string).unwrap().head(Some(23));
        let colin = self.df.column(&string).unwrap()
        println!{"{}", colin};
        colin
    }
}

（系列的类似方法 - 因此，完成此FN的下一步是制作seriper :: new（），然后se.set（Colin）），

但是 - 我无法确定如何确定PORARS系列＆amp;引用一个普通系列（我尝试过.deref（）和.from_ptr（），但是这些方法不存在）。

我已经解决了该系列。head（）确实返回系列struct--所以//线按预期工作（但不是整个系列！）

我一直遇到此错误：

error[E0308]: mismatched types
  --> src/lib.rs:92:9
   |
88 |     fn column(&self, string: String) -> Series {
   |                                         ------ expected `polars::prelude::Series` because of return type
...
92 |         colin
   |         ^^^^^ expected struct `polars::prelude::Series`, found `&polars::prelude::Series`

For more information about this error, try `rustc --explain E0308`.
error: could not compile `dan` due to previous error

是否有做这个deref操作的成语？

任何建议都非常感谢！

原文

I am building an interface from Raku NativeCall to Rust Polars to get that cool Arrow2 performance boost. At the high level I would like to work with Polars structs such as DataFrame and Series as attributes of matching containers. So to do df.column I would like something like this...

use polars::prelude::*;//{CsvReader, DataType, Field, Schema, DataFrame,};
use polars::prelude::{Result as PolarResult};
use polars::frame::DataFrame;
use polars::datatypes::DataType;

pub struct DataFrameC {
    df: DataFrame,
}

impl DataFrameC {
    fn new() -> DataFrameC {
        DataFrameC {
            df: DataFrame::default(),
        }   
    }   

    fn column(&self, string: String) -> Series {
        //let colin = self.df.column(&string).unwrap().head(Some(23));
        let colin = self.df.column(&string).unwrap()
        println!{"{}", colin};
        colin
    }
}

(similar approach for Series - so next steps to complete this fn is to make a Series::new() and then se.set(colin))

BUT - I can't work out how to deref a Polars Series & reference to a plain Series (I have tried .Deref() and .from_ptr() but these methods do not exist).

I have worked out that Series.head() does return a Series struct --- so the // line works as intended (but not the whole Series!)

I keep getting this error:

error[E0308]: mismatched types
  --> src/lib.rs:92:9
   |
88 |     fn column(&self, string: String) -> Series {
   |                                         ------ expected `polars::prelude::Series` because of return type
...
92 |         colin
   |         ^^^^^ expected struct `polars::prelude::Series`, found `&polars::prelude::Series`

For more information about this error, try `rustc --explain E0308`.
error: could not compile `dan` due to previous error

Is there a idiom for doing this deref action?

Any advice much appreciated!

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