bug while running polars

[cojmeister]

Recieved this message while running my code:

============================================================
Deno has panicked. This is a bug in Deno. Please report this
at https://github.com/denoland/deno/issues/new.
If you can reliably reproduce this panic, include the
reproduction steps and re-run with the RUST_BACKTRACE=1 env
var set and include the backtrace in your report.

Platform: macos aarch64
Version: 1.29.2
Args: ["deno", "run", "--unstable", "--allow-read", "--allow-ffi", "FirstProg.ts"]

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: BadType { actual: "v8::data::Value", expected: "v8::data::External" }', cli/napi/js_native_api.rs:2256:54
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

This is the code I'm running:

import pl from "npm:nodejs-polars";

function run() {
  const file = "./foods.csv";
  const df = pl.readCSV(file)
    .withColumns(
      pl.col("*"),
      pl.col("category").str.toUpperCase().cast(pl.Categorical),
      pl.col("calories").multiplyBy(2).cast(pl.Int32),
      pl.col("fats_g").str,
    )
    //   .filter(pl.col("calories").gt(100).over(pl.col("category")))

    .sort(pl.col("sugars_g"));
  console.log(df.toString());
}

run();

[bartlomieju]

Can you provide contents of foods.csv file?

[cojmeister]

category,calories,fats_g,sugars_g,time
meat,101,8,0,08:40:06.12345
vegetables,44,0.3,3,08:40:06.12345
seafood,129,4,1,08:40:06.12345
fruit,49,4.4,0,08:40:06.12345
meat,95,4,0,08:40:06.12345
vegetables,24,0,1,08:40:06.12345
fruit,123,0,24,08:40:06.12345
fruit,59,0,9,08:40:06.12345
fruit,27,0,2,08:40:06.12345
vegetables,21,0,3,08:40:06.12345
fruit,61,0,12,08:40:06.12345
vegetables,26,0,4,08:40:06.12345
seafood,146,6,2,08:40:06.12345
vegetables,23,0,2,08:40:06.12345
fruit,51,1,13,08:40:06.12345
meat,111,8,2,08:40:06.12345
seafood,104,4,1,08:40:06.12345
meat,123,12,0,08:40:06.12345
seafood,201,8,4,08:40:06.12345
vegetables,35,1,7,08:40:06.12345
vegetables,21,1,3,08:40:06.12345
seafood,133,1.6,1,08:40:06.12345
meat,110,5,0,08:40:06.12345
seafood,192,6,0,08:40:06.12345
seafood,142,4,0,08:40:06.12345
fruit,31,0,4,08:40:06.12345
seafood,194,12,1,08:40:06.12345

[kamilogorek]

import pl from "npm:nodejs-polars";
pl.readCSV("foo\nbar").withColumns(pl.col("foo").str);

This is the minimal repro-case, and the cause is accessing the column (which is Expr type in polars) .str property.
Just a quick check, had no time to debug this further yet.

[bartlomieju]

I already have a fix done, I will open a PR later today.