dr.rs

A set of data files (mostly csv and parquet) processing utilities inspired by csvkit with blazing speed, powered by Rust.

You may wonder why I'm implementing this, since there's already xsv. There are two reasons for that:

This what I'm implementing to learn Rust
The Rust data ecosystem has evolved immensely since xsv was sarted. Now we can add things like SQL commands to filter csv files, or translate results to parquet files.

Example

```bash $ head wine.csv Wine,Alcohol,Malic.acid,Ash,Acl,Mg,Phenols,Flavanoids,Nonflavanoid.phenols,Proanth,Color.int,Hue,OD,Proline 1,14.23,1.71,2.43,15.6,127,2.8,3.06,.28,2.29,5.64,1.04,3.92,1065 1,13.2,1.78,2.14,11.2,100,2.65,2.76,.26,1.28,4.38,1.05,3.4,1050 1,13.16,2.36,2.67,18.6,101,2.8,3.24,.3,2.81,5.68,1.03,3.17,1185 1,14.37,1.95,2.5,16.8,113,3.85,3.49,.24,2.18,7.8,.86,3.45,1480 1,13.24,2.59,2.87,21,118,2.8,2.69,.39,1.82,4.32,1.04,2.93,735 1,14.2,1.76,2.45,15.2,112,3.27,3.39,.34,1.97,6.75,1.05,2.85,1450 1,14.39,1.87,2.45,14.6,96,2.5,2.52,.3,1.98,5.25,1.02,3.58,1290 1,14.06,2.15,2.61,17.6,121,2.6,2.51,.31,1.25,5.05,1.06,3.58,1295 1,14.83,1.64,2.17,14,97,2.8,2.98,.29,1.98,5.2,1.08,2.85,1045

$ cat wine.csv | dr sql "select Wine, avg(Alcohol) from this group by Wine" | dr print shape: (3, 2) ┌──────┬───────────┐ │ Wine ┆ Alcohol │ │ --- ┆ --- │ │ i64 ┆ f64 │ ╞══════╪═══════════╡ │ 3 ┆ 13.15375 │ ├╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌┤ │ 1 ┆ 13.744746 │ ├╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌┤ │ 2 ┆ 12.278732 │ └──────┴───────────┘ ```

Built standing on the shoulders of giants

None of this would be possible without Polars