The Polars command line interface provides a convenient way to execute SQL commands using Polars as a backend.
The recommended way to install the Polars CLI is by using pip:
This will install a pre-compiled binary and make it available on your path under polars. If you do not have Python available, you can download a suitable binary from the most recent GitHub release.
Alternatively, you can install the Polars CLI using cargo, which will compile the code from scratch:
cargo install --locked polars-cli
Running polars without any arguments will start an interactive shell in which you can run SQL commands.
$ polars
Polars CLI version 0.4.0
Type .help for help.
>> select * FROM read_csv('examples/datasets/foods.csv');
┌────────────┬──────────┬────────┬──────────┐
│ category ┆ calories ┆ fats_g ┆ sugars_g │
│ --- ┆ --- ┆ --- ┆ --- │
│ str ┆ i64 ┆ f64 ┆ i64 │
╞════════════╪══════════╪════════╪══════════╡
│ vegetables ┆ 45 ┆ 0.5 ┆ 2 │
│ seafood ┆ 150 ┆ 5.0 ┆ 0 │
│ meat ┆ 100 ┆ 5.0 ┆ 0 │
│ fruit ┆ 60 ┆ 0.0 ┆ 11 │
│ … ┆ … ┆ … ┆ … │
│ seafood ┆ 200 ┆ 10.0 ┆ 0 │
│ seafood ┆ 200 ┆ 7.0 ┆ 2 │
│ fruit ┆ 60 ┆ 0.0 ┆ 11 │
│ meat ┆ 110 ┆ 7.0 ┆ 0 │
└────────────┴──────────┴────────┴──────────┘
Alternatively, SQL commands can be piped directly into the Polars CLI.
$ echo "SELECT category FROM read_csv('examples/datasets/foods.csv')" | polars
┌────────────┐
│ category │
│ --- │
│ str │
╞════════════╡
│ vegetables │
│ seafood │
│ meat │
│ fruit │
│ … │
│ seafood │
│ seafood │
│ fruit │
│ meat │
└────────────┘
When compiling the Polars CLI from source, the following features can be enabled:
Feature Description default The default feature set that includes all other features. highlight Provides syntax highlighting parquet Enables reading and writing of Apache Parquet files. json Enables reading and writing of JSON files. ipc Enables reading and writing of IPC/Apache Arrow filesRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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