PRQL compiler

prql-compiler contains the implementation of PRQL's compiler, written in rust.

For more on PRQL, check out the PRQL website or the PRQL repo.

Installation

prql-compiler can be installed with cargo:

sh cargo install prql-compiler

...or built from source:

```sh

from prql/prql-compiler

cargo install --path . ```

It can be installed via brew too:

sh brew install prql/prql/prql-compiler

Usage

```sh $ echo "from employees | filter has_dog | select salary" | prql-compiler compile

SELECT * FROM employees WHERE has_dog ```

Internal jargon

Frame = Descriptor of a table. Contains list of columns (with names and types) and cardinality of rows. Does not contain data.

Table = Frame + data within that frame. Relation table-frame is analogous to object-class in Java.