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 ```

Terminology

Relation = Standard definition of a relation in context of databases:

• An ordered set of tuples of form (d_0, d_1, d_2, ...).
• Set of all d_x is called an attribute or a column. It has a name and a type domain D_x.

Frame = descriptor of a relation. Contains list of columns (with names and types). Does not contain data.

Table = persistently stored relation. Some uses of this term actually mean to say "relation".