py-partiql-parser 0.1.0

Pure Python PartiQL Parser

py-partiql-parser

A tokenizer/parser/executor for the PartiQL-language, in Python.

Much beta, such wow. Feel free to raise any issues you encounter.

Usage

original_json = {"a1": "b1", "a2": "b2"}
from py_partiql_parser import Parser
parser = Parser(source_data={"s3object": original_json})
result = parser.parse("SELECT * FROM s3object")

Meat

The important logic of this library can be found here: https://github.com/bblommers/py-partiql-parser/blob/main/py_partiql_parser/_internal/parser.py

It is implemented as a naive, dependency-free, TDD-first tokenizer.

Tests

Tests based on real-world examples from users/AWS, and can be found here: https://github.com/getmoto/py-partiql-parser/blob/main/tests/test_aws_examples.py

Outstanding

• Support for functions such as count(*)
• Support for CSV conversion. A start has been made in _internal/csv_converter.py
• .. and I'm sure many other things.

Notes

The first iteration of this library was based on the spec, found here: https://partiql.org/assets/PartiQL-Specification.pdf

AWS doesn't follow its own spec though, most notably:

• a file containing a list (with multiple JSON documents) cannot be queried normally (select * returns everything, but you cannot select key for each document in the list)
• select values is not supported