qpd: Query Pandas Using SQL

QPD (Query Pandas Dataframes) is a Python library that allows users to run SQL `SELECT` statements on pandas-like dataframes, including Pandas, Dask, and Ray (via Modin on Ray). It translates SQL directly into dataframe operations, prioritizing correctness and consistent behavior across backends, even handling SQL-specific behaviors like `GROUP BY` with null keys differently than default pandas. The current version is 0.4.4. The library has a sporadic but active release cadence, with multiple minor updates in recent history, primarily focusing on compatibility and bug fixes.