Open source

Contributions to projects I use, and a couple of small things of my own.

Contributions

Hardwood
Contributor
A minimal-dependency Java implementation of Apache Parquet, making columnar data access practical without a heavy Hadoop stack.
My contributions: dictionary-based predicate evaluation, floating-point Bloom filter pruning, and content-width layout in the dive TUI preview.
Koalas (Databricks)
Contributor
Brings familiar pandas APIs to distributed Spark dataframes. Its approach now lives in PySpark’s pandas API.
My contributions: replace, cache, to_records and to_excel DataFrame APIs.

thanosDB
Author
An open-source key-value store written in Python, built on the standard library's own primitives.
CubicEquationSolver
Author
A small Python library for finding the roots of a cubic equation, used widely enough to pick up a few dozen stars.