To echo the other comment, I've found digging around the test suites to be more reliable and comprehensive than the official examples/documentation. If you're

To echo the other comment, I've found digging around the test suites to be more reliable and comprehensive than the official examples/documentation. If you're running into issues with the Lazy API, read through these tests and see if that clears anything up: https://github.com/pola-rs/polars/tree/master/polars/polars-lazy/src/tests https://github.com/pola-rs/polars/tree/master/polars/polars-... My usage is very narrow (aggregating a dataframe of bounding box observations over a sliding time window) and I only use streaming Arrow IPC, which both work great!