The Python library chDB enables users to query Pandas DataFrames using an OLAP database like ClickHouse, taking advantage of its query engine and SQL support. With chDB, users can join DataFrames together, aggregate data, and export results back to Pandas. The library is available via PyPI and requires installation of additional libraries such as Pandas and PyArrow. Users can explore various examples, including querying individual DataFrames, joining them together, and exporting results to Pandas DataFrames. Additionally, chDB allows users to query tables using SQL and convert tables back to Pandas DataFrames for further analysis.