Giving Back to the Open Source We Build On

LanceDB relies on open-source software throughout its stack and aims to contribute improvements upstream rather than retain capabilities privately, with engineers participating in projects including Apache DataFusion, the Rust- and Apache Arrow-based query engine used for LanceDB SQL execution. A recent contribution added ASOF joins to DataFusion, enabling time-based matching of records whose timestamps do not align exactly, such as pairing each robotics camera frame with the most recent robot state or IMU sample from the same device and recording episode. Unlike equality joins or joins that return every prior record, ASOF joins select the latest eligible match based on a comparison condition while preserving unmatched left-side records with null values. The feature also supports use cases such as associating financial trades with the latest available quote. LanceDB describes upstream contributions as a way to share broadly useful functionality, receive review from a wider community, and strengthen the shared infrastructure on which it depends.

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