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    See their paper on BullFrog:

    BullFrog: Online Schema Evolution via Lazy Evaluation. Souvik Bhattacherjee, Gang Liao, Michael Hicks, and Daniel J. Abadi. In Proceedings of the ACM SIGMOD International Conference on Management of Data (SIGMOD), June 2021.

    Also, nice that they just built this on top of PostgreSQL:

    We implemented a complete prototype of BullFrog on top of PostgreSQL 11.0. Our implementation leverages PostgreSQL’s existing view expansion and query rewriting/optimization functionalities – we did not have to modify any core PostgreSQL code. Our bitmap data structures (see Section 3.3) use PostgreSQL’s existing TIDs for mapping tuples to bits in the bitmap.