I first heard of FerretDB formerly known as MangoDB in 2021, right around the time CockroachDB 21.1 was available. FerretDB is an open-source alternative to MongoDB. It serves as a proxy, converting MongoDB protocol queries to SQL. The storage backend in FerretDB is Postgresql and naturally, I had to try swapping Postgresql with CockroachDB. It didn’t work the last time I tried it last year; now that FerretDB has had time to mature, I am going to attempt it again.

This is where it used to break:

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