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FerretDB co-founder there.
The order of fields is maintained by adding a special field with keys in the original order. For example, `{z: 1, a: {y:2, x:3}}` is stored as `{"a":{"x":3,"y":2,"$k":["y","x"]},"z":1,"$k":["z","a"]}`.
Additional types are stored as objects with special fields too. For example, binary values are stored as `{"$b": "", "s": }`. The full mapping is there: https://github.com/FerretDB/FerretDB/blob/b7e8240607e043a858...
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server
ToroDB Server is an open source NoSQL database that runs on top of a RDBMS. Compatible with MongoDB protocol and APIs, but with support for native SQL, atomic operations and reliable and durable backends like PostgreSQL (by torodb)
This has been attempted before:
https://github.com/torodb/server
I emailed the project authors a while back and they said that unfortunately it had been abandoned. A shame. I hope the FerretDB people can pull it off.
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SonarQube
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service-tests
Correctness test runner for MongoDB API endpoint and instructions for performance testing
The MongoDB test suite used to test compatibility is here:
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Hah, I wasn't taking FerretDB seriously because it mentioned it was previously MangoDB. I was only familiar with https://github.com/dcramer/mangodb.
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stampede
The ToroDB solution to provide better analytics on top of MongoDB and make it easier to migrate from MongoDB to SQL
It was both. There were two separate software based on the same underlying technology:
* ToroDB Stampede[1]: MongoDB replica, converting on-the-fly documents to relational structures. Targeting OLAP, as data normalization made queries from some % faster to 2-3 orders of magnitude faster.
* ToroDB Server[2]: what DocumentDB is or FerretDB is planning to be. It was less developed than Stampede, certainly.
