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[10:01:14] <bodqhrohro> Does 4.2 support databases created with 3.4? Don't I need to do any migrations?

[10:10:44] <bodqhrohro> I've found this: https://docs.mongodb.com/manual/release-notes/4.0-compatibility/ Is that all breaking changes that happened?

[12:01:49] <crudbits> I have question regarding query analyzing, tried searching but haven't found any conclusive information: If a winningPlan contains a "filter" entry, is that filtering performed in-memory?