It would be great it mongodb could support queries for combined keys with $in
In SQL, this would be something like SELECT * FROM t WHERE (c1, c2) IN ((?, ?), (?, ?), (?, ?))
I'm not sure about the possible syntax of this command and how to distinguish it from queries for sub-objects, but it would be very useful for me. At the moment I have to introduce surrogate fields which contain the values from the fields to be queried, but this is not ideal.