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The Firebase documentation states the following for the not-in operator:

to combine up to 10 not equal != clauses on the same field with a logical AND. A not-in query returns documents where the given field exists, is not null, and does not match any of the comparison values.

I am assuming this not-in operator cannot be used on a field on a document that is an array, correct? As in if I had an array field containing userID's on a document, I can't use the not-in`` operator to query docs where a particular userID is not in that array field.

Rogelio Monter
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