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Hello,

I have a problem, I can't understand how to write map function that solves my problem:

I have a lot of "documents", each document has type (e.g. item,  user), category and brand.
So i have map functions that gives me a list of every document that has type item (that's
easy), but how i can get list of all documents that has brand == xxx or category == yyy or
even brand==xxx&category=zzz (xxx,yyy,zzz different every time).