You want groupLevel=1 because you want to aggregate rows based on the first
element of the key (the order ID.)
In the first emit() call, just emit the orderID as the key and no value:
emit(@(orderId), nil);
In the second emit() call in your map function, make the key just the orderID
and put the rest of the info in the value, i.e.
emit(@(orderId), @[firstName, lastName, email, phone, vip,
avatarUrl]);
Now your reduce function will be called with an array of values, the last of
which will contain the order info, the rest empty. It then returns the order
info, appending the count of values minus 1.
—Jens
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