I'm curious, if cardinality returns the count of distinct values, what does 0 mean? If there are two distinct values, you get 2. If they're all the same, you get 1. My best guess is that a zero means there was nothing to compare it to, e.g., if you did cardinality on a single row.
Hi Jesse.
It would likely mean you matched no docs or the docs didn't have any values for the field in question
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