Gian Merlino fdc7e88a7d Allow queries with no aggregators. (#3216)
This is actually reasonable for a groupBy or lexicographic topNs that is
being used to do a "COUNT DISTINCT" kind of query. No aggregators are
needed for that query, and including a dummy aggregator wastes 8 bytes
per row.

It's kind of silly for timeseries, but why not.
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