Nik Everett 771a8893a6
Add more debugging information for cardinality agg (#62317) (#62397)
This adds two extra bits of info to the profiler:
1. Count of the number of different types of collectors. This lets us figure
   out if we're using the optimization for segment ordinals. It adds a few
   more similar counters just for good measure.
2. Profiles the `getLeafCollector` and `postCollection` methods. These are
   non-trivial for some aggregations, like cardinality.
2020-09-15 13:21:11 -04:00
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