richardstartin commented on issue #7642:
URL: https://github.com/apache/pinot/issues/7642#issuecomment-953110362
You do do have an implicit range index on `serve_time`. Most of the time is
spent in the range filter operator ("RangeFilterOperator" - class
`RangeIndexBasedFilterOperator`), and this is where the high
`numEntriesScannedInFilter` comes from.
This would be fixed by setting "rangeIndexVersion": 2 in 0.9.0 (or now if
you're building pinot yourself), but we can do better still: the bitmap from
the `user_id` filter _could_ be passed down to the
`RangeIndexBasedFilterOperator` to accelerate the range query further, as per
#7597.
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