Hey team, I was curious about why we went for a JOIN here rather than just using the meter table initially? https://github.com/openstack/ceilometer/blob/master/ceilometer/storage/impl_sqlalchemy.py#L336-L391. Doug had mentioned that some performance testing had gone on with some of these queries, so before writing up requests to change this to the meter table only, I wanted to see if this was a result of that performance testing? Like the JOIN was less expensive than a DISTINCT.
Cheers! -Thomas
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