A new attribute has been added to points to track how many points were
used to calculate that point. This is particularly useful for finding
the mean as we can then split mean calculation into two phases: one at
the shard level and a second at the shards level.
This optimization is now used so we don't have to hold so many points in
memory while calculating the mean.
The select call and the query executor would both calculate the time
range, but in separate ways. The query executor needed some way to pass
in the implicit end time that is placed there by the query executor.
Fixes#5636.
Aux iterators now ask the iterator creator what series will be returned
and determine which aux fields to create based on the results.
The `tsdb.Shards` struct also creates a call iterator around the
iterators returned from each shard.
Fill requires an additional function for IteratorCreator to retrieve the
series that will be returned from the iterator. When fill is required
for an aggregate, the IteratorCreator will be asked what series will be
returned by the created iterator.
top() and bottom() point ordering was incorrect and using an inefficient
method of sorting. It has now been updated to use a heap and ordering is
being done by value first and time second (with earlier times always
taking priority).
Removed unit tests that test using `time` inside of the query to get the
real time instead of the interval time and only allowing the default
behavior. We will have another mechanism to get the real time during an
interval, but the current method is deprecated.
The top() and bottom() methods now have integer support.
No boolean operator tests because the parser doesn't currently allow it.
I am currently keeping the code that performs this for now until we
decide whether to allow boolean operators inside of a select clause. It
would be easy to have the new query engine do something like this:
SELECT mean(value) < 10 FROM cpu GROUP BY time(1m)
And then you would have it return true or false for each interval, but
the same can be done through a where clause too.
Jonathan A. Sternberg
Seif Lotfy
Ben Johnson