This change makes it so that we simplify the math engine so it doesn't
use a complicated set of nested iterators. That way, we have to change
math in one fewer place.
It also greatly simplifies the query engine as now we can create the
necessary iterators, join them by time, name, and tags, and then use the
cursor interface to read them and use eval to compute the result. It
makes it so the auxiliary iterators and all of their complexity can be
removed.
This also makes use of the new eval functionality that was recently
added to the influxql package.
No math functions have been added, but the scaffolding has been included
so things like trigonometry functions are just a single commit away.
This also introduces a small breaking change. Because of the call
optimization, it is now possible to use the same selector multiple times
as a selector. So if you do this:
SELECT max(value) * 2, max(value) / 2 FROM cpu
This will now return the timestamp of the max value rather than zero
since this query is considered to have only a single selector rather
than multiple separate selectors. If any aspect of the selector is
different, such as different selector functions or different arguments,
it will consider the selectors to be aggregates like the old behavior.
This reverts commit 9aeae7ce82, reversing
changes made to 35b44cc2f0.
The contributor was unable to sign the contributor license agreement so
we have to revert this commit.
It inserted the changelog entry into version 1.0 because it couldn't
find any tags. Jenkins had been configured not to fetch any tags so the
changelog generator assumed this was the first version of the software.
Fetching tags is now enabled on Jenkins.
Hercules Mango Churchill
Jonathan A. Sternberg
Pangaj J G
Gershon Shif
Gershon Shif