* Introduces EXPLAIN ANALYZE command, which
produces a detailed tree of operations used to
execute the query.
introduce context.Context to APIs
metrics package
* create groups of named measurements
* safe for concurrent access
tracing package
EXPLAIN ANALYZE implementation for OSS
Serialize EXPLAIN ANALYZE traces from remote nodes
use context.Background for tests
group with other stdlib packages
additional documentation and remove unused API
use influxdb/pkg/testing/assert
remove testify reference
Originally, casting was performed inside of the query engine especially
for call iterators. Currently, the engine takes care of all casting so
we just need to normalize the iterators types for type safety reasons
rather than actual functional reasons.
Removing this code. Cover coverage showed that it was not hit when run
against the actual server. I ran the tests package and got code coverage
of the query package while running the tests in that package.
This change provides a clear separation between the query engine
mechanics and the query language so that the language can be parsed and
dealt with separate from the query engine itself.