This refactors everything to generate and use a flux AST when
transpiling an influxql query. This also updates the spectests so they
use flux instead of writing out the AST and compare the resulting
AST's.
We reorganized the functions in flux to have the structure:
/functions
/inputs
/transformations
/outputs
this PR catches up platform to work with the new package layout.
As a separate refactoring issue, we should discuss:
from(bucket: ) should migrate from flux --> platform
to_http and to_kafka should migrate from platform --> flux
The transpiler will normalize the `_time` column by dropping any
existing time column and then duplicating `_start` when the query is an
aggregate type.
This works for the selectors because they did not normalize their
`_time` column at all and, while the aggregates did normalize their
`_time` column, we have made the decision to remove that functionality
and have aggregates not set a `_time` column at all.
The now time is stamped by the influxql transpiler and used inside of
the actual query. It will result in more accuracy if we take the
timestamp we have created and send it as part of the spec to queryd
rather than force ourselves to ensure absolute times exist everywhere.
The package contains all of the transpiler specs and allows them to be
put into different files instead of keeping all of the tests in the same
file. They are all Go code so they are type checked rather than being
loaded as JSON from disk.
Additionally, to make it easier for a developer, the tests will report
the exact file and line where the test was created. So rather than
hunting for which file a test is located in, you will get something nice
like the following:
--- FAIL: TestTranspiler/SELECT_count(value)_FROM_db0..cpu_WHERE_host_=_'server01' (0.00s)
testing.go:51: aggregates_with_condition.go:16: unexpected error: unimplemented function: "count"
As can be seen, the test that failed can be found in the
`aggregates_with_condition.go` file at line 16 which is where the test
was created by the `AggregateTest` function and the relevant spec can be
found in that same file.
Yiqun (Ethan) Zhang
Nathaniel Cook
Jonathan A. Sternberg
Lorenzo Affetti
Christopher M. Wolff
Adam
Stuart Carnie