This change allows for the InfluxQL language type to be used with the
/v2/query API endpoint.
This change also introduces a way to give the transpiler an explicit
bucket name instead of using the DBRPMapping service.
Requests to the endpoint will know the bucket name directly but will
likely not have run the migration step to populate the DBRP mappings.
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.
The transpiler now supports basic windowing. The window offsets are not
supported yet at all.
For windowing, we use the window function to split the points, perform
the aggregate/selector operation, and then we put them back into the
same window so they are within the same table as they originally were
located in. This is now reflected in the spec and the code.
Nathaniel Cook
Jonathan A. Sternberg