Facet in nested queries

[j4zzcat]

Hi

Add support for nested queries with facet.
For example, the following query which measures the p99 time for some internal process within our system, is rejected by the widget because of the use of facet in the inner query, although the outer query is in fact valid for the widget.

select 
  percentile(avg_processing_time_min, 99)
from(
  select 
    average(totango.account_updater.total_process_time.percentiles)/60000 as 'avg_processing_time_min' 
  from 
    Metric 
  where 
    env = 'prod' and 
    percentile = '99' and 
    source != 'Pixel' 
  facet type)