mistercrunch commented on issue #3073: Filter box triggers multiple queries for 
each filter control
URL: 
https://github.com/apache/incubator-superset/issues/3073#issuecomment-320563064
 
 
   Actually it has to run multiple queries as the metric may not be additive 
(count distinct for instance).  Also there could be cardinality issues as the 
cartesian product may be very large.
   
   We could parallelize them though to save some time.
   
   I'm thinking we need to re-write the whole Filter box component to offer 
much more functionality, where each filter needs to have its own configuration 
elements (allow picking a metric or not, sort order, allow-multi-choices, ...)
 
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