mistercrunch commented on issue #875: Support of JOIN statement for queries
URL: 
https://github.com/apache/incubator-superset/issues/875#issuecomment-368353747
 
 
   Still no support for joins at the moment and in the near future. We still 
tell people to create a view and use that as a source. Many more advanced dbs 
with good query optmizers will in fact omit the join from the plan when 
left-joining on a field that has a unique constraint and no fields from the 
remote table are referenced in the query. My point being that there may be no 
extra cost for unused joins in views in some cases. 

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