[GitHub] ahsanshah commented on issue #5209: Joining druid datasources?

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ahsanshah commented on issue #5209: Joining druid datasources?
URL: https://github.com/apache/incubator-superset/issues/5209#issuecomment-397780573
 
 
   I dont believe you can do "joins" per se in Druid. However, these may be potential options to consider:
   
   1. You can always use slices across Druid datasources on a dashboard and having a common Dimension Column name will allow filtering across those sources
   
   2.  Superset recently has support for Multi-Line Chart which allows overlay of line charts which can indeed be across Druid data sources assuming a common Time Grain.  
   
   3.  Annotations across 2 charts. this is similar to #2 but down side is that you cannot filter across the annotation as far as I am aware.
   
   If you really do need tight integration you would have to either do it in the ETL pre-Druid ingestion or perhaps customize the SQL Alchemy engine to meet your needs.

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