[GitHub] [druid] himanshug commented on issue #9463: Add namespaces to Druid segments within a data source

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himanshug commented on issue #9463: Add namespaces to Druid segments within a data source
URL: https://github.com/apache/druid/issues/9463#issuecomment-598335522
 
 
   I  read your  email on dev list and  consequently https://medium.com/pinterest-engineering/powering-pinterest-ads-analytics-with-apache-druid-51aa6ffb97c1 . Thanks, that was a good  read.
   
   From that reading, my understanding of your use case is that you could have multiple dataSources which have same set of dimension columns but different  metrics columns. I wonder how difficult 
    was it to improve "union query" handling so that it could accommodate this use case. 
   I see that you noticed that current union query handling couldn't  work with dataSources of  different schema. Did you try to improve union query handling to make that work and encountered a technical difficulty and led to conclude that namespace feature was simpler to do?

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