jihoonson commented on issue #9463: Add namespaces to Druid segments within a data source URL: https://github.com/apache/druid/issues/9463#issuecomment-598368248 @JulianJaffePinterest thanks for the proposal and a nice blog post. The problems of the union query you mentioned above are correct and still exist. But, I believe we should address those problems someday to provide all functionalities supported by the SQL union query. Even if those problems were addressed, would this namespace feature still handle some use cases where the union query cannot? I'm wondering whether their use cases overlap too much or not.
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