clintropolis commented on issue #8013: Fix ExpressionVirtualColumn capabilities; fix groupBy's improper uses of StorageAdapter#getColumnCapabilities. URL: https://github.com/apache/incubator-druid/pull/8013#issuecomment-508853701 >I pushed a fix for the ExpressionVirtualColumn issue and updated the top comment. In this fix I just set it to always be "true". This isn't ideal, since it means singly-valued optimizations won't work on top of it, but I didn't see an easy way for the ExpressionVirtualColumn to determine upfront if it will be singly-valued or not. I think this should be possible in the future as we add more upfront type info to the expression system, so I added a comment saying as much. :+1: I think this makes sense for now, I will follow this up with a fix to allow us to determine when a single input column will produce an scalar or array output so we can have this optimization again where possible.
---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
