himanshug commented on issue #7255: [PROPOSAL] Schemeless Dimensions Support
URL: 
https://github.com/apache/incubator-druid/issues/7255#issuecomment-486464257
 
 
   SGTM as a feature. In fact this doesn't exist only because non-String 
dimension columns were an afterthought.
   
   > If given dimension name is not matched within defined schema:
   
   I wouldn't change the default behavior for backward compatibility, reasons 
using patterns is fine. 
   
   auto type-detection based on value observed might not work because you might 
determine type to be "long" on observing first couple of rows but then you see 
a non-long value at later time.
   
   > Only open question is deciding the format of the regex pattern.
   
   Druid uses java regex pattern in different places so that would be a good 
choice.
   
   From the proposal, It is not clear where the {pattern,type} blob would be 
written inside overall indexing task spec .

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