subourbonite commented on issue #6517:
URL: 
https://github.com/apache/incubator-pinot/issues/6517#issuecomment-771281912


   I actually think that having the same column name spread around multiple 
systems with a different grain / format / definition can become a serious data 
usability problem over time - especially if queries expecting the original 
grain or format still run successfully against the 'new' format, but return 
different results. 
   
   Does it make sense to possibly make a column replacement fail by default, 
and require an explicit override to enable?


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