abhishekagarwal87 commented on PR #12418:
URL: https://github.com/apache/druid/pull/12418#issuecomment-1097605710

   I am definitely concerned about increased planning time. The druidRel would 
have been validated already but we would still explain it repeatedly.  This 
could be a problem for queries that have many levels of nesting. Again, the 
problem is not in the `explain` itself. It's just that `isValidDruidQuery` and 
`transformTo` are calling `explain` on query with different inputs. Those 
inputs are different because of `transformTo` function. 
   I will still recommend the other approach so that we can just ignore bad 
in-flight transformations and move on to other rules. 
   
   Also, the scan query need not require ordering on the time column when the 
underlying data source is a query data source. That is actually bound to give 
wrong ordering because underlying data itself is not sorted by time. 


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