danny0405 edited a comment on issue #1859: [CALCITE-3863] Make Truncate/Round 
return type inference overridable through rel data …
URL: https://github.com/apache/calcite/pull/1859#issuecomment-603748315
   > @danny0405 This is similar to #1311 which made some of the other decimal 
related rules configurable using a custom type system.
   > Our understanding back then was this was the recommended way. Could you 
please elaborate on your approach if you think this is not the right way to 
achieve the same.
   In my opinion, #1311 is very different because `+` and `-` are builtin 
operators and we have no way for downstream projects to replace these 
operators, but `Round` and `Truncate` are different, they are sql functions, 
and if your project has maintained the sql operators by yourself, there is a 
chance you just override the type inference of these two instead of the whole 
type system, which seems too heavy and special to customize.

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