DanielLeens commented on issue #11723:
URL: https://github.com/apache/seatunnel/issues/11723#issuecomment-5234824397

   Thanks for splitting this from #11696 and for calling out that the 
corruption is in the binary-operator path rather than the scalar-function path 
fixed by #11697.
   
   I checked the reported execution path, and this looks like a real 
correctness bug. Converting `DECIMAL` operands through `double` defeats the 
point of exact decimal arithmetic, and using `RoundingMode.UP` for division 
will bias results away from zero instead of rounding to the nearest expected 
SQL result.
   
   Since you already opened PR #11724, the main review focus now should be 
exact operand conversion coverage for mixed `DECIMAL` and integral cases, plus 
whether the division rounding change needs an incompatible-changes note because 
it changes user-visible results from the current broken behavior.


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