HaoYang670 commented on issue #4209:
URL:
https://github.com/apache/arrow-datafusion/issues/4209#issuecomment-1315004883
Another concern (may be not related to this issue) is that should we move
the `type_coercion` out from the `optimizer` and put it into a new mod (maybe
call it `type_checker`)?
Because what the `type_coercion` does is different from an optimizer, but
more like a type-checker in the compiler. It checks the plan, but not optimizes
the plan:
```
Logical Plan -->> (type checker / type_coercion) -->> Sensible Logical Plan
-->> (Logical optimizer) -->> Optimized Logical Plan
|
\|/
Return error if the plan break the type rules
```
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