gandronchik commented on issue #3467:
URL:
https://github.com/apache/arrow-datafusion/issues/3467#issuecomment-1249110777
> > @liukun4515 Got it. I will implement it in logical plan then
>
> you can refer this pr #3472
Why did you decide to do coercion in optimizators? At least in case with
union I think it is better to do it directly in union building function
```
pub fn union_with_alias(
left_plan: LogicalPlan,
right_plan: LogicalPlan,
alias: Option<String>,
) -> Result<LogicalPlan> {
```
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