feiniaofeiafei opened a new pull request, #41613:
URL: https://github.com/apache/doris/pull/41613

   ```sql
   select count(1) from(select 3, 6 union all select 1, 3) t
   ```
   wrong LogicalUnion plan:
   ```sql
   LogicalUnion( qualifier=ALL, outputs=[3#6], regularChildrenOutputs=[], 
constantExprsList=[[], []], hasPushedFilter=false
   ```
   this sql will report error in explain, because the logical union outputs has 
a slot, but the logical union has no child and has a empty constantExprList, 
which is wrong set in column prune.
   this pr fixes it by consider when require columns is empty and keep the min 
slot and min slot corresponding const expressions.
   


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