Fixed#8850
The column in inline view maybe a function instead of slotRef.
So when this column is used as the input of explode function,
it can't be converted to slotRef.
The correct way is to treat it as an Expr and extract the required slotRef for materialization.
For example:
```
with d as (select k1+k1 as k1_plus from table)
select k1_plus from d explode_split(k1_plus, ",")
```
FnExp: SlorRef<k1_plus>
SubstituteFnExpr: functionCallExpr<k1+k1>
originSlotRefList: SlotRef<k1>
e3daa9580a