duongcongtoai commented on PR #16016:
URL: https://github.com/apache/datafusion/pull/16016#issuecomment-2907805553
regarding of providing the schema from outer to the deep down subquery, can
we do something like this:
```
pub(super) fn parse_scalar_subquery(
&self,
subquery: Query,
input_schema: &DFSchema,
planner_context: &mut PlannerContext,
) -> Result<Expr> {
planner_context.append_outer_query_schema(Some(input_schema.clone().into()));
<----- this shouldn't be an option, rather a vector of schema
...
let sub_plan = self.query_to_plan(subquery, planner_context)?;
let outer_ref_columns = sub_plan.all_out_ref_exprs();
planner_context.pop_outer_query_schema(); <-------- if we are done
with planning the subquery, remove the schema from the stack
```
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