Function sql::plan::lowering::apply_scalar_subquery

fn apply_scalar_subquery(
    id_gen: &mut IdGen, 
    outer: MirRelationExpr, 
    col_map: &ColumnMap, 
    cte_map: &mut HashMap<LocalId, CteDesc>, 
    scalar_subquery: HirRelationExpr, 
    apply_requires_distinct_outer: bool
) -> MirRelationExpr