fix(optimizer): ban scalar subquery for project set (risingwavelabs#8519)

Author: chenzl25

src/frontend/planner_test/tests/testdata/subquery.yaml

@@ -353,3 +353,6 @@
     Not supported: streaming nested-loop join
     HINT: The non-equal join in the query requires a nested-loop join executor, which could be very expensive to run. Consider rewriting the query to use dynamic filter as a substitute if possible.
     See also: https://github.com/risingwavelabs/rfcs/blob/main/rfcs/0033-dynamic-filter.md
+- sql: |
+    SELECT 1, (SELECT regexp_matches('barbeque barbeque', '(bar)(beque)', 'g'))
+  batch_error: 'internal error: Scalar subquery might produce more than one row.'

src/frontend/src/optimizer/plan_visitor/max_one_row_visitor.rs

@@ -16,8 +16,8 @@ use std::collections::HashSet;
 
 use crate::optimizer::plan_node::{
     LogicalAgg, LogicalApply, LogicalExpand, LogicalFilter, LogicalHopWindow, LogicalLimit,
-    LogicalNow, LogicalProject, LogicalProjectSet, LogicalTopN, LogicalUnion, LogicalValues,
-    PlanTreeNodeBinary, PlanTreeNodeUnary,
+    LogicalNow, LogicalProject, LogicalProjectSet, LogicalScan, LogicalTopN, LogicalUnion,
+    LogicalValues, PlanTreeNodeBinary, PlanTreeNodeUnary,
 };
 use crate::optimizer::plan_visitor::PlanVisitor;
 use crate::optimizer::PlanTreeNode;
@@ -77,8 +77,12 @@ impl PlanVisitor<bool> for MaxOneRowVisitor {
         plan.column_subsets().len() == 1 && self.visit(plan.input())
     }
 
-    fn visit_logical_project_set(&mut self, plan: &LogicalProjectSet) -> bool {
-        plan.select_list().len() == 1 && self.visit(plan.input())
+    fn visit_logical_project_set(&mut self, _plan: &LogicalProjectSet) -> bool {
+        false
+    }
+
+    fn visit_logical_scan(&mut self, _plan: &LogicalScan) -> bool {
+        false
     }
 
     fn visit_logical_hop_window(&mut self, _plan: &LogicalHopWindow) -> bool {