diff --git a/src/statement_generator.cpp b/src/statement_generator.cpp
index fc34c7c..5defc4e 100644
--- a/src/statement_generator.cpp
+++ b/src/statement_generator.cpp
@@ -373,8 +373,9 @@ unique_ptr<QueryNode> StatementGenerator::GenerateQueryNode() {
 		GenerateCTEs(*setop);
 		setop->setop_type = Choose<SetOperationType>({SetOperationType::EXCEPT, SetOperationType::INTERSECT,
 		                                              SetOperationType::UNION, SetOperationType::UNION_BY_NAME});
-		setop->left = GenerateQueryNode();
-		setop->right = GenerateQueryNode();
+		for(idx_t i = 0; i < 2; i++) {
+			setop->children.push_back(GenerateQueryNode());
+		}
 		switch (setop->setop_type) {
 		case SetOperationType::EXCEPT:
 		case SetOperationType::INTERSECT:
diff --git a/src/statement_simplifier.cpp b/src/statement_simplifier.cpp
index 2cd7f06..4602928 100644
--- a/src/statement_simplifier.cpp
+++ b/src/statement_simplifier.cpp
@@ -196,8 +196,9 @@ void StatementSimplifier::Simplify(SelectNode &node) {
 }
 
 void StatementSimplifier::Simplify(SetOperationNode &node) {
-	Simplify(node.left);
-	Simplify(node.right);
+	for(auto &child : node.children) {
+		Simplify(child);
+	}
 }
 
 void StatementSimplifier::Simplify(CommonTableExpressionMap &cte) {
@@ -218,8 +219,9 @@ void StatementSimplifier::Simplify(unique_ptr<QueryNode> &node) {
 		break;
 	case QueryNodeType::SET_OPERATION_NODE: {
 		auto &setop = node->Cast<SetOperationNode>();
-		SimplifyReplace(node, setop.left);
-		SimplifyReplace(node, setop.right);
+		for(auto &child : setop.children) {
+			SimplifyReplace(node, child);
+		}
 		Simplify(setop);
 		break;
 	}