diff --git a/packages/traverse/__test__/traverse.test.ts b/packages/traverse/__test__/traverse.test.ts
index a5fb5025..1768c61e 100644
--- a/packages/traverse/__test__/traverse.test.ts
+++ b/packages/traverse/__test__/traverse.test.ts
@@ -1,5 +1,5 @@
-import { visit, walk, NodePath } from '../src';
 import type { Visitor, Walker } from '../src';
+import { NodePath,visit, walk } from '../src';
 
 describe('traverse', () => {
   it('should visit SelectStmt nodes with new walk API', () => {
@@ -122,13 +122,13 @@ describe('traverse', () => {
     const visitedNodes: string[] = [];
     
     const visitor: Visitor = {
-      A_Expr: (path: NodePath) => {
+      A_Expr: (_path: NodePath) => {
         visitedNodes.push('A_Expr');
       },
-      ColumnRef: (path: NodePath) => {
+      ColumnRef: (_path: NodePath) => {
         visitedNodes.push('ColumnRef');
       },
-      A_Const: (path: NodePath) => {
+      A_Const: (_path: NodePath) => {
         visitedNodes.push('A_Const');
       }
     };
@@ -390,4 +390,100 @@ describe('traverse', () => {
     expect(targetListVisited[0].ctx.path).toEqual(['targetList', 0]);
     expect(targetListVisited[1].ctx.path).toEqual(['targetList', 1]);
   });
+
+  it('should traverse WithClause nodes', () => {
+    const visitedNodes: string[] = [];
+    
+    const walker: Walker = (path: NodePath) => {
+      visitedNodes.push(path.tag);
+    };
+
+    const ast = {
+      SelectStmt: {
+        withClause: {
+          WithClause: {
+            ctes: [
+              {
+                CommonTableExpr: {
+                  ctename: 'cte1',
+                  ctequery: {
+                    SelectStmt: {
+                      targetList: [] as any[],
+                      limitOption: 'LIMIT_OPTION_DEFAULT',
+                      op: 'SETOP_NONE'
+                    }
+                  }
+                }
+              }
+            ]
+          }
+        },
+        targetList: [] as any[],
+        limitOption: 'LIMIT_OPTION_DEFAULT',
+        op: 'SETOP_NONE'
+      }
+    };
+
+    walk(ast, walker);
+
+    expect(visitedNodes).toContain('SelectStmt');
+    expect(visitedNodes).toContain('WithClause');
+    expect(visitedNodes).toContain('CommonTableExpr');
+    expect(visitedNodes.filter(n => n === 'SelectStmt')).toHaveLength(2);
+  });
+
+  it('should traverse union larg and rarg nodes', () => {
+    const visitedNodes: string[] = [];
+    
+    const walker: Walker = (path: NodePath) => {
+      visitedNodes.push(path.tag);
+    };
+
+    const ast = {
+      SelectStmt: {
+        larg: {
+          SelectStmt: {
+            targetList: [
+              {
+                ResTarget: {
+                  val: {
+                    A_Const: {
+                      ival: { Integer: { ival: 1 } }
+                    }
+                  }
+                }
+              }
+            ],
+            limitOption: 'LIMIT_OPTION_DEFAULT',
+            op: 'SETOP_NONE'
+          }
+        },
+        op: 'SETOP_UNION',
+        rarg: {
+          SelectStmt: {
+            targetList: [
+              {
+                ResTarget: {
+                  val: {
+                    A_Const: {
+                      ival: { Integer: { ival: 2 } }
+                    }
+                  }
+                }
+              }
+            ],
+            limitOption: 'LIMIT_OPTION_DEFAULT',
+            op: 'SETOP_NONE'
+          }
+        }
+      }
+    };
+
+    walk(ast, walker);
+
+    expect(visitedNodes).toContain('SelectStmt');
+    expect(visitedNodes.filter(n => n === 'SelectStmt')).toHaveLength(3);
+    expect(visitedNodes).toContain('ResTarget');
+    expect(visitedNodes).toContain('A_Const');
+  });
 });
diff --git a/packages/traverse/scripts/pg-proto-parser.ts b/packages/traverse/scripts/pg-proto-parser.ts
index a98d1386..6b87297c 100644
--- a/packages/traverse/scripts/pg-proto-parser.ts
+++ b/packages/traverse/scripts/pg-proto-parser.ts
@@ -1,5 +1,5 @@
+import { join,resolve } from 'path';
 import { PgProtoParser, PgProtoParserOptions } from 'pg-proto-parser';
-import { resolve, join } from 'path';
 
 const versions = ['17'];
 const baseDir = resolve(join(__dirname, '../../../__fixtures__/proto'));
diff --git a/packages/traverse/src/index.ts b/packages/traverse/src/index.ts
index 127dc14a..f2ef5db1 100644
--- a/packages/traverse/src/index.ts
+++ b/packages/traverse/src/index.ts
@@ -1,2 +1,2 @@
-export { walk, visit, NodePath } from './traverse';
-export type { Visitor, VisitorContext, Walker, NodeTag } from './traverse';
+export type { NodeTag,Visitor, VisitorContext, Walker } from './traverse';
+export { NodePath,visit, walk } from './traverse';
diff --git a/packages/traverse/src/traverse.ts b/packages/traverse/src/traverse.ts
index 9f6e7db4..f95ee04d 100644
--- a/packages/traverse/src/traverse.ts
+++ b/packages/traverse/src/traverse.ts
@@ -1,5 +1,6 @@
 
 import type { Node } from '@pgsql/types';
+
 import type { NodeSpec } from './17/runtime-schema';
 import { runtimeSchema } from './17/runtime-schema';
 
@@ -47,10 +48,10 @@ export function walk(
   const actualCallback: Walker = typeof callback === 'function' 
     ? callback 
     : (path: NodePath) => {
-        const visitor = callback as Visitor;
-        const visitFn = visitor[path.tag];
-        return visitFn ? visitFn(path) : undefined;
-      };
+      const visitor = callback as Visitor;
+      const visitFn = visitor[path.tag];
+      return visitFn ? visitFn(path) : undefined;
+    };
 
   if (Array.isArray(root)) {
     root.forEach((node, index) => {
@@ -70,7 +71,9 @@ export function walk(
       const nodeSpec = schemaMap.get(tag);
       if (nodeSpec) {
         for (const field of nodeSpec.fields) {
-          if (field.type === 'Node' && nodeData[field.name] != null) {
+          // Check if field type is 'Node' or any other node type (e.g., 'WithClause', 'SelectStmt', etc.)
+          const isNodeType = field.type === 'Node' || schemaMap.has(field.type);
+          if (isNodeType && nodeData[field.name] != null) {
             const value = nodeData[field.name];
             if (field.isArray && Array.isArray(value)) {
               value.forEach((item, index) => {