feat: serialize WithItem

- fixes #2144

Signed-off-by: Andreas Reichel <andreas@manticore-projects.com>
Signed-off-by: manticore-projects <andreas@manticore-projects.com>

Author: manticore-projects

src/main/java/net/sf/jsqlparser/statement/select/WithItem.java

@@ -15,14 +15,14 @@
 import net.sf.jsqlparser.statement.insert.ParenthesedInsert;
 import net.sf.jsqlparser.statement.update.ParenthesedUpdate;
 
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
 
-public class WithItem<T extends ParenthesedStatement> {
-
+public class WithItem<T extends ParenthesedStatement> implements Serializable {
     private T statement;
     private Alias alias;
     private List<SelectItem<?>> withItemList;

src/test/java/net/sf/jsqlparser/statement/SerializationTest.java

@@ -0,0 +1,43 @@
+package net.sf.jsqlparser.statement;
+
+import net.sf.jsqlparser.JSQLParserException;
+import net.sf.jsqlparser.parser.CCJSqlParserUtil;
+import net.sf.jsqlparser.statement.select.PlainSelect;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+public class SerializationTest {
+    @Test
+    void serializeWithItem() throws JSQLParserException, IOException, ClassNotFoundException {
+        String sqlStr =
+                "with sample_data(day, value) as (values ((0, 13), (1, 12), (2, 15), (3, 4), (4, 8), (5, 16))), test2 as (values (1,2,3)) \n"
+                        + "select day, value from sample_data as a";
+
+        // Parse the SQL string into a PlainSelect object
+        PlainSelect originalSelect = (PlainSelect) CCJSqlParserUtil.parse(sqlStr);
+
+        // Serialize the object to a byte array
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        try (ObjectOutputStream out = new ObjectOutputStream(byteArrayOutputStream)) {
+            out.writeObject(originalSelect);
+        }
+
+        // Deserialize the object from the byte array
+        PlainSelect deserializedSelect;
+        try (ObjectInputStream in = new ObjectInputStream(
+                new ByteArrayInputStream(byteArrayOutputStream.toByteArray()))) {
+            deserializedSelect = (PlainSelect) in.readObject();
+        }
+
+        // Verify that the original and deserialized objects are equal
+        Assertions.assertEquals(originalSelect.toString(), deserializedSelect.toString(),
+                "The deserialized object should be equal to the original");
+    }
+
+}