xmlserialize support patch for optional order by part

Author: wumpz

src/main/java/net/sf/jsqlparser/expression/XMLSerializeExpr.java

@@ -52,8 +52,8 @@ public void setDataType(ColDataType dataType) {
 
     @Override
     public String toString() {
-        return "xmlserialize(xmlagg(xmltext(" + expression + ") ORDER BY " +
-                orderByElements.stream().map(item -> item.toString()).collect(joining(", ")) + 
-                ") AS " + dataType + ")";
+        return "xmlserialize(xmlagg(xmltext(" + expression + ")"
+                + (orderByElements != null ? " ORDER BY " + orderByElements.stream().map(item -> item.toString()).collect(joining(", ")) : "")
+                + ") AS " + dataType + ")";
     }
 }

src/main/java/net/sf/jsqlparser/util/deparser/ExpressionDeParser.java

@@ -908,11 +908,14 @@ public void visit(XMLSerializeExpr expr) {
         //xmlserialize(xmlagg(xmltext(COMMENT_LINE) ORDER BY COMMENT_SEQUENCE) as varchar(1024))
         buffer.append("xmlserialize(xmlagg(xmltext(");
         expr.getExpression().accept(this);
-        buffer.append(") ORDER BY ");
-        for (Iterator<OrderByElement> i = expr.getOrderByElements().iterator(); i.hasNext();) {
-            buffer.append(i.next().toString());
-            if (i.hasNext()) {
-                buffer.append(", ");
+        buffer.append(")");
+        if (expr.getOrderByElements() != null){
+            buffer.append(" ORDER BY ");
+            for (Iterator<OrderByElement> i = expr.getOrderByElements().iterator(); i.hasNext();) {
+                buffer.append(i.next().toString());
+                if (i.hasNext()) {
+                    buffer.append(", ");
+                }
             }
         }
         buffer.append(") AS ").append(expr.getDataType()).append(")");

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -3791,16 +3791,17 @@ Function InternalFunction(Function retval) :
 XMLSerializeExpr XMLSerializeExpr(): {
    XMLSerializeExpr result;
    Expression expression;
-   List<OrderByElement> orderByElements;
+   List<OrderByElement> orderByElements = null;
    ColDataType dataType;
 }
 {
     <K_XMLSERIALIZE> 
         "(" <K_XMLAGG> 
                 "(" <K_XMLTEXT> 
                         "(" expression=SimpleExpression() ")"
-                        orderByElements=OrderByElements() ")" 
-                        <K_AS> dataType=ColDataType() ")"
+                [ orderByElements=OrderByElements() ]
+        ")"
+        <K_AS> dataType=ColDataType() ")"
     {
         result = new XMLSerializeExpr();
         result.setExpression(expression);

src/test/java/net/sf/jsqlparser/statement/select/SelectXMLSerializeTest.java

@@ -18,21 +18,22 @@
  * @author tobens
  */
 public class SelectXMLSerializeTest {
+
     @Test
     public void testXmlAgg1() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("SELECT xmlserialize(xmlagg(xmltext(COMMENT_LINE) ORDER BY COMMENT_SEQUENCE) AS varchar (1024)) FROM mytable GROUP BY COMMENT_NUMBER");
     }
-    
+
     @Test
     public void testXmlAgg2() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("SELECT xmlserialize(xmlagg(xmltext(COMMENT_LINE) ORDER BY COMMENT_SEQUENCE, COMMENT_LINE) AS varchar (1024)) FROM mytable GROUP BY COMMENT_NUMBER");
     }
-    
+
     @Test
     public void testXmlAgg3() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("SELECT xmlserialize(xmlagg(xmltext(COMMENT_LINE) ORDER BY COMMENT_SEQUENCE) AS varchar (1024))");
     }
-    
+
     @Test
     public void testXmlAgg4() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("SELECT xmlserialize(xmlagg(xmltext(COMMENT_LINE_PREFIX || COMMENT_LINE) ORDER BY COMMENT_SEQUENCE) AS varchar (1024))");
@@ -42,4 +43,9 @@ public void testXmlAgg4() throws JSQLParserException {
     public void testXmlAgg5() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("SELECT xmlserialize(xmlagg(xmltext(CONCAT(', ', TRIM(SOME_COLUMN))) ORDER BY MY_SEQUENCE) AS varchar (1024))");
     }
+
+    @Test
+    public void testXmlAgg6() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("SELECT xmlserialize(xmlagg(xmltext(COMMENT_LINE)) AS varchar (1024))");
+    }
 }