xml bianry optimize && fix query bug

unittest/share/test_xml_parser.cpp

@@ -2685,6 +2685,7 @@ TEST_F(TestXmlParser, test_xml_bin_to_binary)
   ObXmlParser parser(ctx);
   ASSERT_EQ(OB_SUCCESS, parser.parse_document(xml_text));
   ASSERT_NE(nullptr, (doc = parser.document()));
+  doc->set_xml_type(M_CONTENT);
 
   ObString bin;
   ObString text;

unittest/share/test_xml_tree_base.cpp

@@ -103,6 +103,10 @@ public:
     return 0;
   }
 
+  bool is_equal_node(ObIMulModeBase* other) {
+    return false;
+  }
+
   int get_value(ObString& value, int64_t index = -1)  override
   {
     INIT_SUCC(ret);