support xmltype

Author: sjjian

ast/element/datatype.go

@@ -45,6 +45,7 @@ const (
 	DataDefSmallInt
 	DataDefDoublePrecision
 	DataDefReal
+	DataDefXMLType
 )
 
 type datatype struct {
@@ -167,4 +168,8 @@ type NClob struct {
 
 type BFile struct {
 	datatype
+}
+
+type XMLType struct {
+	datatype
 }

lexer.go

@@ -307,6 +307,7 @@ var unReservedKeyword = map[string]int{
 	"varying":                 _varying,
 	"visible":                 _visible,
 	"write":                   _write,
+	"xmltype":                 _XMLType,
 	"year":                    _year,
 	"zone":                    _zone,
 }