Oracle支持Sample Clause

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@149 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/visitor/OracleOutputVisitor.java

@@ -1468,8 +1468,9 @@ public class OracleOutputVisitor extends SQLASTOutputVisitor implements OracleAS
         print(")");
         
         if (x.getSeedValue() != null) {
-            print(" SEED ");
+            print(" SEED (");
             x.getSeedValue().accept(this);
+            print(")");
         }
        
         return false;