Modify nullable test

sharding-jdbc-core/src/test/resources/parser/select_in.xml

@@ -7,5 +7,8 @@
         <table-tokens>
             <table-token begin-position="14" original-literals="t_order" />
         </table-tokens>
+        <order-by-columns>
+            <order-by-column name="order_id" order-by-type="ASC" />
+        </order-by-columns>
     </assert>
 </asserts>

sharding-jdbc-core/src/test/resources/sql/dql/select_nullable.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <sqls>
-    <sql id="assertSelectInWithNullParameter" value="SELECT * FROM t_order WHERE sku_num IN (%s, %s)" type="MySQL,PostgreSQL,SQLServer,Oracle" />
+    <sql id="assertSelectInWithNullParameter" value="SELECT * FROM t_order WHERE sku_num IN (%s, %s) ORDER BY order_id ASC" type="MySQL,PostgreSQL,SQLServer,Oracle" />
 </sqls>
\ No newline at end of file