fxi: sql 拼接

backend/src/main/resources/sql/sqlTemplate.stg

@@ -31,9 +31,12 @@ ORDER BY
 >>
 
 
-previewSql(groups, aggregators, filters, orders, table, isGroup)
+previewSql(limitFiled, groups, aggregators, filters, orders, table, isGroup)
 ::=<<
 SELECT
+<if(limitFiled)>
+   <limitFiled.limitFiled>
+<endif>
 <if(!groups && !aggregators)>
     *
 <endif>