使用CursorLoader来获取电子邮件会导致电子邮件的重复

I am trying to get email ids of uses contacts. For that I am using Cursor Loader. There is one problem I am getting duplicate email ids also. How to remove email duplicacy. Should I use raw query "SELECT DISTINCT" instead of using CursorLoader or there is some other solution?I am trying to get email ids of uses contacts.