During IBM Think Luis presented the DQL Explorer which helps

• Business users have access to Domino data like never before.
• Developers to understand their queries before even opening the Designer
• Administrators to understand the impact on the Domino servers (if any)

Now the DQL Explorer is available on OpenNTF and you can download this great tool here: https://www.openntf.org/main.nsf/project.xsp?r=project/DQL%20Explorer