Any documents or API of DRILL?

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Hi, I'm a new drill user from china. With you guys' help, I have get my drill 
prepared for JDBC calling on Linux shell. Now I want to develop some simple 
applications on my eclipse, but I couldn't find any instances to refer to. I 
want some guidance of how to develop a drill related application on eclipse. I 
would appreciate it if any documents or API are provided.
I'm looking forward your reply.