Query Builder Basics

Query Builder is an API that can be used to create search queries in the JAVA content repository. It is an extensible tool by which you may add/remove various predicates in a query using this API.

The best way to create predicates is by using the Query Builder Debugging Tool: /libs/cq/search/content/querydebug.html .
Try to implement your Business use case in the Predicate form using this debugger, Optimize the query and then implement it in the code.