One very basic question - When i use the query builder API of CQ, does it used Lucene search internally? I mean are the queries converted to Lucene queries and then the results are fetched?
If not, what of Lucene does the CQ querybuilder use?
Yes. QueryBuilder queries are translated into JCR XPath queries which are then executed using Lucene (plus layers on top of Lucene to handle things like access control and node hiearchy).
Thanks that clarifies my question.