Query compiler and identified optimization

I completed creating the query object tree and interface declarations. Implementation was reviewed by my mentor and made few corrections in it. Then, I moved to a identified optimization part of the algebra. For a example say we have a condition,
class.property operation value,
so if there is an index available for the class.property we can use that for the fast searching. Identified the method need to be added to the class and introduced a index for attributes(property). They still gave me some errors, need to correct them tomorrow, hopefully. :)