function done( error, results, info ) {
			error = error || null;
			results = results || null;
			info = info || null;
			clbk( error, results, info );
		}
Callback invoked after query completion.

@private
@param {(Error|null)} error - error object
@param {Object} results - query results
@param {Object} info - response info
@returns {void}