[#1808] Optimise various ResultQuery.fetch(int),

ResultQuery.fetch(String) methods. They don't need to fetch all fields,
only the required ones - Added a comment

jOOQ/src/main/java/org/jooq/impl/AbstractSelect.java

@@ -133,6 +133,9 @@ abstract class AbstractSelect<R extends Record> extends AbstractResultQuery<R> i
 
     @Override
     protected final List<Field<?>> getFields(ResultSetMetaData meta) {
+
+        // [#1808] TODO: Restrict this field list, in case a restricting fetch()
+        // method was called to get here
     	List<Field<?>> select = getSelect();
 
     	// If no projection was specified explicitly, create fields from result