DefaultTableFactory - utility class creating internal tables

Internal tables that this class will create:
* metadata
* statisics

So far it only creates a stub for metadata. Trying to create statistics
table causes an exception.
Parameterless c-tor so we can create a temporary QueryResult obj

Parameterless c-tor so we can create a temporary QueryResult object and
specify it later. Useful in parsing SQL statements but clearly a sugar.
Attempt to implement select, just a mockup...

It's doing only one usefull things parses simplest possible select
clause.