When query with specific column loads properly and I can see 
'result_processor' and/or 'process_result_value' is invoked with correct 
value but when query directly on Model (no explicit column is specified but 
all columns are queried in this case by default) invokes those methods with 
None value. Is this known issue? are there any workaround? I tried both 
TypeDecorator approach and sub-type approach. 

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SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

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