I have searchform, 

where one can define various fields and mapping to expressions for 
comparison, 
and it automatically constructs select query, 

but if I want to check if expression is aggregate, and direct thesese 
queries to "having"

but if I try 

if filter.target_expression.op == db._adapter.AGGREGATE:

I get 

AttributeError: 'SQLite' object has no attribute 'AGGREGATE'




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