ResultMapper
Entry point of the read conversion chain: hands a decoded value to the converters and checks the result.
One of these belongs to each execution, over the TypeCatalog that execution pinned and whatever converters the query registered for itself. It is what Row.get and the fetchObject* family call, and a Row holds on to the one its execution ran under - so a row read long after the query finished still resolves against the catalog the query ran against.
Parameters
The pinned catalog to resolve converters, dictionaries and registrations against.
Converters registered on the query itself, in registration order, or null where it registered none. Consulted ahead of the catalog's.
The lookup handed to converters, reading the same pinned catalog.
Functions
Converts a decoded database value to expectedType.