bsannicolas opened a new pull request, #29849:
URL: https://github.com/apache/beam/pull/29849

   https://github.com/apache/beam/issues/23373
   
   Possible (partial) implementation of logical types with arguments. 
Currently, only map and atomic values are supported.
   
   Adds an instance method _language_type() to LogicalType that returns the 
language type for a specific instance of a logical type, i.e. a logical type 
with a specific argument. For logical types without arguments, this should just 
return the existing language_type().
   
   Several downsides:
   - Types need to be hashable and in practice should define a hash function 
that is a combination of the class and the argument. This implies the argument 
needs to be hashable as well.
   - PassThroughLogicalTypes cannot have an argument, as it's impossible for 
the language type to match the representation type while also acting as a 
container for the argument that is excluded from the representation (by 
definition).
   
   I'm not sure if there's a better way to approach this? I can also remove the 
EnumerationType from schemas.py and use a test specific schema 
defined/registered in schemas_test.py.
   
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