hmit opened a new pull request, #3354:
URL: https://github.com/apache/avro/pull/3354

   ## What is the purpose of the change
   
   This pull request improves deserialization of data when using default 
`SpecificData` instance.
   
   Why?
   Often times, `SpecificDatumReader` and `ReflectDatumReader` are configured 
using the default `SpecificData` instance. This leads to deserialization error 
when reading fields with union type and inner logical type (see test-case).
   
   Deserialization works correctly when using the custom `SpecificData` 
instance stored in the `MODEL$` field of the schema class that `extends 
SpecificRecord`. The custom `SpecificData` has the necessary conversions stored 
to handle fields with union and logical types. The issue has been reported 
multiple times, notably in [AVRO-3989](linked JIRA).
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   - *The added test passes when the code is present but fails when the code is 
removed*
   
   
   ## Documentation
   
   - Does this pull request introduce a new feature? (no)


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