[jira] [Created] (AVRO-3833) Spec: clarify uniqueness of names and aliases

["Oscar Westra van Holthe - Kind (Jira)" <ji...@apache.org>]

Oscar Westra van Holthe - Kind created AVRO-3833:
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             Summary: Spec: clarify uniqueness of names and aliases
                 Key: AVRO-3833
                 URL: https://issues.apache.org/jira/browse/AVRO-3833
             Project: Apache Avro
          Issue Type: Improvement
          Components: spec
    Affects Versions: 1.11.2
            Reporter: Oscar Westra van Holthe - Kind


The specification currently says nothing about the uniqueness of names. At most it says something about equality of names, assuming readers understand that a name must uniquely identify a type. 

I suggest making the rules for uniqueness explicit. 

This would mean:
# Full names and aliases of types (including namespace) must be unique
# For each enum type, symbol names must be unique
# For each record/error type, field names and aliases must be unique

Also, I propose to add that aliases should be, but to not need be, valid names. Using an invalid name as alias allows schema evolution to correct illegal names used in the past.



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