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https://issues.apache.org/jira/browse/AVRO-1289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Kulp updated AVRO-1289:
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Fix Version/s: (was: 1.9.0)
> Python: Schema objects should polymorphically interact with data-walker
> interface
> ---------------------------------------------------------------------------------
>
> Key: AVRO-1289
> URL: https://issues.apache.org/jira/browse/AVRO-1289
> Project: Apache Avro
> Issue Type: Improvement
> Components: python
> Affects Versions: 1.7.5
> Reporter: Jeremy Kahn
> Assignee: Jeremy Kahn
> Priority: Minor
> Labels: features
>
> Python {{avro.schema}} objects should be able to call back to a general
> data-and-schema parallel-walker ("validate" would be one of those, but so
> could be "default-filler").
> There should be an {{avro.walker}} interface that owns the parallel state (a
> datum-reader/deserializer, a datum-writer/serializer, a validator, or a
> default-filler -- see AVRO-1265). Schema polymorphism would allow us to
> eliminate the large (and highly redundant) function-dispatch methods in
> {{avro.io}} by making the {{avro.schema.Schema}} subclass responsible for
> calling back to the {{avro.walker}} object.
> Assigning this to v1.8.0 because it may be difficult to duplicate *every*
> behavior of 1.7.* with the same function signatures, especially where this
> refactor may be eliminate entire classes.
> This factoring ought to make it easier to improve or extend objects that meet
> this {{walker}} interface -- validators & serializers might be able to store
> more state about their position within a record, for example, to yield more
> informative error messages upon mismatch (as requested by Jonathan Coveney on
> the user mailing list).
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