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From "Jeremy Kahn (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-1265) Python: schema objects should support builder() default-filling behavior
Date Sat, 30 Mar 2013 16:23:14 GMT

     [ https://issues.apache.org/jira/browse/AVRO-1265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jeremy Kahn updated AVRO-1265:

    Status: Patch Available  (was: In Progress)

Patches on top of AVRO-1284 provide {{schema.build_defaults(datum)}} behavior that expands
{{datum}} to include default values if they are available.

Useful for systematically producing valid data for (e.g.) IPC protocols.
> Python: schema objects should support builder() default-filling behavior
> ------------------------------------------------------------------------
>                 Key: AVRO-1265
>                 URL: https://issues.apache.org/jira/browse/AVRO-1265
>             Project: Avro
>          Issue Type: Improvement
>          Components: python
>            Reporter: Jeremy Kahn
>            Assignee: Jeremy Kahn
>            Priority: Minor
>              Labels: features
>             Fix For: 1.7.5
>         Attachments: avro-1265a-build-defaults.patch, avro-1265b-tests.patch
> There seems to be no way to easily use the avro libraries in Python (where I feel most
qualified to comment) to encode generics with "missing default values" and have them transmitted
in well-formed avro binary.
> If you fill in the "missing" default values, the Python libraries will transmit correctly.
> I'd be happy to add methods to the avro.RecordSchema objects (in the Python libraries)
that "fill defaults" on missing member fields of a record, recursively (which probably means
method extension of other schema classes as well).
> For backwards compatibility (and probably to avoid unnecessary data traversal), clients
probably want to explicitly ask the schema to fill in defaults before transmission in the
cases where you'd like to set only the non-default values.

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