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https://issues.apache.org/jira/browse/AVRO-3028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269307#comment-17269307
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Ryan Skraba commented on AVRO-3028:
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I agree: we answer this question all the time: {{"default"}} is used during
schema evolution, to provide a value when a new field appears in the schema,
and it is not related to encoding and decoding.
(It doesn't help that GenericRecordBuilder _also_ uses it for convenience when
the user omits setting a value in the Java world!)
> Clarify that records encode values even if they equal their default
> -------------------------------------------------------------------
>
> Key: AVRO-3028
> URL: https://issues.apache.org/jira/browse/AVRO-3028
> Project: Apache Avro
> Issue Type: Improvement
> Components: spec
> Affects Versions: 1.10.0, 1.10.1
> Reporter: Juan Cruz Viotti
> Priority: Trivial
>
> I believe that this is an important aspect to clarify as some other
> serialization formats omit fields that equal their default for
> space-efficiency reasons. I had to run a small experiment as I could not
> find this information in the spec.
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