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https://issues.apache.org/jira/browse/AVRO-1270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650647#comment-13650647
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Zhenghua Chen commented on AVRO-1270:
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It seems that C++ implemenation has the same problem. This caused a big trouble
to the backward compatibility
> Emit default values from resolved reader during schema evolution/projection
> ---------------------------------------------------------------------------
>
> Key: AVRO-1270
> URL: https://issues.apache.org/jira/browse/AVRO-1270
> Project: Avro
> Issue Type: Bug
> Components: c
> Affects Versions: 1.7.4
> Environment: avro-c, schema evolution, return default values for
> fields not present in writer schema.
> Reporter: Chris Laws
> Priority: Minor
>
> Default values are not being returned by a resolved reader schema for fields
> that were not present in the writer schema.
> The code that demonstrates this issue can be found in this gist
> (https://gist.github.com/claws/5069264). It is a slightly modified version of
> an example by Douglas Creager.
> The section of interest is the READER_SCHEMA_C where a new field is added (to
> simulate schema evolution). In the main function the line:
> read_with_schema_resolution(FILENAME, READER_SCHEMA_C, "c");
> which is intended to display the default value for field 'c', as this field
> is not present in the writer schema. This does not happen. Instead an error
> is reported:
> Error: Reader field c doesn't appear in writer
> This error indicates that the avro-c implementation does not appear to
> support returning default values.
> While posting about my avro problems on the avro user mailing list Douglas
> Creager indicated that the avro-c implementation does not support this
> functionality and suggested that a JIRA issue be raised.
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