Chris Laws created AVRO-1270:
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Summary: Emit default values from reader schema 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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