Enhance schema parser to allow arbitrary properties to be defined on a record
field
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Key: AVRO-601
URL: https://issues.apache.org/jira/browse/AVRO-601
Project: Avro
Issue Type: Improvement
Components: java, spec
Environment: All
Reporter: David Rosenstrauch
Priority: Minor
It's currently not possible to add an arbitrary property on a record field.
e.g., in the following example, although the schema parses fine, the "alias"
property gets thrown away:
{
"name": "KVPair",
"type": "record",
"fields" : [
{"name": "key", "type": "int", "alias": "EventTime"},
{"name": "values", "type": "bytes"}
]
}
I had read the Avro spec and thought this was actually allowed ("Attributes not
defined in this document are permitted as metadata, but must not affect the
format of serialized data.") but it appears that such additional properties are
only allowed at the schema level, not at the field level too.
This would be a really useful feature to have, as it would allow the user to
define meta-data on a field. Currently the only other way to achieve the same
behavior would be to do some kind of hack using the field's "doc" attribute,
which would be rather ugly.
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