allow for mutual recursion in type definitions
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Key: AVRO-530
URL: https://issues.apache.org/jira/browse/AVRO-530
Project: Avro
Issue Type: Improvement
Components: spec
Affects Versions: 1.3.2
Reporter: Jeff Hodges
Suppose you have these two types in your protocol:
{code}
{"name": "User", "type": "record", "fields": [{"name": "current_status",
"type": "Status"}]}
{"name": "Status", "type": "record", "fields": [{"name": "author", "type":
"User"}]}
{code}
This will raise an error! The current workaround is to define one of them at
their first usage. Like:
{code}
{"name": "User", "type": "record", "fields": [{"name": "current_status",
"type": {"name": "Status", "type": "record", "fields": [.. lots of fields
...]}]}
{code}
But this is incredibly unwieldy. It would be really nice for the spec to
require all the parsers to allow for mutual recursion, instead. It could be
done by implementing a two-pass parser. One pass to acquire names referenced,
and a second to fill in those names with their appropriate references.
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