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https://issues.apache.org/jira/browse/AVRO-313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thiruvalluvan M. G. updated AVRO-313:
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Status: Patch Available (was: Open)
> Default values for fields or records and array (or map) don't work with
> ResolvingDecoder
> ----------------------------------------------------------------------------------------
>
> Key: AVRO-313
> URL: https://issues.apache.org/jira/browse/AVRO-313
> Project: Avro
> Issue Type: Bug
> Components: java
> Reporter: Thiruvalluvan M. G.
> Assignee: Thiruvalluvan M. G.
> Attachments: AVRO-313-test.patch, AVRO-313.patch
>
>
> If the writer's and reader's schema are different and reader's schema defines
> a field with a default while the writer's does not have that field, the
> ResolovingDecoder returns the default value for the field to the reader. This
> is accomplished by replacing the actual InputStream with the one that has the
> default value. Remember the actual input stream didn't have a value for the
> field. Now the original input stream is restored by an implicit action called
> DEFAULT_END_ACTION. If the record is the last in a slice of an array(or a
> map), the code used to see (after consuming the record) if there are any more
> entries in the array(map). This check should happen on the original input
> stream. Since the input stream has not been restored, the check happens on
> the default-value input stream causing error.
> The following patch solves this by consuming all "trailing" implicit actions
> before looking for further entries in the array(map). There was already a
> method Parser.processImplicitActions() which consumed _all_ implicit actions.
> It turns out one needs to consume only the trailing implicit action. So I
> renamed the method to processTrailingImplicitActions and changed the code to
> meet the new specification.
> I also added a couple of tests that catch the problem.
> First apply the patch for the tests, you'd see the problem. Then apply the
> fix and see that the problem go away.
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