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https://issues.apache.org/jira/browse/HIVE-7653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14116259#comment-14116259
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Sachin Goyal commented on HIVE-7653:
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[~davidzchen], [~sushanth] I see you have good experience with AvroSerDe as per
your contribution to HIVE-4329
[~swarnim], [~xuefuz], I see that you guys have also contributed a good deal on
HIVE-6147 and have also faced a problem similar to the one I am facing.
Could you please review this patch as well?
This is my first patch to HIVE and no one has responded to my review request
till now.
So I am trying to directly request some experienced folks.
Your review and comments will be much appreciated.
> Hive AvroSerDe does not support circular references in Schema
> -------------------------------------------------------------
>
> Key: HIVE-7653
> URL: https://issues.apache.org/jira/browse/HIVE-7653
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.13.1
> Reporter: Sachin Goyal
> Assignee: Sachin Goyal
> Attachments: HIVE-7653.1.patch, HIVE-7653.2.patch, HIVE-7653.3.patch
>
>
> Avro allows nullable circular references but Hive AvroSerDe does not.
> Example of circular references (passing in Avro but failing in AvroSerDe):
> {code}
> class AvroCycleParent {
> AvroCycleChild child;
> public AvroCycleChild getChild () {return child;}
> public void setChild (AvroCycleChild child) {this.child = child;}
> }
> class AvroCycleChild {
> AvroCycleParent parent;
> public AvroCycleParent getParent () {return parent;}
> public void setParent (AvroCycleParent parent) {this.parent = parent;}
> }
> {code}
> Due to this discrepancy, Hive is unable to read Avro records having
> circular-references. For some third-party code with such references, it
> becomes very hard to directly serialize it with Avro and use in Hive.
> I have a patch for this with a unit-test and I will submit it shortly.
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