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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11288) Avro SerDe InstanceCache returns incorrect schema
Date Tue, 28 Jul 2015 01:04:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643709#comment-14643709
] 

Xuefu Zhang commented on HIVE-11288:
------------------------------------

I think your patch doesn't seem right. For instance, I see changes for the same file in two
different places. In the patch, we just need a single diff for each file.

> Avro SerDe InstanceCache returns incorrect schema
> -------------------------------------------------
>
>                 Key: HIVE-11288
>                 URL: https://issues.apache.org/jira/browse/HIVE-11288
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Greg Phillips
>            Assignee: Greg Phillips
>         Attachments: HIVE-11288.2.patch, HIVE-11288.3.patch, HIVE-11288.patch
>
>
> To reproduce this error, take two fields in an avro schema document matching the following:
> "type" :  { "type": "array", "items": [ "null",  { "type": "map", "values": [ "null",
"string" ] } ]  }
> "type" : { "type": "map", "values": [ "null" , { "type": "array", "items": [ "null" ,
"string"] } ] }
> After creating two tables in hive with these schemas, the describe statement on each
of them will only return the schema for the first one loaded.  This is due to a hashCode()
collision in the InstanceCache.  
> A patch will be included in this ticket shortly which removes the hashCode call from
the InstanceCache's internal HashMap, and instead provides the entire schema object.



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