[jira] Resolved: (HIVE-235) DynamicSerDe does not work with Thrift Protocols that can have missing fields for null values

["Zheng Shao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zheng Shao resolved HIVE-235.
-----------------------------

      Resolution: Fixed
    Release Note: 
HIVE-235. Fixed DynamicSerDe to work with null values with Thrift Protocols that can have missing fields for null values. (zshao)

    Hadoop Flags: [Reviewed]

Committed revision 736092.

> DynamicSerDe does not work with Thrift Protocols that can have missing fields for null values
> ---------------------------------------------------------------------------------------------
>
>                 Key: HIVE-235
>                 URL: https://issues.apache.org/jira/browse/HIVE-235
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Serializers/Deserializers
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>            Priority: Blocker
>         Attachments: HIVE-235.1.patch, HIVE-235.2.patch
>
>
> The current DynamicSerDe code assumes all fields are there and no fields are missing.
> However Thrift Protocols can have missing fields, in case the field is null.
> In that case, DynamicSerDe may commit 2 behavior:
> 1. array index out of bound error because DynamicSerDe assumes the number of fields in the record should be equal to that in the DDL;
> 2. fields with null values will take the value from the last record. This may produce wrong result for queries.
> In order to fix this, we need to:
> 1. Pass ObjectInspector/TypeInfo recursively so that we know the number of fields when deserializing the record.
> 2. Clear out fields that are missing from the record.

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