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From "Prasanth J (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-6382) PATCHED_BLOB encoding in ORC will corrupt data in some cases
Date Thu, 20 Feb 2014 00:30:19 GMT

     [ https://issues.apache.org/jira/browse/HIVE-6382?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth J updated HIVE-6382:
-----------------------------

    Attachment: HIVE-6382.5.patch

Gotcha! Fixed it in this patch.

> PATCHED_BLOB encoding in ORC will corrupt data in some cases
> ------------------------------------------------------------
>
>                 Key: HIVE-6382
>                 URL: https://issues.apache.org/jira/browse/HIVE-6382
>             Project: Hive
>          Issue Type: Bug
>          Components: Serializers/Deserializers
>    Affects Versions: 0.13.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>              Labels: orcfile
>         Attachments: HIVE-6382.1.patch, HIVE-6382.2.patch, HIVE-6382.3.patch, HIVE-6382.4.patch,
HIVE-6382.5.patch
>
>
> In PATCHED_BLOB encoding (added in HIVE-4123), gapVsPatchList is an array of long that
stores gap (g) between the values that are patched and the patch value (p). The maximum distance
of gap can be 511 that require 8 bits to encode. And patch values can take more than 56 bits.
When patch values take more than 56 bits, p + g will become > 64 bits which cannot be packed
to a long. This will result in data corruption under the case where patch values are >
56 bits. 



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