[jira] [Commented] (HIVE-6382) PATCHED_BLOB encoding in ORC will corrupt data in some cases

["Lefty Leverenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-6382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049710#comment-14049710 ] 

Lefty Leverenz commented on HIVE-6382:
--------------------------------------

*hive.exec.orc.skip.corrupt.data* is documented in the wiki:

* [Configuration Properties -- hive.exec.orc.skip.corrupt.data | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.exec.orc.skip.corrupt.data]

> 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
>             Fix For: 0.13.0
>
>         Attachments: HIVE-6382.1.patch, HIVE-6382.2.patch, HIVE-6382.3.patch, HIVE-6382.4.patch, HIVE-6382.5.patch, HIVE-6382.6.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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