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From "Daniel Weeks (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7800) Parqet Column Index Access Schema Size Checking
Date Sat, 23 Aug 2014 23:44:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108198#comment-14108198
] 

Daniel Weeks commented on HIVE-7800:
------------------------------------

The previous implementation had an issue that is only triggered in rare cases where the first
split of a task does not contain a row group.  This forces the initialization of the value
of the input format to be the size of the table (ArrayWritable), but the next row group will
produce a value only as wide the columns available in the file.

The new patch pads the resolved schema to ensure a matching size and masks the name of the
column so there no possibility of conflict with named columns within the file.

> Parqet Column Index Access Schema Size Checking
> -----------------------------------------------
>
>                 Key: HIVE-7800
>                 URL: https://issues.apache.org/jira/browse/HIVE-7800
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.14.0
>            Reporter: Daniel Weeks
>            Assignee: Daniel Weeks
>         Attachments: HIVE-7800.1.patch, HIVE-7800.2.patch
>
>
> In the case that a parquet formatted table has partitions where the files have different
size schema, using column index access can result in an index out of bounds exception.



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