[jira] [Updated] (HIVE-5623) ORC accessing array column that's empty will fail with java out of bound exception

["Prasanth Jayachandran (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-5623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Prasanth Jayachandran updated HIVE-5623:
----------------------------------------
    Attachment: HIVE-5623.patch

> ORC accessing array column that's empty will fail with java out of bound exception
> ----------------------------------------------------------------------------------
>
>                 Key: HIVE-5623
>                 URL: https://issues.apache.org/jira/browse/HIVE-5623
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>    Affects Versions: 0.11.0
>            Reporter: Eric Chu
>            Priority: Critical
>              Labels: orcfile
>         Attachments: HIVE-5623.patch
>
>
> In our ORC tests we saw that queries that work on RCFile failed on the corresponding ORC version with Java IndexOutOfBoundsException in OrcStruct.java. The queries failed b/c the table has an array type column and there are rows with an empty array.  We noticed that the getList(Object list, int i) method in OrcStruct.java simply returns the i-th element from list without checking if list is not null or if i is within valid range. After fixing that the queries run fine. The fix is really simple, but maybe there are other similar cases that need to be handled.
> The fix is to check if listObj is null and if i falls within range:
>     public Object getListElement(Object listObj, int i) {
>       if (listObj == null) {
>           return null;
>       }
>       List list = ((List) listObj);
>       if (i < 0 || i >= list.size()) {
>           return null;
>       }
>       return list.get(i);
>     }



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