Daniel Dai resolved HIVE-18789.
    Resolution: Won't Fix

The fix would not work if there's an xercesImpl.jar in classpath. 
xercesImpl.jar will override JDK's DocumentBuilderFactory implementation and 
does not understand ACCESS_EXTERNAL_DTD/ACCESS_EXTERNAL_SCHEMA attributes. 
Since xercesImpl.jar is part of Hadoop 2 distribution, we need to find an 
alternative fix. Revert the fix and open HIVE-18879 to redo the fix.

> Disallow embedded element in UDFXPathUtil
> -----------------------------------------
>                 Key: HIVE-18789
>                 URL: https://issues.apache.org/jira/browse/HIVE-18789
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>            Priority: Major
>             Fix For: 3.0.0
>         Attachments: HIVE-18789.1.patch, HIVE-18789.2-branch-2.3.patch, 
> HIVE-18789.2.patch

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