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https://issues.apache.org/jira/browse/HIVE-1027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12845366#action_12845366
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Patrick Angeles commented on HIVE-1027:
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Here it is. I created a 'master' UDF guide page that is linked to via a list
item in the 'Hive Users Guide':
http://wiki.apache.org/hadoop/Hive/HiveUDFGuide
Side note: the wiki site is painfully slow :(
> Create UDFs for XPath expression evaluation
> -------------------------------------------
>
> Key: HIVE-1027
> URL: https://issues.apache.org/jira/browse/HIVE-1027
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Patrick Angeles
> Assignee: Patrick Angeles
> Priority: Minor
> Fix For: 0.6.0
>
> Attachments: hive-1027-v2.patch, hive-1027-v3.patch, hive-1027.patch,
> HIVE-1027_3.patch, udf_xpath.patch
>
>
> Create UDFs for evaluating XPath expressions against XML documents.
> Examples:
> > SELECT xpath_double ('<a><b class="odd">1</b><b class="even">2</b><b
> > class="odd">4</b><c>8</c></a>', 'sum(a/b...@class="odd"])') FROM src LIMIT
> > 1 ;
> 5.0
> > SELECT xpath_string ('<a><b>b1</b><b>b2</b></a>', 'a/b[2]') FROM src LIMIT
> > 1 ;
> b2
> > SELECT xpath ('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>',
> > 'a/c/text()') FROM src LIMIT 1 ;
> ["c1","c2"]
> Included functions are: xpath_short, xpath_int, xpath_long, xpath_float,
> xpath_double/xpath_number, xpath_string, xpath
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