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From "Patrick Angeles (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1027) Create UDFs for XPath expression evaluation
Date Tue, 05 Jan 2010 05:16:55 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796527#action_12796527
] 

Patrick Angeles commented on HIVE-1027:
---------------------------------------

Code uses the built-in javax.xml.xpath library.

> 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
>            Priority: Minor
>         Attachments: 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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