Create UDFs for XPath expression evaluation
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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
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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