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https://issues.apache.org/jira/browse/PIG-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Giuseppe Santoro updated PIG-3619:
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Attachment: xpath2.patch
> Provide XPath function
> ----------------------
>
> Key: PIG-3619
> URL: https://issues.apache.org/jira/browse/PIG-3619
> Project: Pig
> Issue Type: Improvement
> Components: piggybank
> Reporter: Saad Patel
> Assignee: Saad Patel
> Fix For: 0.13.0
>
> Attachments: xpath.patch, xpath2.patch
>
>
> Xml is often loaded using XMLLoader with a record boundary tag as one of the
> parameters. A common use case is to then extract data from those records.
> XPath would allow those extractions to be done very easily. I'm proposing a
> patch that adds simple XPath support as a UDF.
> Example usage of this the XPath UDF would be:
> {code}
> extractions = FOREACH xmlrecords GENERATE XPath(record, 'book/author'),
> XPath(record, 'book/title');
> {code}
> The proposed UDF also caches the last xml document. This is helpful for
> improving performance when multiple consecutive xpath extractions on the same
> xml document, such as the example above.
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