[jira] [Resolved] (PIG-3619) Provide XPath function

["Alan Gates (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Gates resolved PIG-3619.
-----------------------------

    Resolution: Fixed

Patch checked in.  Thanks Saad.

> 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
>         Attachments: xpath.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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