[
https://issues.apache.org/jira/browse/PIG-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Giuseppe Santoro updated PIG-3619:
----------------------------------
Attachment: xpath2.patch
I have tried to use this UDF but I get some exceptions related to the Function
Mapping definition. You define here just one parameter while there are at least
two mandatory parameters and one optional. I have fixed that issue in my new
patch xpath2.patch you can find attached to this ticket. I have been running
this UDF with hundreds of XPath queries and it works really well even with the
optional parameter.
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
