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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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Saad Patel updated PIG-3619:
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Description:
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.
was:
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}
> 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
> 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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