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https://issues.apache.org/jira/browse/PIG-4938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15364262#comment-15364262
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Nandor Kollar commented on PIG-4938:
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Hi Daniel,
Attached the patch, and created a review on review board too:
https://reviews.apache.org/r/49704
The patch addresses PIG-4752 too.
> [PiggyBank] XPath returns empty values when using aggregation method
> --------------------------------------------------------------------
>
> Key: PIG-4938
> URL: https://issues.apache.org/jira/browse/PIG-4938
> Project: Pig
> Issue Type: Bug
> Components: piggybank
> Affects Versions: 0.15.0
> Reporter: Ivo Lenting
> Assignee: Nandor Kollar
> Priority: Minor
> Attachments: PIG-4938.patch
>
>
> I have a xml file which I want to parse using the piggybank XPath udf.
> The xml is:
> <Aa name="test1">
> <Bb Cc="1"/>
> <Bb Cc="1"/>
> <Bb Cc="1"/>
> <Bb Cc="1"/>
> <Dd>test2</Dd>
> </Aa>
> The xpath contains a sum aggregate to sum all Cc values.
> The complete pig script:
> REGISTER piggybank.jar
> DEFINE XPath org.apache.pig.piggybank.evaluation.xml.XPath();
> DEFINE XPathAll org.apache.pig.piggybank.evaluation.xml.XPathAll();
> XMLFile = LOAD '/demo/test.xml' using
> org.apache.pig.piggybank.storage.XMLLoader('Aa') as (xmlContents:chararray);
> MyOutput = FOREACH XMLFile GENERATE
> XPathAll(xmlContents,'Aa/@name',true,false).$0 AS
> Aa:chararray,XPath(xmlContents,'sum(Aa/Bb/@Cc)') AS Cc:Double,
> XPath(xmlContents,'Aa/Dd') AS Dd:chararray;
> STORE MyOutput INTO 'Output/MyOutput' USING PigStorage('|');
> MyOutput:
> test1||test2
> So i'm missing the aggregate 4 in column 2.
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