I have a requirement to parse an xml and generate columns based on parameters
specified by the user to the pig script.
For eg, consider the following xml
<school>
<students>
<student>
<name>test</test>
<rno>1</rno>
<rank>3</rank>
</student>
<student>
<name>xyz</test>
<rno>3</rno>
<rank>2</rank>
</student>
<students>
</school>
My requirement is to parse the xml and generate the attributes depending on the
field names specified by the user.
For eg, if the user specifies the field name as 'name|rno' , the parser should
parse the xml and return a tuple containing name and rno.
I am using XML Loader to parse the xml up to student and then have written a
java UDF to parse the student xml.
I tried to define a parameterized constructor in my java UDF class wherein I
pass the columns/ attributes to be parsed.
I have then overridden the outputSchema(Schema input) method , in which I fetch
the column names and add new field schema.
However this does not work the way expected. Is there any way of getting this
done?
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