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https://issues.apache.org/jira/browse/PIG-2705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279991#comment-13279991
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Daniel Dai commented on PIG-2705:
---------------------------------
org.apache.pig.impl.logicalLayer.schema.Schema, which we used in EvalFunc. This
is the data structure to expose to developer.
> outputSchema modification from scripting UDFs
> ---------------------------------------------
>
> Key: PIG-2705
> URL: https://issues.apache.org/jira/browse/PIG-2705
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.9.2, 0.10.0
> Reporter: Josh Levy
> Attachments: PIG-2705-1.patch, PIG-2705.2.patch
>
>
> The examples for @schemaFunction that I've seen on the web
> (http://pig.apache.org/docs/r0.10.0/udf.html#decorators) tend to be trivial
> ones that return the same schema passed in. I had a problem where I wrote a
> python udf that added a new field into a tuple in a bag. I ended up not
> specifying schema in python and then casting in pig. How does the community
> feel about making it easier to generate a dynamic schema from a scripting UDF?
> This could be done by modifying JythonFunction.outputSchema to handle
> outputSchemaFunc returning a string like @outputSchema does, or by exposing a
> public api that makes it easier to manipulate
> org.apache.pig.impl.logicalLayer.schema.Schema
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