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https://issues.apache.org/jira/browse/PIG-3293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13755073#comment-13755073
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Olga Natkovich commented on PIG-3293:
-------------------------------------
Would it help to document that typecasting needs to happen before any Union
operation?
> Casting fails after Union from two data sources&loaders
> -------------------------------------------------------
>
> Key: PIG-3293
> URL: https://issues.apache.org/jira/browse/PIG-3293
> Project: Pig
> Issue Type: Bug
> Reporter: Koji Noguchi
> Priority: Minor
> Attachments: pig-3293-test-only-v01.patch
>
>
> Script similar to
> {noformat}
> A = load 'data1' using MyLoader() as (a:bytearray);
> B = load 'data2' as (a:bytearray);
> C = union onschema A,B;
> D = foreach C generate (chararray)a;
> Store D into './out';
> {noformat}
> fails with
> java.lang.Exception: org.apache.pig.backend.executionengine.ExecException:
> ERROR 1075: Received a bytearray from the UDF. Cannot determine how to
> convert the bytearray to string.
> Both MyLoader and PigStorage use the default Utf8StorageConverter.
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