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https://issues.apache.org/jira/browse/PIG-1826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009232#comment-13009232
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Daniel Dai commented on PIG-1826:
---------------------------------
The error message can be improved. We can be more specific to say something
like "MutableInt is not supported. Only Pig data type is allowed".
> Unexpected data type -1 found in stream error
> ---------------------------------------------
>
> Key: PIG-1826
> URL: https://issues.apache.org/jira/browse/PIG-1826
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.8.0
> Environment: This is pig 0.8.0 on a linux box
> Reporter: Jonathan Coveney
> Attachments: PIG-1826.tar.gz, numgraph.java
>
>
> When running the attached udf I get the title error. By inserting printlns
> extensively, the script is functioning properly and returning a DataBag, but
> for whatever reason, pig does not detect it as such.
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