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https://issues.apache.org/jira/browse/PIG-2713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13289961#comment-13289961
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Daniel Dai commented on PIG-2713:
---------------------------------
Check this: http://pig.apache.org/docs/r0.10.0/basic.html#disambiguate
> Pig query planner throwing parse error on Joins
> ------------------------------------------------
>
> Key: PIG-2713
> URL: https://issues.apache.org/jira/browse/PIG-2713
> Project: Pig
> Issue Type: Bug
> Components: parser
> Affects Versions: 0.8.1, 0.9.2
> Environment: CentOS 6
> Reporter: Bejoy KS
>
> Pig parser is throwing an exception when two columns in a table has the same
> name and when they are used as part of some projection operation after join.
> Error message
> ERROR 1103: Merge join/Cogroup only supports Filter, Foreach, filter and Load
> as its predecessor. Found :
> Error would be thrown for common join as well.
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