[jira] Commented: (PIG-1318) [Zebra] Invalid type for source_table field when using order-preserving Sorted Table Union

["Yan Zhou (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-1318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12848849#action_12848849 ] 

Yan Zhou commented on PIG-1318:
-------------------------------

+1

> [Zebra] Invalid type for source_table field when using order-preserving Sorted Table Union
> ------------------------------------------------------------------------------------------
>
>                 Key: PIG-1318
>                 URL: https://issues.apache.org/jira/browse/PIG-1318
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Gaurav Jain
>             Fix For: 0.7.0
>
>         Attachments: PIG-1318.patch
>
>
> When we are trying to use order-preserving sorted union:
> ....
> We got the following schema, where the type of 'source_table' is (null) with no column name:
> {id: chararray,name: chararray,context: chararray,writer: chararray,rev: chararray,schema: chararray,(null)}
> I tried to project the 'source_table' field but failed:
> B = FOREACH A GENERATE id, $6; 
> DUMP B;
> But then we got exception org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias B.
> Can you guys please let us know how to access this column? Or is the symptom described above is a bug?

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