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https://issues.apache.org/jira/browse/PIG-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763592#action_12763592
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Olga Natkovich commented on PIG-989:
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+1, looks good. Please, commit

> Allow type merge between numerical type and non-numerical type
> --------------------------------------------------------------
>
>                 Key: PIG-989
>                 URL: https://issues.apache.org/jira/browse/PIG-989
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.5.0
>            Reporter: Daniel Dai
>         Attachments: PIG-989-1.patch, PIG-989-2.patch
>
>
> Currently, we do not allow type merge between numerical type and 
> non-numerical type. And the error message is confusing. 
> Eg, if you run:
> a = load '1.txt' as (a0:chararray, a1:chararray);
> b = load '2.txt' as (b0:long, b1:chararray);
> c = join a by a0, b by b0;
> dump c;
> And the error message is "ERROR 1051: Cannot cast to Unknown"
> We shall:
> 1. Allow the type merge between numerical type and non-numerical type
> 2. Or at least, provide more meaningful error message to the user

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