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https://issues.apache.org/jira/browse/PIG-2063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032522#comment-13032522
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Xuefu Zhang commented on PIG-2063:
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The same problem occurs for cases where a column is a bag or tuple with
different columns. Refer to
TestUnionOnSchema.testUnionOnSchemaIncompatibleTypes() for examples.
> Regression: an invalid query regarding union onschema becoming valid
> --------------------------------------------------------------------
>
> Key: PIG-2063
> URL: https://issues.apache.org/jira/browse/PIG-2063
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Xuefu Zhang
> Assignee: Thejas M Nair
> Fix For: 0.9.0
>
>
> The following query fails in 0.8:
> A = load 'x' as (x:long, y:chararray);
> B = load 'y' as (x:long, y:float);
> C = union onschema A, B;
> grunt> C = union onschema A, B;
> 2011-05-12 09:01:47,031 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 1031: Incompatible types for merging schemas. Field schema: y: chararray
> Other field schema: y: float
> However, in 0.9 validation doesn't catch the error. It seems float is cast to
> chararray automatically.
> grunt> describe C;
> C: {x: long,y: chararray}
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