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https://issues.apache.org/jira/browse/PIG-5312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Travis Woodruff updated PIG-5312:
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Attachment: PIG-5312.patch
> Uids not set in inner schemas after UNION ON_SCHEMA
> ---------------------------------------------------
>
> Key: PIG-5312
> URL: https://issues.apache.org/jira/browse/PIG-5312
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.16.0, 0.17.0
> Reporter: Travis Woodruff
> Assignee: Travis Woodruff
> Priority: Normal
> Attachments: PIG-5312.patch
>
>
> Ran into a failure with a script of the form:
> {code}
> u = union on_schema x, y; -- schema: (a, b: {(m:int, n: chararray)})
> z = foreach u {
> i = foreach b generate m + 5;
> generate a, i;
> }
> {code}
> The issue ended up being that {{LOUnion}} is not setting uids on inner
> schemas. This means that uids on inner schema fields are all -1, so when
> {{ProjectExpression.getFieldSchema()}} tries to look up the fields in the
> inner select from the inner schema, all the fields match, and the last
> field's schema ends up being returned. In the example above this causes
> {{TypeCheckingExpVisitor.addCastsToNumericBinExpression()}} to fail for the
> addition operator (since the returned field schema is a chararray).
> This only seems to affect the schema, so I don't think this should cause bad
> data to be produced.
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