Travis Woodruff created PIG-5312:
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Summary: 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: 0.17.0, 0.16.0
Reporter: Travis Woodruff
Assignee: Travis Woodruff
Priority: Normal
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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