casting numeric type to chararray during schema merge for union is inconsistent
with other schema merge cases
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Key: PIG-2071
URL: https://issues.apache.org/jira/browse/PIG-2071
Project: Pig
Issue Type: Bug
Reporter: Thejas M Nair
Assignee: Thejas M Nair
In PIG-1536, if a column in output of union has a source column one input of
type charraray and in other it is of a numeric type, the column of numeric type
will be cast to chararray. But in all other cases, chararray and numeric types
are considered incompatible, and as a result such implicit casting is not done.
To be consistent with other cases, union also should consider chararray and
numeric types to be incompatible.
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