casting parameters of a UDF
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Key: PIG-427
URL: https://issues.apache.org/jira/browse/PIG-427
Project: Pig
Issue Type: Improvement
Affects Versions: types_branch
Reporter: Olga Natkovich
Fix For: types_branch
Currently if we have a UDF that declares via getArgToFuncMapping that it can
only handle a subset of types, passing any other types to the function would
result in an error. However, some types can be promoted to others and it would
be useful if typechecker to perform best fit cast. For instance, if the input
parameter has type of Long and the UDF support Int and Double, the code should
cast the paraneter into Double.
This would be very useful for conversion of the UDFs from the piigybank to the
new code.
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