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https://issues.apache.org/jira/browse/PIG-427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shravan Matthur Narayanamurthy updated PIG-427:
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Attachment: 427-2.patch
Have addressed olga's comments. There was a bug in 427-1.patch. I think I have
resolved it now. It made the implicit assumption that if byte array is found
and we have a single func defined, then the matching func is the defined one.
However, this need not be the case. So need to check if a fit is possible. For
ex, we might have (bytearray, int) & func defined might have (long, tuple). In
this case, we need to fail.
Also, hopefully the code is more readable now.
> casting parameters of a UDF
> ---------------------------
>
> Key: PIG-427
> URL: https://issues.apache.org/jira/browse/PIG-427
> Project: Pig
> Issue Type: Improvement
> Affects Versions: types_branch
> Reporter: Olga Natkovich
> Assignee: Shravan Matthur Narayanamurthy
> Fix For: types_branch
>
> Attachments: 427-1.patch, 427-2.patch, 427.patch
>
>
> 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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