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https://issues.apache.org/jira/browse/PIG-902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olga Natkovich updated PIG-902:
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Fix Version/s: 0.9.0
> Allow schema matching for UDF with variable length arguments
> ------------------------------------------------------------
>
> Key: PIG-902
> URL: https://issues.apache.org/jira/browse/PIG-902
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Affects Versions: 0.3.0
> Reporter: Daniel Dai
> Fix For: 0.9.0
>
>
> Pig pick the right version of UDF using a similarity measurement. This
> mechanism pick the UDF with right input schema to use. However, some UDFs use
> various number of inputs and currently there is no way to declare such input
> schema in UDF and similarity measurement do not match against variable number
> of inputs. We can still write variable inputs UDF, but we cannot rely on
> schema matching to pick the right UDF version and do the automatic data type
> conversion.
> Eg:
> If we have:
> Integer udf1(Integer, ......);
> Integer udf1(String, ......);
> Currently we cannot do this:
> a: {chararray, chararray}
> b = foreach a generate udf1(a.$0, a.$1); // Pig cannot pick the udf(String,
> ......) automatically, currently, this statement fails
> Eg:
> If we have:
> Integer udf2(Integer, ......);
> Currently, this script fail
> a: {chararray, chararray}
> b = foreach a generate udf1(a.$0, a.$1); // Currently, Pig cannot convert
> a.$0 into Integer automatically
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