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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (PIG-902) Allow schema matching for UDF with variable length arguments
Date Mon, 13 Sep 2010 22:36:35 GMT

     [ https://issues.apache.org/jira/browse/PIG-902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alan Gates reassigned PIG-902:
------------------------------

    Assignee: Daniel Dai

> 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
>            Assignee: 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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