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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-552) UDF defined with argument causes class instantiation exception
Date Wed, 03 Dec 2008 23:03:44 GMT

    [ https://issues.apache.org/jira/browse/PIG-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653034#action_12653034
] 

Olga Natkovich commented on PIG-552:
------------------------------------

Also Compare functions are mostly obsolete so we are unlikely to spend much time on them.

> UDF defined with argument causes class instantiation exception
> --------------------------------------------------------------
>
>                 Key: PIG-552
>                 URL: https://issues.apache.org/jira/browse/PIG-552
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: types_branch
>            Reporter: Christopher Olston
>         Attachments: pig.patch
>
>
> I'm doing:
> define myFunc myFunc('blah');
> b = foreach a generate myFunc(*);
> Pig parses it, but fails when it tries to run it on hadoop (I'm using "local" mode).
It tries to invoke the class loader on "myFunc('blah')" instead of on "myFunc", which causes
an exception.
> The bug seems to stem from this part of JobControlCompiler.getJobConf():
>                 if(mro.UDFs.size()==1){
>                     String compFuncSpec = mro.UDFs.get(0);
>                     Class comparator = PigContext.resolveClassName(compFuncSpec);
>                     if(ComparisonFunc.class.isAssignableFrom(comparator)) {
>                         jobConf.setMapperClass(PigMapReduce.MapWithComparator.class);
>                         jobConf.setReducerClass(PigMapReduce.ReduceWithComparator.class);
>                         jobConf.set("pig.reduce.package", ObjectSerializer.serialize(pack));
>                         jobConf.set("pig.usercomparator", "true");
>                         jobConf.setOutputKeyClass(NullableTuple.class);
>                         jobConf.setOutputKeyComparatorClass(comparator);
>                     }
>                 } else {
>                     jobConf.set("pig.sortOrder",
>                         ObjectSerializer.serialize(mro.getSortOrder()));
>                 }

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