Use of eval word in the package hierarchy of a UDF causes parse exception
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                 Key: PIG-656
                 URL: https://issues.apache.org/jira/browse/PIG-656
             Project: Pig
          Issue Type: Bug
          Components: documentation, grunt
    Affects Versions: types_branch
            Reporter: Viraj Bhat
             Fix For: types_branch


Consider a Pig script which does something similar to a word count. It uses the 
built-in TOKENIZE function, but packages it inside a class hierarchy such as 
"mypackage.eval"
{code}
register TOKENIZE.jar
my_src  = LOAD '/user/viraj/mywordcount.txt' USING PigStorage('\t')  AS (mlist: 
chararray);
modules = FOREACH my_src GENERATE FLATTEN(mypackage.eval.TOKENIZE(mlist));
describe modules;
grouped = GROUP modules BY $0;
describe grouped;
counts  = FOREACH grouped GENERATE COUNT(modules), group;
ordered = ORDER counts BY $0;
dump ordered;
{code}

The parser complains:
===========================================================================================================================
2009-02-05 01:17:29,231 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 
1000: Error during parsing. Invalid alias: mypackage in {mlist: chararray}
===========================================================================================================================

I looked at the following source code at 
(src/org/apache/pig/impl/logicalLayer/parser/QueryParser.jjt) and it seems that 
: EVAL is a keyword in Pig. Here are some clarifications:

1) Is there documentation on what the EVAL keyword actually is?
2) Is EVAL keyword actually implemented?

Viraj

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