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From "Viraj Bhat (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-656) Use of eval word in the package hierarchy of a UDF causes parse exception
Date Thu, 05 Feb 2009 01:33:59 GMT
Use of eval word in the package hierarchy of a UDF causes parse exception

                 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"
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;

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?


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