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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