[PIG-656] Use of eval or any other keyword in the package hierarchy of a UDF causes parse exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.3.0
• Fix Version/s: 0.3.0
• Component/s: documentation, grunt
• Hadoop Flags: Reviewed
• Assignee: Milind Barve
• Reporter: Viraj Bhat
• Created: 05/Feb/09 01:33
• Updated: 26/Jul/10 16:35
• Resolved: 26/May/09 20:25

Description

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?

Viraj