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https://issues.apache.org/jira/browse/PIG-2597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938224#comment-13938224
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Kyungho Jeon commented on PIG-2597:
-----------------------------------

Thank you [~daijy]. I was not aware of the issue with Macro. I will look into 
the issue and update the proposal. 

> Move grunt from javacc to ANTRL
> -------------------------------
>
>                 Key: PIG-2597
>                 URL: https://issues.apache.org/jira/browse/PIG-2597
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Jonathan Coveney
>            Assignee: Daniel Dai
>              Labels: gsoc2014
>         Attachments: pig02.diff
>
>
> Currently, the parser for queries is in ANTLR, but Grunt is still javacc. The 
> parser is very difficult to work with, and next to impossible to understand 
> or modify. ANTLR provides a much cleaner, more standard way to generate 
> parsers/lexers/ASTs/etc, and moving from javacc to Grunt would be huge as we 
> continue to add features to Pig.
> This is a candidate project for Google summer of code 2014. More information 
> about the program can be found at 
> https://cwiki.apache.org/confluence/display/PIG/GSoc2014



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