[jira] Updated: (PIG-1618) Switch to new parser generator technology

["Xuefu Zhang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xuefu Zhang updated PIG-1618:
-----------------------------

    Attachment: antlr-3.2.jar
                NewParser-1.patch

First patch to address the issue. With this patch, the generated parse can parse pig script and generate a flat AST.

The patch contains antlr lib, but the lib may not be applied when it's patched. (for me, it didn't.) In that case, so the attached lib, antlr-3.2.jar can be put under pig lib directory.


> Switch to new parser generator technology
> -----------------------------------------
>
>                 Key: PIG-1618
>                 URL: https://issues.apache.org/jira/browse/PIG-1618
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.8.0
>            Reporter: Alan Gates
>            Assignee: Xuefu Zhang
>             Fix For: 0.9.0
>
>         Attachments: antlr-3.2.jar, NewParser-1.patch
>
>
> There are many bugs in Pig related to the parser, particularly to bad error messages.  After review of Java CC we feel these will be difficult to address using that tool.  Also, the .jjt files used by JavaCC are hard to understand and maintain.  
> ANTLR is being reviewed as the most likely choice to move to, but other parsers will be reviewed as well.
> This JIRA will act as an umbrella issue for other parser issues.

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