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From "Thejas M Nair (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1618) Switch to new parser generator technology
Date Sat, 15 Jan 2011 00:57:47 GMT

    [ https://issues.apache.org/jira/browse/PIG-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981990#action_12981990
] 

Thejas M Nair commented on PIG-1618:
------------------------------------

NewParser-11.patch committed to trunk with some additional comments to describe LogicalPlanBuilder.processExpressionPlan(..)

> Switch to new parser generator technology
> -----------------------------------------
>
>                 Key: PIG-1618
>                 URL: https://issues.apache.org/jira/browse/PIG-1618
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.8.0
>            Reporter: Alan Gates
>            Assignee: Xuefu Zhang
>             Fix For: 0.9.0
>
>         Attachments: antlr-3.2.jar, javadoc.patch, NewParser-1.patch, NewParser-10.patch,
NewParser-11.patch, NewParser-2.patch, NewParser-3.patch, NewParser-3.patch, NewParser-4.patch,
NewParser-5.patch, NewParser-6.patch, NewParser-7.patch, NewParser-8.patches, NewParser-9.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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