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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1178) LogicalPlan and Optimizer are too complex and hard to work with
Date Sat, 28 Aug 2010 08:23:53 GMT

    [ https://issues.apache.org/jira/browse/PIG-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903803#action_12903803
] 

Daniel Dai commented on PIG-1178:
---------------------------------

test-patch result for PIG-11780-8:

     [exec] +1 overall.
     [exec]
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec]
     [exec]     +1 tests included.  The patch appears to include 3 new or modified tests.
     [exec]
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec]
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec]
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec]
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.

Patch committed.

> LogicalPlan and Optimizer are too complex and hard to work with
> ---------------------------------------------------------------
>
>                 Key: PIG-1178
>                 URL: https://issues.apache.org/jira/browse/PIG-1178
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Alan Gates
>            Assignee: Daniel Dai
>             Fix For: 0.8.0
>
>         Attachments: expressions-2.patch, expressions.patch, lp.patch, lp.patch, PIG-1178-4.patch,
PIG-1178-5.patch, PIG-1178-6.patch, PIG-1178-7.patch, PIG-1178-8.patch, pig_1178.patch, pig_1178.patch,
PIG_1178.patch, pig_1178_2.patch, pig_1178_3.2.patch, pig_1178_3.3.patch, pig_1178_3.4.patch,
pig_1178_3.patch
>
>
> The current implementation of the logical plan and the logical optimizer in Pig has proven
to not be easily extensible. Developer feedback has indicated that adding new rules to the
optimizer is quite burdensome. In addition, the logical plan has been an area of numerous
bugs, many of which have been difficult to fix. Developers also feel that the logical plan
is difficult to understand and maintain. The root cause for these issues is that a number
of design decisions that were made as part of the 0.2 rewrite of the front end have now proven
to be sub-optimal. The heart of this proposal is to revisit a number of those proposals and
rebuild the logical plan with a simpler design that will make it much easier to maintain the
logical plan as well as extend the logical optimizer. 
> See http://wiki.apache.org/pig/PigLogicalPlanOptimizerRewrite for full details.

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