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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1178) LogicalPlan and Optimizer are too complex and hard to work with
Date Mon, 23 Aug 2010 19:07:17 GMT

     [ https://issues.apache.org/jira/browse/PIG-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-1178:
----------------------------

    Attachment: PIG-1178-7.patch

PIG-1178-7.patch switch the flag to use new logical plan by default. It fix most unit test
except:
1. TestMultiQuery.testMultiQueryJiraPig1169, it depends on PIG-1514, will be fixed automatically
once PIG-1514 check in
2. TestPruneColumn.testMapKey3

Both test cases are temporarily commented out. All other unit tests pass.

Here is test-patch result:
     [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 36 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.


> 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.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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