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https://issues.apache.org/jira/browse/PIG-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831886#action_12831886
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Ashutosh Chauhan commented on PIG-1178:
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Was wondering about different optimizations that we do on a complied MR plan.
Not sure if its already been discussed or is in some doc. But essentially those
optimizations are also done through visitors and would benefit greatly if there
is a framework for them just as there is one for front-end. Is there any plan
to also subsume those visitors (possibly by rewriting them as rule-transform
pairs) in this new optimizer or will they be dealt with separately later on?
> 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: Ying He
> Attachments: expressions-2.patch, expressions.patch, lp.patch,
> lp.patch, pig_1178.patch, pig_1178.patch, PIG_1178.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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