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https://issues.apache.org/jira/browse/PIG-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892960#action_12892960
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Alan Gates commented on PIG-1178:
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12K lines of code, wow!
In ProjectExpression, what does the new attachedRelationalOp do? javadoc
comments on that in the constructor would be good.
Is the purpose of this patch to also make this the default optimizer or leave
it in experimental mode? If it is to make it the default, I think we should
move it from the experimental package, though probably in a separate patch. If
it isn't, any thoughts on when it would be ready to become the default
optimizer?
> 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.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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