LogicalPlan and Optimizer are too complex and hard to work with
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Key: PIG-1178
URL: https://issues.apache.org/jira/browse/PIG-1178
Project: Pig
Issue Type: Improvement
Reporter: Alan Gates
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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