Daniel Dai created PIG-3545:
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Summary: Seperate validation rules from optimizer
Key: PIG-3545
URL: https://issues.apache.org/jira/browse/PIG-3545
Project: Pig
Issue Type: Bug
Components: impl
Reporter: Daniel Dai
Assignee: Daniel Dai
Fix For: 0.13.0
A continuation of PIG-3492. We realize separate validation rules (such as
DuplicateForEachColumnRewriteVisitor, ImplicitSplitInsertVisitor) from
optimizer would make code clear. The reason is:
1. validation rule only need to run once
2. In contrast to optimization rule, validation rule works on an inconsistent
plan, and should be careful about precondition. Also some global operation such
as resetSchema is not possible on inconsistent plan
3. Some operations should work with unoptimized but validated plan, such as
describe
Also want to address PIG-3508 in the cleanup. We should call
LogicalPlan.optimize explicitly rather than rely on HExecutionEngine.compile to
do the logical plan optimization.
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