add logical plan assumption checker
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Key: PIG-2176
URL: https://issues.apache.org/jira/browse/PIG-2176
Project: Pig
Issue Type: Improvement
Affects Versions: 0.9.0
Reporter: Thejas M Nair
Fix For: 0.9.0, 0.10
Pig expects certain things about LogicalPlan, and optimizer logic depends on
those to be true. Could that verifies that these assumptions are true will help
in catching issues early on.
Some of the assumptions that should be checked -
1. All schema have valid uid . (not -1).
2. All fields in schema have distinct uid.
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