Logical Optimizer: Expression optimizor rule
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Key: PIG-1399
URL: https://issues.apache.org/jira/browse/PIG-1399
Project: Pig
Issue Type: Improvement
Components: impl
Affects Versions: 0.7.0
Reporter: Daniel Dai
We can optimize expression in several ways:
1. Constant pre-calculation
Example:
B = filter A by a0 > 5+7;
=> B = filter A by a0 > 12;
2. Boolean expression optimization
Example:
B = filter A by not (not(a0>5) or a>10);
=> B = filter A by a0>5 and a<=10;
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