Ted Xu created HIVE-5771:
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Summary: Constant propagation optimizer for Hive
Key: HIVE-5771
URL: https://issues.apache.org/jira/browse/HIVE-5771
Project: Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Ted Xu
Assignee: Ted Xu
Currently there is no constant folding/propagation optimizer, all expressions
are evaluated at runtime.
HIVE-2470 did a great job on evaluating constants on UDF initializing phase,
however, it is still a runtime evaluation and it doesn't propagate constants
from a subquery to outside.
It may reduce I/O and accelerate process if we introduce such an optimizer.
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