Cost Based Query optimization in Hive
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Key: HIVE-1938
URL: https://issues.apache.org/jira/browse/HIVE-1938
Project: Hive
Issue Type: Improvement
Components: Query Processor
Environment: *nix,java
Reporter: bharath v
Current optimization in Hive is just rule-based and involves applying a set of
rules on the Plan tree. This depends on hints given by the user (which may or
may-not be correct) and might result in execution of costlier plans.So this
jira aims at building a cost-model which can give a good estimate various plans
before hand (using some meta-data already collected) and we can choose the best
plan which incurs the least cost.
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