Refactor code to use a single graph, nodeprocessor, dispatcher and rule
abstraction
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Key: HIVE-186
URL: https://issues.apache.org/jira/browse/HIVE-186
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Ashish Thusoo
Assignee: Ashish Thusoo
Currently, the query processor has two different tree and rule abstractions -
one for ASTs and one for Operator Graphs. We should clean this up so that we
have a single abstraction that can be reused at different stages in the query
compiler.
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