Vikram Dixit K created HIVE-5095:
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Summary: Hive needs new operator walker for
parallelization/optimization.
Key: HIVE-5095
URL: https://issues.apache.org/jira/browse/HIVE-5095
Project: Hive
Issue Type: Bug
Components: Tez
Affects Versions: tez-branch
Reporter: Vikram Dixit K
Assignee: Vikram Dixit K
Fix For: tez-branch
For tez to compute the number of reducers, we should be walking the operator
tree in a topological fashion so that the reducers down the tree get the
estimate from all parents. However, the current walkers in hive only walk the
operator tree in a depth-first fashion. We need to add a new walker for the
topological walk. Also, since information about the parent operators needs to
be propagated on a per parent basis, we need to retain some context across
operators to be passed to the child which the walker will co-ordinate.
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