Jesus Camacho Rodriguez created HIVE-12393:
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Summary: Simplify ColumnPruner when CBO optimizes the query
Key: HIVE-12393
URL: https://issues.apache.org/jira/browse/HIVE-12393
Project: Hive
Issue Type: Bug
Components: Logical Optimizer
Affects Versions: 2.0.0
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
The plan for any given query optimized by CBO will always contain a Project
operator on top of the TS that prunes that columns that are not needed.
Thus, there is no need for Hive optimizer to traverse the whole plan to check
which columns can be pruned. In fact, Hive ColumnPruner optimizer only needs to
match TS operators when CBO optimized the plan.
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