Qifan Chen created TRAFODION-1555:
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Summary: The existing heuristic to not consider MDAM scan is too
harsh
Key: TRAFODION-1555
URL: https://issues.apache.org/jira/browse/TRAFODION-1555
Project: Apache Trafodion
Issue Type: Bug
Components: sql-cmp
Reporter: Qifan Chen
Fix For: 2.0-incubating
The heuristic that the majority of the key columns should have key predicates
does not consider the UECs associated with each key column. The heuristic may
hurt scan performance when these UECs are very low.
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