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https://issues.apache.org/jira/browse/TRAFODION-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Qifan Chen resolved TRAFODION-1555.
-----------------------------------
Resolution: Fixed
> 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
> Assignee: 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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