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https://issues.apache.org/jira/browse/HIVE-20598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich reassigned HIVE-20598:
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> Fix computeSortMergeCPUCost calculation
> ---------------------------------------
>
> Key: HIVE-20598
> URL: https://issues.apache.org/jira/browse/HIVE-20598
> Project: Hive
> Issue Type: Bug
> Components: Logical Optimizer
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> HIVE-10343 have made the costs changeable by hiveconf settings; however there
> was a method in which there was already a local variable named
> cpuCost....bottom line is the cost of n-way joins calculated by this method
> is computed as the product of the number of rows...
> https://github.com/apache/hive/blob/9c907769a63a6b23c91fdf0b3f3d0aa6387035dc/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/cost/HiveAlgorithmsUtil.java#L83
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