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https://issues.apache.org/jira/browse/HIVE-12393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15015461#comment-15015461
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Jesus Camacho Rodriguez commented on HIVE-12393:
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It does not need to be included in 2.0.0. More work needs to be done...
> 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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