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https://issues.apache.org/jira/browse/HIVE-627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730495#action_12730495
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Zheng Shao commented on HIVE-627:
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Talked with Namit offline. Namit can add more details, but the synopsis is that
we should be able to do it, and the best way is to wipe out the RowResolvers
before we enter into the optimization phase.
> Optimizer should only access RowSchema (and not RowResolver)
> ------------------------------------------------------------
>
> Key: HIVE-627
> URL: https://issues.apache.org/jira/browse/HIVE-627
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: Zheng Shao
>
> The column pruner is accessing RowResolver a lot of times, for things like
> reverseLookup, and get(alias, column).
> These are not necessary - we should not need to translate an internal name to
> (alias, column) and then translate back. We should be able to use internal
> name from one operator to the other, using RowSchema.
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