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https://issues.apache.org/jira/browse/HIVE-15664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15831527#comment-15831527
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Matt McCline commented on HIVE-15664:
-------------------------------------
So, looks like you have a sparse column input VRB from the table but you need
to cache the data ORC style with non sparse so you share columns with the
destination (write) VRB.
> LLAP text cache: improve first query perf I
> -------------------------------------------
>
> Key: HIVE-15664
> URL: https://issues.apache.org/jira/browse/HIVE-15664
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-15664.patch, HIVE-15664.WIP.patch
>
>
> 1) Don't use ORC dictionary.
> 2) Use VectorDeserialize.
> 3) Don't parse the columns that are not included (cannot avoid reading them).
> -4) Send VRB to the pipeline and write ORC in parallel (in background)-.
> HIVE-15672
> Also add an option to disable the encoding pipeline server-side.
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