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https://issues.apache.org/jira/browse/HIVE-13920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15312811#comment-15312811
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Sergey Shelukhin commented on HIVE-13920:
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Well, it would remove the allocation from the path that is JITted.
We can assume that at least a few can be pre-allocated (10-50?); also that it
matters more for larger splits (not large, 10s of ks of rows) than for 10k-size
splits that are fast enough as it is.
> LLAP: pre-populate CVB cache
> ----------------------------
>
> Key: HIVE-13920
> URL: https://issues.apache.org/jira/browse/HIVE-13920
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
>
> To avoid allocations on the main path, we should pre-populate the CVB cache.
> The main difficulty is propagating column indexes earlier to allocate correct
> vectors.
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