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https://issues.apache.org/jira/browse/HIVE-18600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt McCline reassigned HIVE-18600:
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> Vectorization: Top-Level Vector Expression Scratch Column Deallocation
> ----------------------------------------------------------------------
>
> Key: HIVE-18600
> URL: https://issues.apache.org/jira/browse/HIVE-18600
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Fix For: 3.0.0
>
>
> The operators create various vector expression *arrays* for predicates,
> SELECT clauses, key expressions, etc. We could have those be marked as
> special "top level" vector expression then we could defer deallocation until
> the top level expression is complete. This could be a simple solution that
> avoids trying fix our current eager deallocation that tries to reuse scratch
> columns as soon as possible. It *isn't optimal*, but it *shouldn't be too
> bad*. This solution is much better than not deallocating at all - especially
> for queries that SELECT a large number of columns or have a lot of
> expressions in the operator tree.
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