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https://issues.apache.org/jira/browse/IMPALA-2485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-2485.
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Resolution: Later
This was just an idea, not concrete enough
> Use runtime row count information from blocking operators
> ---------------------------------------------------------
>
> Key: IMPALA-2485
> URL: https://issues.apache.org/jira/browse/IMPALA-2485
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.2
> Reporter: Tim Armstrong
> Priority: Minor
>
> At runtime we can obtain accurate row counts from blocking operators before
> dependent operators start execution. We could use this information to make
> smarter decisions about hash table sizing, etc.
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