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https://issues.apache.org/jira/browse/IMPALA-14597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang resolved IMPALA-14597.
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Fix Version/s: Impala 5.0.0
Resolution: Fixed
Resolving this. Thanks to all the reviewers: [~amansinha], [~scarlin],
[~MikaelSmith], [~csringhofer] !
> HBO Prototype for HdfsScanNode cardinality
> ------------------------------------------
>
> Key: IMPALA-14597
> URL: https://issues.apache.org/jira/browse/IMPALA-14597
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend, Frontend
> Reporter: Quanlong Huang
> Assignee: Quanlong Huang
> Priority: Critical
> Fix For: Impala 5.0.0
>
>
> The prototype will extract ScanNode cardinalities in query profiles and store
> these historical stats in coordinator memory. Historical stats can be used in
> estimating cardinality of new queries.
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