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Posted to issues-all@impala.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2026/06/15 08:47:00 UTC

[jira] [Resolved] (IMPALA-14597) HBO Prototype for HdfsScanNode cardinality

     [ https://issues.apache.org/jira/browse/IMPALA-14597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang resolved IMPALA-14597.
-------------------------------------
    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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