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Posted to issues@hive.apache.org by "okumin (Jira)" <ji...@apache.org> on 2020/09/28 03:07:00 UTC

[jira] [Assigned] (HIVE-24203) Implement stats annotation rule for the LateralViewJoinOperator

     [ https://issues.apache.org/jira/browse/HIVE-24203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

okumin reassigned HIVE-24203:
-----------------------------


> Implement stats annotation rule for the LateralViewJoinOperator
> ---------------------------------------------------------------
>
>                 Key: HIVE-24203
>                 URL: https://issues.apache.org/jira/browse/HIVE-24203
>             Project: Hive
>          Issue Type: Improvement
>          Components: Physical Optimizer
>    Affects Versions: 2.3.7, 3.1.2, 4.0.0
>            Reporter: okumin
>            Assignee: okumin
>            Priority: Major
>
> StatsRulesProcFactory doesn't have any rules to handle a JOIN by LATERAL VIEW.
> This can cause an underestimation in case that UDTF in LATERAL VIEW generates multiple rows.
> HIVE-20262 has already added the rule for UDTF.
> This issue would add the rule for LateralViewJoinOperator.



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