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

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

okumin created HIVE-24203:
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             Summary: 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


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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