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https://issues.apache.org/jira/browse/HIVE-24203?focusedWorklogId=530609&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-530609
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ASF GitHub Bot logged work on HIVE-24203:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Jan/21 11:02
Start Date: 04/Jan/21 11:02
Worklog Time Spent: 10m
Work Description: okumin opened a new pull request #1531:
URL: https://github.com/apache/hive/pull/1531
### What changes were proposed in this pull request?
Estimate statistics of LATERAL VIEW correctly.
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.
### Why are the changes needed?
Significant underestimation can happen when LATERAL VIEW increases the
number of records a lot and the source table has large.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Added one test case.
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Issue Time Tracking
-------------------
Worklog Id: (was: 530609)
Time Spent: 3.5h (was: 3h 20m)
> 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
> Labels: pull-request-available
> Time Spent: 3.5h
> Remaining Estimate: 0h
>
> 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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