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https://issues.apache.org/jira/browse/HIVE-24240?focusedWorklogId=552960&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-552960
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ASF GitHub Bot logged work on HIVE-24240:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 16/Feb/21 13:31
Start Date: 16/Feb/21 13:31
Worklog Time Spent: 10m
Work Description: okumin opened a new pull request #1984:
URL: https://github.com/apache/hive/pull/1984
https://issues.apache.org/jira/browse/HIVE-24240
### What changes were proposed in this pull request?
Fix incorrect computations to estimate UDTF size.
- Put 1 when numRows becomes zero because Hive expects it will be non-zero
in regular cases
- Use `StatsUtils .scaleColStatistics` to update col stats so as to update #
of distinct values
- Wrap the final stats with `applyRuntimeStats`
This is a follow-up of https://github.com/apache/hive/pull/1531.
### Why are the changes needed?
This PR would help Hive to compute more precise stats for UDTF.
### Does this PR introduce _any_ user-facing change?
Compatible from the point of view of users.
### How was this patch tested?
Revised one unit test.
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Issue Time Tracking
-------------------
Worklog Id: (was: 552960)
Remaining Estimate: 0h
Time Spent: 10m
> Implement missing features in UDTFStatsRule
> -------------------------------------------
>
> Key: HIVE-24240
> URL: https://issues.apache.org/jira/browse/HIVE-24240
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 4.0.0
> Reporter: okumin
> Assignee: okumin
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Add the following steps.
> * Handle the case in which the num row will be zero
> * Compute runtime stats in case of a re-execution
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