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https://issues.apache.org/jira/browse/HIVE-25773?focusedWorklogId=690451&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-690451
]
ASF GitHub Bot logged work on HIVE-25773:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Dec/21 06:34
Start Date: 04/Dec/21 06:34
Worklog Time Spent: 10m
Work Description: hsnusonic opened a new pull request #2843:
URL: https://github.com/apache/hive/pull/2843
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### What changes were proposed in this pull request?
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To fix a bug in dropDanglingColumnDescriptors()
### Why are the changes needed?
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A dangling column descriptor might not be deleted via direct sql
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No
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existing tests
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Issue Time Tracking
-------------------
Worklog Id: (was: 690451)
Remaining Estimate: 0h
Time Spent: 10m
> Column descriptors might not deleted via direct sql
> ---------------------------------------------------
>
> Key: HIVE-25773
> URL: https://issues.apache.org/jira/browse/HIVE-25773
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Reporter: Yu-Wen Lai
> Assignee: Yu-Wen Lai
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Steps to reproduce:
> 1. create a partitioned table
> 2. add a partition _p_
> 3. add column to the partition _p_ (a column descriptor will be created)
> 4. drop partition _p_
> The new column descriptor still existed even though there's no relation left.
> We are currently using below SQL and extract the results that count = 0 as
> dangling column descriptors. However, it is impossible to get count = 0 from
> groupby query so they will never be deleted if it is not a table's default
> column descriptor.
>
> {code:java}
> SELECT SDS.CD_ID, count(1)
> FROM SDS WHERE SDS.CD_ID in (cdIds)
> GROUP BY SDS.CD_ID;{code}
>
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