[jira] [Assigned] (HIVE-25773) Column descriptors might not deleted via direct sql

["Yu-Wen Lai (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-25773?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yu-Wen Lai reassigned HIVE-25773:
---------------------------------


> 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
>
> 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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