[jira] [Assigned] (HIVE-9866) Changing a column's type doesn't change column stats type in metastore

["Chaoyu Tang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-9866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chaoyu Tang reassigned HIVE-9866:
---------------------------------

    Assignee: Chaoyu Tang

> Changing a column's type doesn't change column stats type in metastore 
> -----------------------------------------------------------------------
>
>                 Key: HIVE-9866
>                 URL: https://issues.apache.org/jira/browse/HIVE-9866
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Henry Robinson
>            Assignee: Chaoyu Tang
>
> If I have a table {{at}}, with a column {{id}} of type {{DOUBLE}}, the metastore will have an entry in {{TAB_COL_STATS}} something like:
> {code}
> hive_ms=> select "TABLE_NAME", "COLUMN_NAME", "COLUMN_TYPE" from "TAB_COL_STATS" WHERE "TBL_ID" = 1341 AND "COLUMN_NAME" = 'id';
>  TABLE_NAME | COLUMN_NAME | COLUMN_TYPE
> ------------+-------------+-------------
>  at         | id          | DOUBLE
> {code}
> If in Hive I then do:
> {{hive> alter table at change column id id int;}}
> The {{COLUMN_TYPE}} column does not change in the metastore. This means that any subsequent attempts to change the column statistics through the metastore client via {{updateTableColumnStatistics()}} will silently fail.



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