[jira] [Work logged] (HIVE-25328) Limit scope of REPLACE COLUMNS for Iceberg tables

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-25328?focusedWorklogId=622496&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-622496 ]

ASF GitHub Bot logged work on HIVE-25328:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 14/Jul/21 13:12
            Start Date: 14/Jul/21 13:12
    Worklog Time Spent: 10m 
      Work Description: marton-bod opened a new pull request #2475:
URL: https://github.com/apache/hive/pull/2475


   ### What changes were proposed in this pull request?
   Use `REPLACE COLUMNS` only for dropping one or more columns. If there's any column reorder, column rename, adding columns, changing column type or changing column comment, we throw an exception.
   
   ### Why are the changes needed?
   Limit the damage the user can do with this command :)
   
   ### Does this PR introduce _any_ user-facing change?
   Yes, limitation of the REPLACE command (but only for Iceberg tables; Hive tables are unaffected).
   
   ### How was this patch tested?
   unit tests


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 622496)
    Remaining Estimate: 0h
            Time Spent: 10m

> Limit scope of REPLACE COLUMNS for Iceberg tables
> -------------------------------------------------
>
>                 Key: HIVE-25328
>                 URL: https://issues.apache.org/jira/browse/HIVE-25328
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Marton Bod
>            Assignee: Marton Bod
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Replace columns is a rather wildcard operation which can do heavy-weight schema changes. We would only want to allow this operation for dropping columns for Iceberg tables. For other changes (adding cols, renaming, type promotion etc.), we should use the CHANGE COLUMN command.



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