[jira] [Commented] (HIVE-24920) TRANSLATED_TO_EXTERNAL tables may write to the same location

["Naveen Gangam (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-24920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17342267#comment-17342267 ] 

Naveen Gangam commented on HIVE-24920:
--------------------------------------

[~kgyrtkirk] an alternate approach which I think might be cleaner is to have AlterTableHandler treat such tables with (“TRANSLATED_TO_EXTERNAL” or (type=“EXTERNAL” + “external.table.purge=true”)) same as Managed/ACID tables? i.e. we relocate these tables on a rename just like we do for managed tables today.
create table test; --> table located in "test" directory
alter table test rename to test_renamed; --> because this table has property "TRANSLATED_TO_EXTERNAL" and/or "external.table.purge=true", we relocate this table data from dir "test" to dir "test_renamed"
create table test; --> creates a new table with dir "test"  

> TRANSLATED_TO_EXTERNAL tables may write to the same location
> ------------------------------------------------------------
>
>                 Key: HIVE-24920
>                 URL: https://issues.apache.org/jira/browse/HIVE-24920
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> {code}
> create table t (a integer);
> insert into t values(1);
> alter table t rename to t2;
> create table t (a integer); -- I expected an exception from this command (location already exists) but because its an external table no exception
> insert into t values(2);
> select * from t;  -- shows 1 and 2
> drop table t2;    -- wipes out data location
> select * from t;  -- empty resultset
> {code}



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