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https://issues.apache.org/jira/browse/HIVE-16324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16015166#comment-16015166
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Lefty Leverenz commented on HIVE-16324:
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Thanks for the doc, [~vihangk1]. Here's a more direct link:
* [DDL -- TBLPROPERTIES clause |
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-listTableProperties]
> Truncate table should not work when EXTERNAL property of table is true
> ----------------------------------------------------------------------
>
> Key: HIVE-16324
> URL: https://issues.apache.org/jira/browse/HIVE-16324
> Project: Hive
> Issue Type: Bug
> Reporter: Vihang Karajgaonkar
> Assignee: Vihang Karajgaonkar
> Fix For: 3.0.0
>
> Attachments: HIVE-16324.01.patch
>
>
> Currently if you create an external table using the command {{CREATE EXTERNAL
> TABLE table_name}} the {{TRUNCATE table table_name}} command fails as
> expected because only managed tables should be allowed to be truncated.
> But if you set the external property of a previously managed table using
> {{ALTER TABLE table_name SET TBLPROPERTIES('EXTERNAL'='true')}}, truncate
> table command does not object and deletes all the data from the external
> table.
> Eg: This works but it should not ..
> {noformat}
> 0: jdbc:hive2://localhost:10000/default> create table test_ext2 (col1 string);
> No rows affected (0.424 seconds)
> 0: jdbc:hive2://localhost:10000/default> alter table test_ext2 set
> tblproperties ('EXTERNAL'='true');
> No rows affected (0.149 seconds)
> 0: jdbc:hive2://localhost:10000/default> insert into table test_ext2 values
> ("test");
> WARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the
> future versions. Consider using a different execution engine (i.e. spark,
> tez) or using Hive 1.X releases.
> No rows affected (3.447 seconds)
> 0: jdbc:hive2://localhost:10000/default>
> 0: jdbc:hive2://localhost:10000/default>
> 0: jdbc:hive2://localhost:10000/default> select * from test_ext2;
> +-----------------+
> | test_ext2.col1 |
> +-----------------+
> | test |
> +-----------------+
> 1 row selected (0.147 seconds)
> 0: jdbc:hive2://localhost:10000/default> truncate table test_ext2;
> No rows affected (0.138 seconds)
> 0: jdbc:hive2://localhost:10000/default> select * from test_ext2;
> +-----------------+
> | test_ext2.col1 |
> +-----------------+
> +-----------------+
> No rows selected (0.134 seconds)
> 0: jdbc:hive2://localhost:10000/default>
> {noformat}
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