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https://issues.apache.org/jira/browse/HIVE-4367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13884039#comment-13884039
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Lefty Leverenz commented on HIVE-4367:
--------------------------------------
When this is ready, documentation will be needed in the wiki:
* syntax goes in DDL's [Truncate Table section
|https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-TruncateTable]
* hive.truncate.skiptrash goes in [Configuration Properties
|https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties]
Configuration Properties doesn't have a section for DDL. One could be added,
or "Query Execution" could be renamed "HiveQL Execution" to encompass DDL and
queries. (That would also be useful for hive.support.quoted.identifiers from
HIVE-6013, which applies to both queries and DDL.)
> enhance TRUNCATE syntex to drop data of external table
> --------------------------------------------------------
>
> Key: HIVE-4367
> URL: https://issues.apache.org/jira/browse/HIVE-4367
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.11.0
> Reporter: caofangkun
> Assignee: caofangkun
> Priority: Minor
> Attachments: HIVE-4367-1.patch, HIVE-4367.2.patch.txt
>
>
> In my use case ,
> sometimes I have to remove data of external tables to free up storage space
> of the cluster .
> So it's necessary for to enhance the syntax like
> "TRUNCATE TABLE srcpart_truncate PARTITION (dt='201130412') FORCE;"
> to remove data from EXTERNAL table.
> And I add a configuration property to enable remove data to Trash
> <property>
> <name>hive.truncate.skiptrash</name>
> <value>false</value>
> <description>
> if true will remove data to trash, else false drop data immediately
> </description>
> </property>
> For example :
> hive (default)> TRUNCATE TABLE external1 partition (ds='11');
> FAILED: Error in semantic analysis: Cannot truncate non-managed table
> external1
> hive (default)> TRUNCATE TABLE external1 partition (ds='11') FORCE;
> [2013-04-16 17:15:52]: Compile Start
> [2013-04-16 17:15:52]: Compile End
> [2013-04-16 17:15:52]: OK
> [2013-04-16 17:15:52]: Time taken: 0.413 seconds
> hive (default)> set hive.truncate.skiptrash;
> hive.truncate.skiptrash=false
> hive (default)> set hive.truncate.skiptrash=true;
> hive (default)> TRUNCATE TABLE external1 partition (ds='12') FORCE;
> [2013-04-16 17:16:21]: Compile Start
> [2013-04-16 17:16:21]: Compile End
> [2013-04-16 17:16:21]: OK
> [2013-04-16 17:16:21]: Time taken: 0.143 seconds
> hive (default)> dfs -ls /user/test/.Trash/Current/;
> Found 1 items
> drwxr-xr-x -test supergroup 0 2013-04-16 17:06 /user/test/.Trash/Current/ds=11
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