caofangkun created HIVE-4367:
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Summary: 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
Priority: Minor
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 - kun.cao supergroup 0 2013-04-16 17:06
/user/test/.Trash/Current/ds=11
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