apache/spark — pull request #2770 by wangxiaojing (2014-10-11 16:14:57+00:00)
Title: [spark-3907][sql] add truncate table support

JIRA issue: [SPARK-3907]https://issues.apache.org/jira/browse/SPARK-3907
add turncate table support
TRUNCATE TABLE table_name [PARTITION partition_spec];

partition_spec:
: (partition_col = partition_col_value, partition_col = partiton_col_value, ...)
Removes all rows from a table or partition(s). Currently target table should be native/managed table or exception will be thrown. User can specify partial partition_spec for truncating multiple partitions at once and omitting partition_spec will truncate all partitions in the table.