【3】hive中关于partition的操作

hive> create table mp (a string) partitioned by (b string, c string); OK Time taken: 0.044 seconds hive> alter table mp add partition (b='1', c='1'); OK Time taken: 0.079 seconds hive> alter table mp add partition (b='1', c='2'); OK Time taken: 0.052 seconds hive> alter table mp add partition (b='2', c='2'); OK Time taken: 0.056 seconds hive> show partitions mp ; OK b=1/c=1 b=1/c=2 b=2/c=2 Time taken: 0.046 seconds hive> explain extended alter table mp drop partition (b='1'); OK ABSTRACT SYNTAX TREE:   (TOK_ALTERTABLE_DROPPARTS mp (TOK_PARTSPEC (TOK_PARTVAL b '1'))) STAGE DEPENDENCIES:   Stage-0 is a root stage STAGE PLANS:   Stage: Stage-0       Drop Table Operator:         Drop Table           table: mp Time taken: 0.048 seconds hive> alter table mp drop partition (b='1'); FAILED: Error in metadata: table is partitioned but partition spec is not specified or tab: {b=1} FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask hive> show partitions mp ; OK b=1/c=1 b=1/c=2 b=2/c=2 Time taken: 0.044 seconds hive> alter table mp add   partition ( b='1', c = '3') partition ( b='1' , c='4'); OK Time taken: 0.168 seconds hive> show partitions mp ; OK b=1/c=1 b=1/c=2 b=1/c=3 b=1/c=4 b=2/c=2 b=2/c=3 Time taken: 0.066 seconds hive>insert overwrite table mp partition (b='1', c='1') select cnt from tmp_et3 ; hive>alter table mp add columns (newcol string);   location指定目录结构 hive> alter table alter2 add partition (insertdate='2008-01-01') location '2008/01/01'; hive> alter table alter2 add partition (insertdate='2008-01-02') location '2008/01/02';