Doris使用记录

创建分区表：

CREATE TABLE `test_partitioned` (
`gmt_create` datetime NULL COMMENT "创建时间",
`column1` varchar(64) NULL COMMENT "column1",
`column2` int(11) NULL COMMENT "column2",
`column3` varchar(64) NULL COMMENT "column3",
`column4` int(11) NULL COMMENT "column4",
`id` varchar(255) NULL COMMENT "uuid",
) ENGINE=OLAP
UNIQUE KEY(`gmt_create`,`column1`,`column2`,`column3`,`column4`,`id`)
COMMENT "测试表"
PARTITION BY RANGE(`gmt_create`)()
DISTRIBUTED BY HASH(`id`) BUCKETS 10
PROPERTIES (
"replication_allocation" = "tag.location.default: 3",
"in_memory" = "false",
"storage_format" = "V2",
"dynamic_partition.enable" = "true",
"dynamic_partition.time_unit" = "DAY",
"dynamic_partition.end" = "1",
"dynamic_partition.start" = "-5", // 数字绝对值表示end之前保存的partition数量，如果要保存历史partition，不需要指定改参数
"dynamic_partition.prefix" = "p",
"dynamic_partition.buckets" = "10"
);

查看数据量；

SHOW DATA FROM test;

查看分区

SHOW PARTITIONS FROM test;

手动添加分区

ALTER TABLE test SET ("dynamic_partition.enable" = "false");
ALTER TABLE test 
ADD PARTITION p20221101 VALUES LESS THAN ("2022-11-02 00:00:00")
("replication_num"="3");

删除分区：

ALTER TABLE test
DROP PARTITION p20230101;

导入数据

insert into test
SELECT
`gmt_create` ,
`column1` ,
`column2`,
`column3` ,
`column4` ,
`id` ,
from test2 where gmt_create> '2023-01-01 00:00:00';

修改列类型

ALTER TABLE test MODIFY COLUMN gmt_create datetime NULL COMMENT "创建时间" ;