tdh inceptor orc表和hdfs上表目录内文件的关系

Posted 2020-10-04

create table user1 (name string,age int ,sex string) stored as orc;
insert into user1 select ‘u1‘,1,‘nan‘ from system.dual;
select * from user1；

dfs -rm /inceptorsql1/user/hive/warehouse/default.db/hive/user1/000000_0;

select * from user1;

insert into user1 select ‘u1‘,1,‘nan‘ from system.dual;

随后用dfs命令查看user1的表目录。可见有000000_0文件。删除后表中无数据。重新填充数据准备后续实验。

 

create table user1_0 (name string,age int ,sex string) stored as orc;

创建了user1_0和user1有相同的列定义，都存成orc格式。

load data inpath ‘/inceptorsql1/user/hive/warehouse/default.db/hive/user1/‘ into table user1_0;
select * from user1_0;

将user1表目录中的文件copy到user1_0表。则user1_0表也有了数据。由此了解orc表和表目录下文件的关系。