我有一个表table1，然后我用“create table table2 as select * from table1 where partition_key is not null;”复制它。 table1仅463.2 GB，但table2原来是2.8 TB。为什么会这样？
PS：我刚刚显示了分区，看来table1和table2的分区方式不同。所以我添加了我的问题：如何复制表并保留其原始分区信息？
table1：hdfs dfs -du -s -h /user/hive/warehouse/map_services.db/userhistory1/*
7.9 G 23.7 G /user/hive/warehouse/map_services.db/userhistory/datestr=1970-01-01
25.7 G 77.1 G /user/hive/warehouse/map_services.db/userhistory/datestr=2017-10-01
18.8 G 56.3 G /user/hive/warehouse/map_services.db/userhistory/datestr=2017-10-02
16.8 G 50.5 G /user/hive/warehouse/map_services.db/userhistory/datestr=2017-10-03
17.5 G 52.5 G /user/hive/warehouse/map_services.db/userhistory/datestr=2017-10-04
18.0 G 53.9 G /user/hive/warehouse/map_services.db/userhistory/datestr=2017-10-05
22.4 G 67.1 G /user/hive/warehouse/map_services.db/userhistory/datestr=2017-10-06
27.3 G 81.8 G /user/hive/warehouse/map_services.db/userhistory/datestr=2017-10-07
表2：hdfs dfs -du -s -h /user/hive/warehouse/map_services.db/userhistory2/*
929.2 M 2.7 G /user/hive/warehouse/map_services.db/userhistory2/000000_0
651.1 M 1.9 G /user/hive/warehouse/map_services.db/userhistory2/000001_0
1.1 G 3.3 G /user/hive/warehouse/map_services.db/userhistory2/000002_0
1.1 G 3.3 G /user/hive/warehouse/map_services.db/userhistory2/000003_0
1.6 G 4.7 G /user/hive/warehouse/map_services.db/userhistory2/000004_0
1.3 G 4.0 G /user/hive/warehouse/map_services.db/userhistory2/000005_0
1.2 G 3.7 G /user/hive/warehouse/map_services.db/userhistory2/000006_0
1.5 G 4.5 G /user/hive/warehouse/map_services.db/userhistory2/000007_0
1.5 G 4.4 G /user/hive/warehouse/map_services.db/userhistory2/000008_0
1.5 G 4.4 G /user/hive/warehouse/map_services.db/userhistory2/000009_0
1.5 G 4.5 G /user/hive/warehouse/map_services.db/userhistory2/000010_0
1.4 G 4.3 G /user/hive/warehouse/map_services.db/userhistory2/000011_0
1.4 G 4.3 G /user/hive/warehouse/map_services.db/userhistory2/000012_0
1.3 G 3.8 G /user/hive/warehouse/map_services.db/userhistory2/000013_0
1.5 G 4.4 G /user/hive/warehouse/map_services.db/userhistory2/000014_0
1.4 G 4.2 G /user/hive/warehouse/map_services.db/userhistory2/000015_0
1.2 G 3.6 G /user/hive/warehouse/map_services.db/userhistory2/000016_0
1.5 G 4.5 G /user/hive/warehouse/map_services.db/userhistory2/000017_0
1.5 G 4.4 G /user/hive/warehouse/map_services.db/userhistory2/000018_0
1.4 G 4.2 G /user/hive/warehouse/map_services.db/userhistory2/000019_0
1.5 G 4.6 G /user/hive/warehouse/map_services.db/userhistory2/000020_0
1.5 G 4.5 G /user/hive/warehouse/map_services.db/userhistory2/000021_0
1.6 G 4.7 G /user/hive/warehouse/map_services.db/userhistory2/000022_0
1.3 G 4.0 G /user/hive/warehouse/map_services.db/userhistory2/000023_0
1.1 G 3.4 G /user/hive/warehouse/map_services.db/userhistory2/000024_0
908.7 M 2.7 G /user/hive/warehouse/map_services.db/userhistory2/000025_0
1.4 G 4.2 G /user/hive/warehouse/map_services.db/userhistory2/000026_0
1.4 G 4.3 G /user/hive/warehouse/map_services.db/userhistory2/000027_0
1.3 G 3.8 G /user/hive/warehouse/map_services.db/userhistory2/000028_0
1.4 G 4.1 G /user/hive/warehouse/map_services.db/userhistory2/000029_0
1.6 G 4.7 G /user/hive/warehouse/map_services.db/userhistory2/000030_0
1.3 G 4.0 G /user/hive/warehouse/map_services.db/userhistory2/000031_0
1.3 G 4.0 G /user/hive/warehouse/map_services.db/userhistory2/000032_0
1.6 G 4.8 G /user/hive/warehouse/map_services.db/userhistory2/000033_0
1.5 G 4.4 G /user/hive/warehouse/map_services.db/userhistory2/000034_0
1.3 G 3.8 G /user/hive/warehouse/map_services.db/userhistory2/000035_0
940.0 M 2.8 G /user/hive/warehouse/map_services.db/userhistory2/000036_0
1.3 G 4.0 G /user/hive/warehouse/map_services.db/userhistory2/000037_0
1.2 G 3.6 G /user/hive/warehouse/map_services.db/userhistory2/000038_0
1.5 G 4.6 G /user/hive/warehouse/map_services.db/userhistory2/000039_0
1.2 G 3.7 G /user/hive/warehouse/map_services.db/userhistory2/000040_0
1.1 G 3.4 G /user/hive/warehouse/map_services.db/userhistory2/000041_0
1.1 G 3.4 G /user/hive/warehouse/map_services.db/userhistory2/000042_0
1.0 G 3.1 G /user/hive/warehouse/map_services.db/userhistory2/000043_0
1.4 G 4.3 G /user/hive/warehouse/map_services.db/userhistory2/000044_0
1.3 G 4.0 G /user/hive/warehouse/map_services.db/userhistory2/000045_0
1.4 G 4.1 G /user/hive/warehouse/map_services.db/userhistory2/000046_0
1.5 G 4.5 G /user/hive/warehouse/map_services.db/userhistory2/000047_0
1.1 G 3.3 G /user/hive/warehouse/map_services.db/userhistory2/000048_0
706.3 M 2.1 G /user/hive/warehouse/map_services.db/userhistory2/000049_0
1.4 G 4.2 G /user/hive/warehouse/map_services.db/userhistory2/000050_0
1.5 G 4.6 G /user/hive/warehouse/map_services.db/userhistory2/000051_0
872.2 M 2.6 G /user/hive/warehouse/map_services.db/userhistory2/000052_0
1.2 G 3.5 G /user/hive/warehouse/map_services.db/userhistory2/000053_0
1.2 G 3.7 G /user/hive/warehouse/map_services.db/userhistory2/000054_0
943.9 M 2.8 G /user/hive/warehouse/map_services.db/userhistory2/000055_0
1.6 G 4.7 G /user/hive/warehouse/map_services.db/userhistory2/000056_0
1.5 G 4.4 G /user/hive/warehouse/map_services.db/userhistory2/000057_0
1.3 G 4.0 G /user/hive/warehouse/map_services.db/userhistory2/000058_0
1.4 G 4.3 G /user/hive/warehouse/map_services.db/userhistory2/000059_0
961.5 M 2.8 G /user/hive/warehouse/map_services.db/userhistory2/000060_0
1.3 G 3.8 G /user/hive/warehouse/map_services.db/userhistory2/000061_0
1.4 G 4.3 G /user/hive/warehouse/map_services.db/userhistory2/000062_0
1.4 G 4.2 G /user/hive/warehouse/map_services.db/userhistory2/000063_0
1.4 G 4.1 G /user/hive/warehouse/map_services.db/userhistory2/000064_0
924.4 M 2.7 G /user/hive/warehouse/map_services.db/userhistory2/000065_0
答案 0 :(得分：1)
您的目标表未压缩且未分区。
要使用相同的分区创建表，请使用以下命令：
create table 2 like table1;
在插入前启用压缩：
SET hive.exec.compress.output=true;
插入覆盖动态分区：
set hive.exec.dynamic.partition=true;
set hive.exec.dynamic.partition.mode=nonstrict;
insert overwrite table2 partition(partition_key)
select * from table1;