蜂房:按整数列的一部分进行分区 [英] Hive: Partitioning by part of integer column

问题描述

我想创建一个外部Hive表，按记录类型和日期(年，月，日)划分.一种复杂的情况是，我在数据文件中使用的日期格式是单值整数yyyymmddhhmmss，而不是所需的日期格式yyyy-mm-dd hh:mm:ss.是否可以仅基于单个数据值指定3个新分区列?类似于下面的示例(无效)

I want to create an external Hive table, partitioned by record type and date (year, month, day). One complication is that the date format I have in my data files is a single value integer yyyymmddhhmmss instead of the required date format yyyy-mm-dd hh:mm:ss. Can I specify 3 new partition column based on just single data value? Something like the example below (which doesn't work)

create external table cdrs (
record_id int, 
record_detail tinyint,
datetime_start int
)
partitioned by (record_type int, createyear=datetime_start(0,3) int, createmonth=datetime_start(4,5) int, createday=datetime_start(6,7) int)
row format delimited 
fields terminated by '|' 
lines terminated by '\n'
stored as TEXTFILE
location 'hdfs://nameservice1/tmp/sbx_unleashed.db'
tblproperties ("skip.header.line.count"="1", "skip.footer.line.count"="1");

推荐答案

如果您希望能够使用 MSCK REPAIR TABLE 根据目录结构为您添加分区，则应使用以下约定:

If you want to be able to use MSCK REPAIR TABLE to add the partition for you based on the directories structure you should use the following convention:

• 目录的嵌套应与分区列的顺序匹配.
• 目录名称应为 {分区列名称} = {value}

如果打算手动添加分区，则该结构没有意义.
任何设置值都可以与任何目录耦合.例如-

If you intends to add the partitions manually then the structure has no meaning.
Any set values can be coupled with any directory. e.g. -

alter table cdrs  
add if not exist partition (record_type='TYP123',createdate=date '2017-03-22') 
location 'hdfs://nameservice1/tmp/sbx_unleashed.db/2017MAR22_OF_TYPE_123';

---

假定目录结构-

---

Assuming directory structure -

.../sbx_unleashed.db/record_type=.../createyear=.../createmonth=.../createday=.../

例如

.../sbx_unleashed.db/record_type=TYP123/createyear=2017/createmonth=03/createday=22/

---

create external table cdrs 
(
   record_id      int
  ,record_detail  tinyint
  ,datetime_start int
)
partitioned by (record_type int,createyear int, createmonth tinyint, createday tinyint)
row format delimited 
fields terminated by '|' 
lines terminated by '\n'
stored as TEXTFILE
location 'hdfs://nameservice1/tmp/sbx_unleashed.db'
tblproperties ("skip.header.line.count"="1", "skip.footer.line.count"="1")
;

假定目录结构-

.../sbx_unleashed.db/record_type=.../createdate=.../

例如

.../sbx_unleashed.db/record_type=TYP123/createdate=2017-03-22/

---

create external table cdrs 
(
   record_id      int
  ,record_detail  tinyint
  ,datetime_start int
)
partitioned by (record_type int,createdate date)
row format delimited 
fields terminated by '|' 
lines terminated by '\n'
stored as TEXTFILE
location 'hdfs://nameservice1/tmp/sbx_unleashed.db'
tblproperties ("skip.header.line.count"="1", "skip.footer.line.count"="1")
;

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