配置单元从多个列创建地图

Question

我有一个包含ID和12列的表，我想从所有12列中创建地图：

基本表：

CREATE TABLE test_transposed(
id string,
jan double,
feb double,
mar double,
apr double,
may double,
jun double,
jul double,
aug double,
sep double,
oct double,
nov double,
dec double)
ROW FORMAT SERDE
STORED AS INPUTFORMAT
'org.apache.hadoop.mapred.TextInputFormat'
OUTPUTFORMAT
'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'

决赛桌：

CREATE TABLE test_map(
id string,
trans map<String,Double>)
ROW FORMAT SERDE
STORED AS INPUTFORMAT
'org.apache.hadoop.mapred.TextInputFormat'
OUTPUTFORMAT
'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'

实现此目标的最佳方法是什么？我在这里找到了类似的问题，但没有帮助。我不想将test_transposed数据写入文件，然后test_map在其上创建外部表。

Answer 1

create table test_map
stored as textfile
as
select  id
       ,map
        (
             'jan',jan
            ,'feb',feb
            ,'mar',mar
            ,'apr',apr
            ,'may',may
            ,'jun',jun
            ,'jul',jul
            ,'aug',aug
            ,'sep',sep
            ,'oct',oct
            ,'nov',nov
            ,'dec',dec
        )               as trans

from    test_transposed