Hive 如何在使用插入覆盖目录时创建表？

Question

I am wondering if it's possible to create(insert overwrite) a table when you are doing insert overwrite directory? The table should have the same data as stored in the directory. Right now I have something like:

INSERT OVERWRITE DIRECTORY somepath
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ' '
SELECT * FROM Table LIMIT 5;

I would like to have something like:

INSERT OVERWRITE DIRECTORY somepath AND Table sometable
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ' '
SELECT * FROM SOMETABLE LIMIT 5;

Can someone suggest if it's possible. Thanks!

Answer 1

You can do this using multi-table insert . Hive can insert into multiple tables and directories in single run. Multi Table Inserts minimize the number of data scans required. Hive can insert data into multiple tables/directories by scanning the input data just once (and applying different query operators) to the input data.

For example the statement below writes into table and into directory in a single statement (tested):

from 
(select 1 id, 'Santhosh' value union all
select 2 id, 'Rajesh' value union all
select 3 id, 'Valeriy' value )s

insert overwrite table test_1 select s.id, s.value

insert overwrite directory  'hdfs://your_dir/test_2' 
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ' '
select s.id, s.value;

You can also specify individual WHERE in each select.