Hive UDF test

get dual table by

CREATE TABLE dual (dummy STRING); 
INSERT INTO select 'x' from another_table limit 1;
select regexp_extract(‘foothebar’, ‘foo(.*?)(bar)’, 1) from dual;

http://stackoverflow.com/questions/9795668/does-hive-have-something-equivalent-to-dual

select regexp_extract(‘foothebar’, ‘foo(.*?)(bar)’, 1) from dual;

https://issues.apache.org/jira/browse/HIVE-3298

http://stackoverflow.com/questions/17425492/hive-insert-query-like-sql

http://my.oschina.net/repine/blog/193867#OSC_h3_15

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