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Posted to dev@hive.apache.org by "Thejas M Nair (JIRA)" <ji...@apache.org> on 2014/01/04 02:05:50 UTC

[jira] [Created] (HIVE-6140) trim udf is very slow

Thejas M Nair created HIVE-6140:
-----------------------------------

             Summary: trim udf is very slow
                 Key: HIVE-6140
                 URL: https://issues.apache.org/jira/browse/HIVE-6140
             Project: Hive
          Issue Type: Bug
          Components: UDF
            Reporter: Thejas M Nair



Paraphrasing what was reported by [~cartershanklin] -

I used the attached Perl script to generate 500 million two-character strings which always included a space. I loaded it using:
create table letters (l string); 
load data local inpath '/home/sandbox/data.csv' overwrite into table letters;
Then I ran this SQL script:
select count(l) from letters where l = 'l ';
select count(l) from letters where trim(l) = 'l';

First query = 170 seconds
Second query  = 514 seconds





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