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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4183) select * to console issues in Hive
Date Tue, 16 Sep 2008 07:25:44 GMT
select * to console issues in Hive

                 Key: HADOOP-4183
                 URL: https://issues.apache.org/jira/browse/HADOOP-4183
             Project: Hadoop Core
          Issue Type: Bug
          Components: contrib/hive
            Reporter: Joydeep Sen Sarma

the biggest problem is that select * is assuming that the output is a regular text file. it
can't read out from compressed text files. (which is what happens when we start using the
output compression options).

the core issue is that select * is special code. and it should not be. it should go through
the same 'fileinputformat' and serde code that any map-side task goes through.

the second issue is that a select * without any data transformations/filters goes through
a map-reduce task unnecessarily. we need to fix this. this seems related to the limit N jira
that ashish opened. (see hadoop-4086)

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