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From "Pradeep Kamath (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-581) Pig should enable an option to disable the use of optimizer
Date Mon, 29 Dec 2008 19:02:44 GMT
Pig should enable an option to disable the use of optimizer
-----------------------------------------------------------

                 Key: PIG-581
                 URL: https://issues.apache.org/jira/browse/PIG-581
             Project: Pig
          Issue Type: Improvement
    Affects Versions: types_branch
            Reporter: Pradeep Kamath
             Fix For: types_branch


There are some cases where a combiner optimization chosen by Pig may actually be slower than
the non optimized version. For example, the use of combiner to address the issue reported
in https://issues.apache.org/jira/browse/PIG-580 could result in slower execution IF the distinct
on groups of values does not actually shrink those groups. This is however very data dependent
and the user may know before hand that this might be the case and may wish to disable the
use of the optimizer. Pig should enable an option to do so.

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