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Posted to issues@drill.apache.org by "Aman Sinha (JIRA)" <ji...@apache.org> on 2015/02/27 01:26:04 UTC

[jira] [Created] (DRILL-2327) Upper bound on join's row_count_estimate_factor should be increased to handle expanding joins

Aman Sinha created DRILL-2327:
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             Summary: Upper bound on join's row_count_estimate_factor should be increased to handle expanding joins
                 Key: DRILL-2327
                 URL: https://issues.apache.org/jira/browse/DRILL-2327
             Project: Apache Drill
          Issue Type: Improvement
          Components: Query Planning & Optimization
            Reporter: Aman Sinha
            Assignee: Aman Sinha


The current bounds for planner.join.row_count_estimate_factor is between 0 to 100.  The default value is 1.0.  This parameter determines the estimated output cardinality of a join.  For hugely expanding joins, this is inadequate and we need to allow substantially larger upper bound. 



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