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From "Hari Sankar Sivarama Subramaniyan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-11405) Add early termination for recursion in StatsRulesProcFactory$FilterStatsRule.evaluateExpression for OR expression
Date Wed, 29 Jul 2015 22:27:04 GMT
Hari Sankar Sivarama Subramaniyan created HIVE-11405:
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             Summary: Add early termination for recursion in StatsRulesProcFactory$FilterStatsRule.evaluateExpression
 for OR expression
                 Key: HIVE-11405
                 URL: https://issues.apache.org/jira/browse/HIVE-11405
             Project: Hive
          Issue Type: Bug
            Reporter: Hari Sankar Sivarama Subramaniyan
            Assignee: Prasanth Jayachandran


Thanks for [~gopalv] for uncovering this as part of HIVE-11330.  Quoting him,
"The recursion protection works well with an AND expr, but it doesn't work against
(OR a=1 (OR a=2 (OR a=3 (OR ...)
since the for the rows will never be reduced during recursion due to the nature of the OR.
We need to execute a short-circuit to satisfy the OR properly - no case which matches a=1
qualifies for the rest of the filters.
Recursion should pass in the numRows - branch1Rows for the branch-2."



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