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From zellerh <...@git.apache.org>
Subject [GitHub] incubator-trafodion pull request: [TRAFODION-1585] Allow MDAM on i...
Date Tue, 17 Nov 2015 02:28:48 GMT
Github user zellerh commented on a diff in the pull request:

    https://github.com/apache/incubator-trafodion/pull/174#discussion_r45015547
  
    --- Diff: core/sql/optimizer/OptPhysRelExpr.cpp ---
    @@ -3910,6 +3910,20 @@ InputPhysicalProperty* NestedJoin::generateIpp(
       InputPhysicalProperty* ipp = NULL;
     
       // ----------------------------------------------------------------
    +  // If there is a cardinality constraint on the outer child, we'll
    +  // pass that information along to the inner child.
    +  // ----------------------------------------------------------------
    +  Cardinality minRows;
    +  Cardinality maxRows;
    +  CardConstraint * outerCardinalityConstraint = NULL;
    +
    +  if (getGroupAttr()->hasCardConstraint(minRows, maxRows))
    --- End diff --
    
    I would have expected that this would examine the join's left child's group attributes,
not those of the join itself?


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