Github user zellerh commented on a diff in the pull request:

    https://github.com/apache/incubator-trafodion/pull/826#discussion_r87305909
  
    --- Diff: core/sql/optimizer/BindRelExpr.cpp ---
    @@ -10298,10 +10331,17 @@ RelExpr *Insert::bindNode(BindWA *bindWA)
       }
     
       if (isUpsertThatNeedsMerge(isAlignedRowFormat, omittedDefaultCols, 
omittedCurrentDefaultClassCols)) {
    -    boundExpr = xformUpsertToMerge(bindWA);
    -    return boundExpr;
    +    if (CmpCommon::getDefault(TRAF_UPSERT_TO_EFF_TREE) == DF_OFF)  
    +      {
    +   boundExpr = xformUpsertToMerge(bindWA);  
    +   return boundExpr;
    +      }
    +      else if( CmpCommon::getDefault(TRAF_UPSERT_TO_EFF_TREE) == DF_ON)
    +   boundExpr = xformUpsertToEfficientTree(bindWA);
    +    
    --- End diff --
    
    This does nothing if TRAF_UPSERT_TO_EFF_TREE is set to something other than 
ON or OFF, is that ok? In this case we could produce incorrect results as far 
as I understand.


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