76fc38
@@ -4622,6 +4622,7 @@
private Operator genGroupByPlanMapGroupByOperator(QB qb,
 
       if (ExprNodeDescUtils.indexOf(grpByExprNode, groupByKeys) >= 0) {
         // Skip duplicated grouping keys
+        grpByExprs.remove(i--);
         continue;
       }
       groupByKeys.add(grpByExprNode);
