make the logic match the logic in LazyResultGroupSorted

h2/src/main/org/h2/command/dml/Select.java

@@ -1451,8 +1451,9 @@ public class Select extends Query {
         protected Value[] fetchNextRow() {
             while ((sampleSize <= 0 || rowNumber < sampleSize) &&
                     topTableFilter.next()) {
-                setCurrentRowNumber(++rowNumber);
+                setCurrentRowNumber(rowNumber + 1);
                 if (isConditionMet()) {
+                    ++rowNumber;
                     Value[] row = new Value[columnCount];
                     for (int i = 0; i < columnCount; i++) {
                         Expression expr = expressions.get(i);
@@ -1460,7 +1461,6 @@ public class Select extends Query {
                     }
                     return row;
                 }
-                --rowNumber;
             }
             return null;
         }