added comment

Signed-off-by: Raza Jafri <[email protected]>
NVIDIA · Mar 23, 2021 · c40aa7a · c40aa7a
1 parent 41cabb9
commit c40aa7a
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/sql-plugin/src/main/scala/com/nvidia/spark/rapids/aggregate.scala b/sql-plugin/src/main/scala/com/nvidia/spark/rapids/aggregate.scala
@@ -871,7 +871,9 @@ case class GpuHashAggregateExec(
             }
           }
         }
-        // If cvs is empty, we add a single row with zero value.
+        // If cvs is empty, we add a single row with zero value. The value in the row is
+        // meaningless as it doesn't matter what we put in it. The projection will add a zero
+        // column to the result set in case of a parameter-less count.
         // This is to fix a bug in the plugin where a paramater-less count wasn't returning the
         // desired result compared to Spark-CPU.
         // For more details go to https://github.com/NVIDIA/spark-rapids/issues/1737