Add code to fix errors when participants is 0

Author: baobao0206

src/backend/executor/nodeHash.c

@@ -4075,13 +4075,6 @@ ExecHashTableDetach(HashJoinTable hashtable)
 {
 	ParallelHashJoinState *pstate = hashtable->parallel_state;
 
-	/*
-	 * If we're involved in a parallel query, we must either have gotten all
-	 * the way to PHJ_BUILD_RUN, or joined too late and be in PHJ_BUILD_FREE.
-	 */
-	Assert(!pstate ||
-		   BarrierPhase(&pstate->build_barrier) >= PHJ_BUILD_RUN);
-
 	if (pstate && BarrierPhase(&pstate->build_barrier) == PHJ_BUILD_RUN)
 	{
 		int			i;

src/backend/storage/ipc/barrier.c

@@ -220,11 +220,17 @@ BarrierArriveAndDetachExceptLast(Barrier *barrier)
 
 		return false;
 	}
-	Assert(barrier->participants == 1);
-	++barrier->phase;
-	SpinLockRelease(&barrier->mutex);
-
-	return true;
+	else if (barrier->participants == 1)
+	{
+		++barrier->phase;
+		SpinLockRelease(&barrier->mutex);
+		return true;
+	}
+	else
+	{
+		SpinLockRelease(&barrier->mutex);
+		return true;
+	}
 }
 
 /*