diff --git a/pkg/streamingpromql/functions.go b/pkg/streamingpromql/functions.go
index 8a5d031fb9..4992b171a4 100644
--- a/pkg/streamingpromql/functions.go
+++ b/pkg/streamingpromql/functions.go
@@ -218,7 +218,8 @@ func ClampFunctionOperatorFactory(args []types.Operator, memoryConsumptionTracke
 		SeriesMetadataFunction: functions.DropSeriesName,
 	}
 
-	return functions.NewFunctionOverInstantVector(inner, []types.ScalarOperator{min, max}, memoryConsumptionTracker, f, expressionPosition, timeRange), nil
+	o := functions.NewFunctionOverInstantVector(inner, []types.ScalarOperator{min, max}, memoryConsumptionTracker, f, expressionPosition, timeRange)
+	return operators.NewDeduplicateAndMerge(o, memoryConsumptionTracker), nil
 }
 
 func ClampMinMaxFunctionOperatorFactory(functionName string, isMin bool) InstantVectorFunctionOperatorFactory {
@@ -245,7 +246,8 @@ func ClampMinMaxFunctionOperatorFactory(functionName string, isMin bool) Instant
 			SeriesMetadataFunction: functions.DropSeriesName,
 		}
 
-		return functions.NewFunctionOverInstantVector(inner, []types.ScalarOperator{clampTo}, memoryConsumptionTracker, f, expressionPosition, timeRange), nil
+		o := functions.NewFunctionOverInstantVector(inner, []types.ScalarOperator{clampTo}, memoryConsumptionTracker, f, expressionPosition, timeRange)
+		return operators.NewDeduplicateAndMerge(o, memoryConsumptionTracker), nil
 	}
 }
 
@@ -277,7 +279,8 @@ func RoundFunctionOperatorFactory(args []types.Operator, memoryConsumptionTracke
 		SeriesMetadataFunction: functions.DropSeriesName,
 	}
 
-	return functions.NewFunctionOverInstantVector(inner, []types.ScalarOperator{toNearest}, memoryConsumptionTracker, f, expressionPosition, timeRange), nil
+	o := functions.NewFunctionOverInstantVector(inner, []types.ScalarOperator{toNearest}, memoryConsumptionTracker, f, expressionPosition, timeRange)
+	return operators.NewDeduplicateAndMerge(o, memoryConsumptionTracker), nil
 }
 
 func HistogramQuantileFunctionOperatorFactory(args []types.Operator, memoryConsumptionTracker *limiting.MemoryConsumptionTracker, annotations *annotations.Annotations, expressionPosition posrange.PositionRange, timeRange types.QueryTimeRange) (types.InstantVectorOperator, error) {
@@ -331,7 +334,8 @@ func HistogramFractionFunctionOperatorFactory(args []types.Operator, memoryConsu
 		SeriesMetadataFunction: functions.DropSeriesName,
 	}
 
-	return functions.NewFunctionOverInstantVector(inner, []types.ScalarOperator{lower, upper}, memoryConsumptionTracker, f, expressionPosition, timeRange), nil
+	o := functions.NewFunctionOverInstantVector(inner, []types.ScalarOperator{lower, upper}, memoryConsumptionTracker, f, expressionPosition, timeRange)
+	return operators.NewDeduplicateAndMerge(o, memoryConsumptionTracker), nil
 }
 
 // These functions return an instant-vector.