diff --git a/go.mod b/go.mod
index 217a0bd83..d580636c6 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/DiSiqueira/GoTree v1.0.1-0.20180907134536-53a8e837f295
 	github.com/benlaurie/objecthash v0.0.0-20180202135721-d1e3d6079fc1
 	github.com/fatih/color v1.13.0
-	github.com/flyteorg/flyteidl v1.5.13
+	github.com/flyteorg/flyteidl v1.5.16
 	github.com/flyteorg/flyteplugins v1.1.30
 	github.com/flyteorg/flytestdlib v1.0.24
 	github.com/ghodss/yaml v1.0.0
diff --git a/go.sum b/go.sum
index e5f974662..b058b325e 100644
--- a/go.sum
+++ b/go.sum
@@ -242,8 +242,8 @@ github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5Kwzbycv
 github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
 github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
 github.com/felixge/httpsnoop v1.0.1/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
-github.com/flyteorg/flyteidl v1.5.13 h1:IQ2Cw+u36ew3BPyRDAcHdzc/GyNEOXOxhKy9jbS4hbo=
-github.com/flyteorg/flyteidl v1.5.13/go.mod h1:EtE/muM2lHHgBabjYcxqe9TWeJSL0kXwbI0RgVwI4Og=
+github.com/flyteorg/flyteidl v1.5.16 h1:S70wD7K99nKHZxmo8U16Jjhy1kZwoBh5ZQhZf3/6MPU=
+github.com/flyteorg/flyteidl v1.5.16/go.mod h1:EtE/muM2lHHgBabjYcxqe9TWeJSL0kXwbI0RgVwI4Og=
 github.com/flyteorg/flyteplugins v1.1.30 h1:AVqS6Eb9Nr9Z3Mb3CtP04ffAVS9LMx5Q1Z7AyFFk/e0=
 github.com/flyteorg/flyteplugins v1.1.30/go.mod h1:FujFQdL/f9r1HvFR81JCiNYusDy9F0lExhyoyMHXXbg=
 github.com/flyteorg/flytestdlib v1.0.24 h1:jDvymcjlsTRCwOtxPapro0WZBe3isTz+T3Tiq+mZUuk=
diff --git a/pkg/compiler/validators/condition.go b/pkg/compiler/validators/condition.go
index a70c5dcb2..e4f4d6753 100644
--- a/pkg/compiler/validators/condition.go
+++ b/pkg/compiler/validators/condition.go
@@ -15,6 +15,10 @@ func validateOperand(node c.NodeBuilder, paramName string, operand *flyte.Operan
 	} else if operand.GetPrimitive() != nil {
 		// no validation
 		literalType = literalTypeForPrimitive(operand.GetPrimitive())
+	} else if operand.GetScalar().GetPrimitive() != nil {
+		literalType = literalTypeForPrimitive(operand.GetPrimitive())
+	} else if operand.GetScalar().GetNoneType() != nil {
+		literalType = &flyte.LiteralType{Type: &flyte.LiteralType_Simple{Simple: flyte.SimpleType_NONE}}
 	} else if len(operand.GetVar()) > 0 {
 		if node.GetInterface() != nil {
 			if param, paramOk := validateInputVar(node, operand.GetVar(), requireParamType, errs.NewScope()); paramOk {
@@ -41,7 +45,10 @@ func ValidateBooleanExpression(w c.WorkflowBuilder, node c.NodeBuilder, expr *fl
 				expr.GetComparison().GetRightValue(), requireParamType, errs.NewScope())
 			op2Type, op2Valid := validateOperand(node, "LeftValue",
 				expr.GetComparison().GetLeftValue(), requireParamType, errs.NewScope())
-			if op1Valid && op2Valid && op1Type != nil && op2Type != nil {
+			// Valid expression
+			// 1. Both operands are primitive types and have the same types.
+			// 2. One of the operands is the None type.
+			if op1Valid && op2Valid && op1Type != nil && op2Type != nil && op1Type.GetSimple() != flyte.SimpleType_NONE && op2Type.GetSimple() != flyte.SimpleType_NONE {
 				if op1Type.String() != op2Type.String() {
 					errs.Collect(errors.NewMismatchingTypesErr(node.GetId(), "RightValue",
 						op1Type.String(), op2Type.String()))
diff --git a/pkg/controller/nodes/branch/comparator.go b/pkg/controller/nodes/branch/comparator.go
index 4fc4f2224..5a05b2001 100644
--- a/pkg/controller/nodes/branch/comparator.go
+++ b/pkg/controller/nodes/branch/comparator.go
@@ -71,9 +71,21 @@ var perTypeComparators = map[string]comparators{
 	},
 }
 
-func Evaluate(lValue *core.Primitive, rValue *core.Primitive, op core.ComparisonExpression_Operator) (bool, error) {
-	lValueType := reflect.TypeOf(lValue.Value)
-	rValueType := reflect.TypeOf(rValue.Value)
+func Evaluate(lValue *core.Scalar, rValue *core.Scalar, op core.ComparisonExpression_Operator) (bool, error) {
+	if lValue.GetNoneType() != nil || rValue.GetNoneType() != nil {
+		lIsNone := lValue.GetNoneType() != nil
+		rIsNone := rValue.GetNoneType() != nil
+		switch op {
+		case core.ComparisonExpression_EQ:
+			return lIsNone == rIsNone, nil
+		case core.ComparisonExpression_NEQ:
+			return lIsNone != rIsNone, nil
+		default:
+			return false, errors.Errorf(ErrorCodeMalformedBranch, "Comparison between nil and non-nil values with operator [%v] is not supported. lVal[%v]:rVal[%v]", op, lValue, rValue)
+		}
+	}
+	lValueType := reflect.TypeOf(lValue.GetPrimitive().Value)
+	rValueType := reflect.TypeOf(rValue.GetPrimitive().Value)
 	if lValueType != rValueType {
 		return false, errors.Errorf(ErrorCodeMalformedBranch, "Comparison between different primitives types. lVal[%v]:rVal[%v]", lValueType, rValueType)
 	}
@@ -90,50 +102,50 @@ func Evaluate(lValue *core.Primitive, rValue *core.Primitive, op core.Comparison
 		if isBoolean {
 			return false, errors.Errorf(ErrorCodeMalformedBranch, "[GT] not defined for boolean operands.")
 		}
-		return comps.gt(lValue, rValue), nil
+		return comps.gt(lValue.GetPrimitive(), rValue.GetPrimitive()), nil
 	case core.ComparisonExpression_GTE:
 		if isBoolean {
 			return false, errors.Errorf(ErrorCodeMalformedBranch, "[GTE] not defined for boolean operands.")
 		}
-		return comps.eq(lValue, rValue) || comps.gt(lValue, rValue), nil
+		return comps.eq(lValue.GetPrimitive(), rValue.GetPrimitive()) || comps.gt(lValue.GetPrimitive(), rValue.GetPrimitive()), nil
 	case core.ComparisonExpression_LT:
 		if isBoolean {
 			return false, errors.Errorf(ErrorCodeMalformedBranch, "[LT] not defined for boolean operands.")
 		}
-		return !(comps.gt(lValue, rValue) || comps.eq(lValue, rValue)), nil
+		return !(comps.gt(lValue.GetPrimitive(), rValue.GetPrimitive()) || comps.eq(lValue.GetPrimitive(), rValue.GetPrimitive())), nil
 	case core.ComparisonExpression_LTE:
 		if isBoolean {
 			return false, errors.Errorf(ErrorCodeMalformedBranch, "[LTE] not defined for boolean operands.")
 		}
-		return !comps.gt(lValue, rValue), nil
+		return !comps.gt(lValue.GetPrimitive(), rValue.GetPrimitive()), nil
 	case core.ComparisonExpression_EQ:
-		return comps.eq(lValue, rValue), nil
+		return comps.eq(lValue.GetPrimitive(), rValue.GetPrimitive()), nil
 	case core.ComparisonExpression_NEQ:
-		return !comps.eq(lValue, rValue), nil
+		return !comps.eq(lValue.GetPrimitive(), rValue.GetPrimitive()), nil
 	}
 	return false, errors.Errorf(ErrorCodeMalformedBranch, "Unsupported operator type in Propeller. System error.")
 }
 
-func Evaluate1(lValue *core.Primitive, rValue *core.Literal, op core.ComparisonExpression_Operator) (bool, error) {
-	if rValue.GetScalar() == nil || rValue.GetScalar().GetPrimitive() == nil {
-		return false, errors.Errorf(ErrorCodeMalformedBranch, "Only primitives can be compared. RHS Variable is non primitive.")
+func Evaluate1(lValue *core.Scalar, rValue *core.Literal, op core.ComparisonExpression_Operator) (bool, error) {
+	if rValue.GetScalar() == nil || (rValue.GetScalar().GetPrimitive() == nil && rValue.GetScalar().GetNoneType() == nil) {
+		return false, errors.Errorf(ErrorCodeMalformedBranch, "Only primitives can be compared. RHS Variable [%v] is non primitive", rValue)
 	}
-	return Evaluate(lValue, rValue.GetScalar().GetPrimitive(), op)
+	return Evaluate(lValue, rValue.GetScalar(), op)
 }
 
-func Evaluate2(lValue *core.Literal, rValue *core.Primitive, op core.ComparisonExpression_Operator) (bool, error) {
-	if lValue.GetScalar() == nil || lValue.GetScalar().GetPrimitive() == nil {
-		return false, errors.Errorf(ErrorCodeMalformedBranch, "Only primitives can be compared. LHS Variable is non primitive.")
+func Evaluate2(lValue *core.Literal, rValue *core.Scalar, op core.ComparisonExpression_Operator) (bool, error) {
+	if lValue.GetScalar() == nil || (lValue.GetScalar().GetPrimitive() == nil && lValue.GetScalar().GetNoneType() == nil) {
+		return false, errors.Errorf(ErrorCodeMalformedBranch, "Only primitives can be compared. LHS Variable [%v] is non primitive.", lValue)
 	}
-	return Evaluate(lValue.GetScalar().GetPrimitive(), rValue, op)
+	return Evaluate(lValue.GetScalar(), rValue, op)
 }
 
 func EvaluateLiterals(lValue *core.Literal, rValue *core.Literal, op core.ComparisonExpression_Operator) (bool, error) {
-	if lValue.GetScalar() == nil || lValue.GetScalar().GetPrimitive() == nil {
-		return false, errors.Errorf(ErrorCodeMalformedBranch, "Only primitives can be compared. LHS Variable is non primitive.")
+	if lValue.GetScalar() == nil || (lValue.GetScalar().GetPrimitive() == nil && lValue.GetScalar().GetNoneType() == nil) {
+		return false, errors.Errorf(ErrorCodeMalformedBranch, "Only primitives can be compared. LHS Variable [%v] is non primitive.", lValue)
 	}
-	if rValue.GetScalar() == nil || rValue.GetScalar().GetPrimitive() == nil {
-		return false, errors.Errorf(ErrorCodeMalformedBranch, "Only primitives can be compared. RHS Variable is non primitive")
+	if rValue.GetScalar() == nil || (rValue.GetScalar().GetPrimitive() == nil && rValue.GetScalar().GetNoneType() == nil) {
+		return false, errors.Errorf(ErrorCodeMalformedBranch, "Only primitives can be compared. RHS Variable [%v] is non primitive", rValue)
 	}
-	return Evaluate(lValue.GetScalar().GetPrimitive(), rValue.GetScalar().GetPrimitive(), op)
+	return Evaluate(lValue.GetScalar(), rValue.GetScalar(), op)
 }
diff --git a/pkg/controller/nodes/branch/comparator_test.go b/pkg/controller/nodes/branch/comparator_test.go
index d1c120ef4..21f60272a 100644
--- a/pkg/controller/nodes/branch/comparator_test.go
+++ b/pkg/controller/nodes/branch/comparator_test.go
@@ -11,8 +11,8 @@ import (
 )
 
 func TestEvaluate_int(t *testing.T) {
-	p1 := coreutils.MustMakePrimitive(1)
-	p2 := coreutils.MustMakePrimitive(2)
+	p1 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(1)}}
+	p2 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(2)}}
 	{
 		// p1 > p2 = false
 		b, err := Evaluate(p1, p2, core.ComparisonExpression_GT)
@@ -82,8 +82,8 @@ func TestEvaluate_int(t *testing.T) {
 }
 
 func TestEvaluate_float(t *testing.T) {
-	p1 := coreutils.MustMakePrimitive(1.0)
-	p2 := coreutils.MustMakePrimitive(2.0)
+	p1 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(1)}}
+	p2 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(2)}}
 	{
 		// p1 > p2 = false
 		b, err := Evaluate(p1, p2, core.ComparisonExpression_GT)
@@ -153,8 +153,8 @@ func TestEvaluate_float(t *testing.T) {
 }
 
 func TestEvaluate_string(t *testing.T) {
-	p1 := coreutils.MustMakePrimitive("a")
-	p2 := coreutils.MustMakePrimitive("b")
+	p1 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive("a")}}
+	p2 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive("b")}}
 	{
 		// p1 > p2 = false
 		b, err := Evaluate(p1, p2, core.ComparisonExpression_GT)
@@ -224,8 +224,8 @@ func TestEvaluate_string(t *testing.T) {
 }
 
 func TestEvaluate_datetime(t *testing.T) {
-	p1 := coreutils.MustMakePrimitive(time.Date(2018, 7, 4, 12, 00, 00, 00, time.UTC))
-	p2 := coreutils.MustMakePrimitive(time.Date(2018, 7, 4, 12, 00, 01, 00, time.UTC))
+	p1 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(time.Date(2018, 7, 4, 12, 00, 00, 00, time.UTC))}}
+	p2 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(time.Date(2018, 7, 4, 12, 00, 01, 00, time.UTC))}}
 	{
 		// p1 > p2 = false
 		b, err := Evaluate(p1, p2, core.ComparisonExpression_GT)
@@ -295,8 +295,8 @@ func TestEvaluate_datetime(t *testing.T) {
 }
 
 func TestEvaluate_duration(t *testing.T) {
-	p1 := coreutils.MustMakePrimitive(10 * time.Second)
-	p2 := coreutils.MustMakePrimitive(11 * time.Second)
+	p1 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(10 * time.Second)}}
+	p2 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(11 * time.Second)}}
 	{
 		// p1 > p2 = false
 		b, err := Evaluate(p1, p2, core.ComparisonExpression_GT)
@@ -366,8 +366,8 @@ func TestEvaluate_duration(t *testing.T) {
 }
 
 func TestEvaluate_boolean(t *testing.T) {
-	p1 := coreutils.MustMakePrimitive(true)
-	p2 := coreutils.MustMakePrimitive(false)
+	p1 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(true)}}
+	p2 := &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(false)}}
 	f := func(op core.ComparisonExpression_Operator) {
 		// GT/LT = false
 		msg := fmt.Sprintf("Evaluating: [%s]", op.String())
diff --git a/pkg/controller/nodes/branch/evaluator.go b/pkg/controller/nodes/branch/evaluator.go
index fe6d7edac..e81a127fb 100644
--- a/pkg/controller/nodes/branch/evaluator.go
+++ b/pkg/controller/nodes/branch/evaluator.go
@@ -20,31 +20,53 @@ const ErrorCodeFailedFetchOutputs = "FailedFetchOutputs"
 func EvaluateComparison(expr *core.ComparisonExpression, nodeInputs *core.LiteralMap) (bool, error) {
 	var lValue *core.Literal
 	var rValue *core.Literal
-	var lPrim *core.Primitive
-	var rPrim *core.Primitive
+	var lPrim *core.Scalar
+	var rPrim *core.Scalar
 
 	if expr.GetLeftValue().GetPrimitive() == nil {
-		if nodeInputs == nil {
-			return false, errors.Errorf(ErrorCodeMalformedBranch, "Failed to find Value for Variable [%v]", expr.GetLeftValue().GetVar())
+		if expr.GetLeftValue().GetScalar().GetNoneType() != nil {
+			lValue = &core.Literal{Value: &core.Literal_Scalar{Scalar: expr.GetLeftValue().GetScalar()}}
+		} else if expr.GetLeftValue().GetScalar().GetUnion() != nil {
+			lValue = expr.GetLeftValue().GetScalar().GetUnion().GetValue()
+		} else {
+			if nodeInputs == nil {
+				return false, errors.Errorf(ErrorCodeMalformedBranch, "Failed to find Value for Variable [%v]", expr.GetLeftValue().GetVar())
+			}
+			input := nodeInputs.Literals[expr.GetLeftValue().GetVar()]
+			if input.GetScalar().GetUnion().GetValue() != nil {
+				lValue = input.GetScalar().GetUnion().GetValue()
+			} else {
+				lValue = input
+			}
 		}
-		lValue = nodeInputs.Literals[expr.GetLeftValue().GetVar()]
 		if lValue == nil {
 			return false, errors.Errorf(ErrorCodeMalformedBranch, "Failed to find Value for Variable [%v]", expr.GetLeftValue().GetVar())
 		}
 	} else {
-		lPrim = expr.GetLeftValue().GetPrimitive()
+		lPrim = &core.Scalar{Value: &core.Scalar_Primitive{Primitive: expr.GetLeftValue().GetPrimitive()}}
 	}
 
 	if expr.GetRightValue().GetPrimitive() == nil {
-		if nodeInputs == nil {
-			return false, errors.Errorf(ErrorCodeMalformedBranch, "Failed to find Value for Variable [%v]", expr.GetLeftValue().GetVar())
+		if expr.GetRightValue().GetScalar().GetNoneType() != nil {
+			rValue = &core.Literal{Value: &core.Literal_Scalar{Scalar: expr.GetRightValue().GetScalar()}}
+		} else if expr.GetRightValue().GetScalar().GetUnion() != nil {
+			rValue = expr.GetRightValue().GetScalar().GetUnion().GetValue()
+		} else {
+			if nodeInputs == nil {
+				return false, errors.Errorf(ErrorCodeMalformedBranch, "Failed to find Value for Variable [%v]", expr.GetLeftValue().GetVar())
+			}
+			input := nodeInputs.Literals[expr.GetRightValue().GetVar()]
+			if input.GetScalar().GetUnion().GetValue() != nil {
+				rValue = input.GetScalar().GetUnion().GetValue()
+			} else {
+				rValue = input
+			}
 		}
-		rValue = nodeInputs.Literals[expr.GetRightValue().GetVar()]
 		if rValue == nil {
 			return false, errors.Errorf(ErrorCodeMalformedBranch, "Failed to find Value for Variable [%v]", expr.GetRightValue().GetVar())
 		}
 	} else {
-		rPrim = expr.GetRightValue().GetPrimitive()
+		rPrim = &core.Scalar{Value: &core.Scalar_Primitive{Primitive: expr.GetRightValue().GetPrimitive()}}
 	}
 
 	if lValue != nil && rValue != nil {
diff --git a/pkg/controller/nodes/branch/evaluator_test.go b/pkg/controller/nodes/branch/evaluator_test.go
index 895b73194..a64031ae2 100644
--- a/pkg/controller/nodes/branch/evaluator_test.go
+++ b/pkg/controller/nodes/branch/evaluator_test.go
@@ -56,6 +56,16 @@ func createUnaryConjunction(l *core.ComparisonExpression, op core.ConjunctionExp
 	}
 }
 
+func getNoneOperand() *core.Operand {
+	return &core.Operand{
+		Val: &core.Operand_Scalar{
+			Scalar: &core.Scalar{
+				Value: &core.Scalar_NoneType{NoneType: &core.Void{}},
+			},
+		},
+	}
+}
+
 func TestEvaluateComparison(t *testing.T) {
 	t.Run("ComparePrimitives", func(t *testing.T) {
 		// Compare primitives
@@ -100,6 +110,80 @@ func TestEvaluateComparison(t *testing.T) {
 		assert.NoError(t, err)
 		assert.False(t, v)
 	})
+	t.Run("CompareNoneAndLiteral", func(t *testing.T) {
+		// Compare lVal -> None and rVal -> literal
+		exp := &core.ComparisonExpression{
+			LeftValue: getNoneOperand(),
+			Operator:  core.ComparisonExpression_EQ,
+			RightValue: &core.Operand{
+				Val: &core.Operand_Primitive{
+					Primitive: coreutils.MustMakePrimitive(1),
+				},
+			},
+		}
+		v, err := EvaluateComparison(exp, nil)
+		assert.NoError(t, err)
+		assert.False(t, v)
+	})
+	t.Run("CompareLiteralAndNone", func(t *testing.T) {
+		// Compare lVal -> literal and rVal -> None
+		exp := &core.ComparisonExpression{
+			LeftValue: &core.Operand{
+				Val: &core.Operand_Primitive{
+					Primitive: coreutils.MustMakePrimitive(1),
+				},
+			},
+			Operator:   core.ComparisonExpression_NEQ,
+			RightValue: getNoneOperand(),
+		}
+		v, err := EvaluateComparison(exp, nil)
+		assert.NoError(t, err)
+		assert.True(t, v)
+	})
+	t.Run("CompareUnionLiteralAndNone", func(t *testing.T) {
+		// Compare lVal -> literal and rVal -> None
+		exp := &core.ComparisonExpression{
+			LeftValue: &core.Operand{
+				Val: &core.Operand_Scalar{
+					Scalar: &core.Scalar{
+						Value: &core.Scalar_Union{
+							Union: &core.Union{
+								Value: &core.Literal{
+									Value: &core.Literal_Scalar{Scalar: &core.Scalar{Value: &core.Scalar_Primitive{Primitive: coreutils.MustMakePrimitive(1)}}},
+								},
+							},
+						},
+					},
+				},
+			},
+			Operator:   core.ComparisonExpression_NEQ,
+			RightValue: getNoneOperand(),
+		}
+		v, err := EvaluateComparison(exp, nil)
+		assert.NoError(t, err)
+		assert.True(t, v)
+	})
+	t.Run("CompareNoneAndNone", func(t *testing.T) {
+		// Compare lVal -> None and rVal -> None
+		exp := &core.ComparisonExpression{
+			LeftValue:  getNoneOperand(),
+			Operator:   core.ComparisonExpression_EQ,
+			RightValue: getNoneOperand(),
+		}
+		v, err := EvaluateComparison(exp, nil)
+		assert.NoError(t, err)
+		assert.True(t, v)
+	})
+	t.Run("CompareNoneAndNoneWithError", func(t *testing.T) {
+		// Compare lVal -> None and rVal -> None
+		exp := &core.ComparisonExpression{
+			LeftValue:  getNoneOperand(),
+			Operator:   core.ComparisonExpression_GTE,
+			RightValue: getNoneOperand(),
+		}
+		_, err := EvaluateComparison(exp, nil)
+		assert.Error(t, err)
+	})
 	t.Run("CompareLiteralAndPrimitive", func(t *testing.T) {
 
 		// Compare lVal -> literal and rVal -> primitive