diff --git a/cmd/simple/engine_test.go b/cmd/simple/engine_test.go
index d5c33b4..dbbaab9 100644
--- a/cmd/simple/engine_test.go
+++ b/cmd/simple/engine_test.go
@@ -18,9 +18,9 @@ func TestParquetFile(t *testing.T) {
 	_ = df.Show()
 
 	df = df.
-		Filter(logicalplan.Eq(
+		Filter(logicalplan.Lt(
 			logicalplan.ColumnExpr{Name: "c1"},
-			logicalplan.LiteralInt64Expr{Val: 200},
+			logicalplan.LiteralInt64Expr{Val: 300},
 		)).
 		Project(
 			logicalplan.ColumnExpr{Name: "c1"},
@@ -38,11 +38,11 @@ func TestParquetFile(t *testing.T) {
 
 	logicalPlan, _ := df.LogicalPlan()
 	fmt.Println(logicalplan.PrettyPrint(logicalPlan, 0))
-	assert.Equal(t, "Aggregate: groupExpr=[#c1], aggregateExpr=[sum(#c2)]\n\tProjection: #c1, #c2\n\t\tFilter: #c1 = 200\n\t\t\tInput: ../../test/data/c1_c2_c3_int64.parquet; projExpr=None\n", logicalplan.PrettyPrint(logicalPlan, 0))
+	assert.Equal(t, "Aggregate: groupExpr=[#c1], aggregateExpr=[sum(#c2)]\n\tProjection: #c1, #c2\n\t\tFilter: #c1 < 300\n\t\t\tInput: ../../test/data/c1_c2_c3_int64.parquet; projExpr=None\n", logicalplan.PrettyPrint(logicalPlan, 0))
 
 	logicalPlan, _ = df.OptimizedLogicalPlan()
 	fmt.Println(logicalplan.PrettyPrint(logicalPlan, 0))
-	assert.Equal(t, "Aggregate: groupExpr=[#c1], aggregateExpr=[sum(#c2)]\n\tProjection: #c1, #c2\n\t\tFilter: #c1 = 200\n\t\t\tInput: ../../test/data/c1_c2_c3_int64.parquet; projExpr=[c1 c2]\n", logicalplan.PrettyPrint(logicalPlan, 0))
+	assert.Equal(t, "Aggregate: groupExpr=[#c1], aggregateExpr=[sum(#c2)]\n\tProjection: #c1, #c2\n\t\tFilter: #c1 < 300\n\t\t\tInput: ../../test/data/c1_c2_c3_int64.parquet; projExpr=[c1 c2]\n", logicalplan.PrettyPrint(logicalPlan, 0))
 
 	err = df.Show()
 	if err != nil {
diff --git a/pkg/d_physicalplan/a_eval_expr/physical_expr.go b/pkg/d_physicalplan/a_eval_expr/physical_expr.go
index f93042f..98393ff 100644
--- a/pkg/d_physicalplan/a_eval_expr/physical_expr.go
+++ b/pkg/d_physicalplan/a_eval_expr/physical_expr.go
@@ -113,12 +113,15 @@ func (e BooleanBinaryExpr) Evaluate(input containers.IBatch) (containers.IVector
 func (e BooleanBinaryExpr) evaluate(l, r containers.IVector) (containers.IVector, error) {
 	res := make([]any, 0)
 	switch e.Op {
-	case "=":
-		for i := 0; i < l.Len(); i++ {
-			if l.GetValue(i) == r.GetValue(i) {
-				res = append(res, true)
-			} else {
-				res = append(res, false)
+	case "<":
+		switch l.DataType() {
+		case arrow.PrimitiveTypes.Int64:
+			for i := 0; i < l.Len(); i++ {
+				if l.GetValue(i).(int64) < r.GetValue(i).(int64) {
+					res = append(res, true)
+				} else {
+					res = append(res, false)
+				}
 			}
 		}
 		return containers.NewVector(arrow.FixedWidthTypes.Boolean, res), nil