diff --git a/engine/engine_test.go b/engine/engine_test.go
index ab11f4bc..4324c670 100644
--- a/engine/engine_test.go
+++ b/engine/engine_test.go
@@ -1500,6 +1500,24 @@ func TestQueriesAgainstOldEngine(t *testing.T) {
 			end:   time.Unix(3000, 0),
 			step:  2 * time.Second,
 		},
+		{
+			name: "absent with present series",
+			load: `load 30s
+				absent{pod="nginx-1", series="1"} 0
+				absent{pod="nginx-2", series="1"} 0`,
+			query: "absent(metric)",
+			start: time.Unix(0, 0),
+			end:   time.Unix(3000, 0),
+			step:  10 * time.Second,
+		},
+		{
+			name: "absent with non-present series",
+			load: "",
+			query: "absent(non_existent_metric)",
+			start: time.Unix(0, 0),
+			end:   time.Unix(3000, 0),
+			step:  10 * time.Second,
+		},
 	}
 
 	disableOptimizerOpts := []bool{true, false}
@@ -2431,6 +2449,22 @@ func TestInstantQuery(t *testing.T) {
 				http_requests_total{pod="nginx-2", series="1"} -10+1x50`,
 			query: "sgn(http_requests_total)",
 		},
+		{
+			name: "absent with present series",
+			load: `load 30s
+			absent{pod="nginx-1", series="1"} 0
+			absent{pod="nginx-2", series="1"} 0`,
+			query: "absent(metric)",
+			queryTime: time.Now(),
+			sortByLabels: true,
+	    },
+		{
+			name: "absent with non-present series",
+			load: "",
+			query: "absent(non_existent_metric)",
+			queryTime: time.Now(),
+			sortByLabels: false,
+		},
 	}
 
 	disableOptimizerOpts := []bool{true, false}
diff --git a/execution/function/functions.go b/execution/function/functions.go
index b4dc75e0..53c69999 100644
--- a/execution/function/functions.go
+++ b/execution/function/functions.go
@@ -7,8 +7,8 @@ import (
 	"fmt"
 	"math"
 	"time"
-
-	"github.com/efficientgo/core/errors"
+	
+    "github.com/efficientgo/core/errors"
 	"github.com/prometheus/prometheus/model/histogram"
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/prometheus/prometheus/promql"
@@ -434,6 +434,22 @@ var Funcs = map[string]FunctionCall{
 			return float64(t.Year())
 		})
 	},
+	"absent": func(f FunctionArgs) promql.Sample {
+		if len(f.Points) == 0 {
+			return promql.Sample{
+				Metric: f.Labels,
+				Point: promql.Point{
+					T: f.StepTime,
+					V: 1,
+				},
+			}
+		}
+
+		return promql.Sample{
+			Metric: f.Labels,
+			Point: promql.Point{},
+		}
+    },
 }
 
 func NewFunctionCall(f *parser.Function) (FunctionCall, error) {