diff --git a/cmp.go b/cmp.go
index 45dfc17..b5869bd 100644
--- a/cmp.go
+++ b/cmp.go
@@ -25,9 +25,9 @@ const (
 
 func cmpInt(actual, expect int64, op string) bool {
 	switch op {
-	case opEqual,opIn:
+	case opEqual, opIn:
 		return actual == expect
-	case opNotEqual,opNotIn:
+	case opNotEqual, opNotIn:
 		return actual != expect
 	case opLarger:
 		return actual > expect
@@ -63,9 +63,9 @@ func cmpFloat(actual, expect float64, op string) bool {
 
 func cmpStr(actual, expect string, op string) bool {
 	switch op {
-	case opEqual,opIn:
+	case opEqual, opIn:
 		return actual == expect
-	case opNotEqual,opNotIn:
+	case opNotEqual, opNotIn:
 		return actual != expect
 	case opLarger:
 		return actual > expect
@@ -91,12 +91,19 @@ func cmpBool(actual, expect bool, op string) bool {
 	}
 }
 
-func compareSet(actual interface{}, expect []string, op string) bool {
+func shouldCompareSet(op string) bool {
 	switch op {
 	case opEqual, opNotEqual, opInter, opNotInter, opIn, opNotIn:
+		return true
 	default:
 		return false
 	}
+}
+
+func compareSet(actual interface{}, expect []string, op string) bool {
+	if !shouldCompareSet(op) {
+		return false
+	}
 	switch actualArr := actual.(type) {
 	case int:
 		return cmpIntSet([]int64{int64(actualArr)}, expect, op)
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..57b8ed3
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module github.com/caibirdme/yql
+
+go 1.15
+
+require (
+	github.com/antlr/antlr4 v0.0.0-20210121092344-5dce78c87a9e
+	github.com/stretchr/testify v1.7.0
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..179d3b9
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,13 @@
+github.com/antlr/antlr4 v0.0.0-20210121092344-5dce78c87a9e h1:1YJFJAhOCHWLME6YEBM0BI96x4P5mKEl6i6pdgg36WI=
+github.com/antlr/antlr4 v0.0.0-20210121092344-5dce78c87a9e/go.mod h1:T7PbCXFs94rrTttyxjbyT5+/1V8T2TYDejxUfHJjw1Y=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/yql.go b/yql.go
index bb0ffea..d9aa7f8 100644
--- a/yql.go
+++ b/yql.go
@@ -2,6 +2,7 @@ package yql
 
 import (
 	"fmt"
+	"reflect"
 	"strconv"
 
 	"github.com/antlr/antlr4/runtime/Go/antlr"
@@ -180,6 +181,9 @@ func compare(actualValue interface{}, expectValue []string, op string) bool {
 	if len(expectValue) > 1 {
 		return compareSet(actualValue, expectValue, op)
 	}
+	if reflect.TypeOf(actualValue).Kind() == reflect.Slice {
+		return compareSet(actualValue, expectValue, op)
+	}
 	e := removeQuote(expectValue[0])
 	switch actual := actualValue.(type) {
 	case int:
diff --git a/yql_test.go b/yql_test.go
index ae08232..79cd964 100644
--- a/yql_test.go
+++ b/yql_test.go
@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestHandleSyntaxErr(t *testing.T) {
@@ -1151,3 +1152,46 @@ func TestRule_Match_Multi(t *testing.T) {
 		ass.Equal(tc.out, ok, "data=%+v", tc.data)
 	}
 }
+
+func Test_Compare_Slice_And_One_Element(t *testing.T) {
+	should := require.New(t)
+	var testData = []struct {
+		rawYql string
+		data   map[string]interface{}
+		out    bool
+	}{
+		{
+			rawYql: `letter ∩ ('a')`,
+			data: map[string]interface{}{
+				"letter": []string{"a", "b", "c"},
+			},
+			out: true,
+		},
+		{
+			rawYql: `letter ∩ ('a', 'b')`,
+			data: map[string]interface{}{
+				"letter": []string{"a", "b", "c"},
+			},
+			out: true,
+		},
+		{
+			rawYql: `letter ∩ ('d')`,
+			data: map[string]interface{}{
+				"letter": []string{"a", "b", "c"},
+			},
+			out: false,
+		},
+		{
+			rawYql: `letter in ('a')`,
+			data: map[string]interface{}{
+				"letter": []string{"a", "b", "c"},
+			},
+			out: false,
+		},
+	}
+	for _, tc := range testData {
+		actual, err := Match(tc.rawYql, tc.data)
+		should.NoError(err)
+		should.Equal(tc.out, actual)
+	}
+}