Fix selectivityEstimate Index field type (#397)

Author: jwierzbo

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Change Log
 
 ## [master](https://github.com/arangodb/go-driver/tree/master) (N/A)
+- Fix selectivityEstimate Index field type
 
 ## [1.3.1](https://github.com/arangodb/go-driver/tree/v1.3.1) (2022-03-23)
 - Add support for `exclusive` field for transaction options

collection_indexes_impl.go

@@ -43,7 +43,7 @@ type indexData struct {
 	Name                string   `json:"name,omitempty"`
 	FieldValueTypes     string   `json:"fieldValueTypes,omitempty"`
 	IsNewlyCreated      *bool    `json:"isNewlyCreated,omitempty"`
-	SelectivityEstimate int      `json:"selectivityEstimate,omitempty"`
+	SelectivityEstimate float64  `json:"selectivityEstimate,omitempty"`
 	BestIndexedLevel    int      `json:"bestIndexedLevel,omitempty"`
 	WorstIndexedLevel   int      `json:"worstIndexedLevel,omitempty"`
 

test/indexes_test.go

@@ -29,6 +29,7 @@ import (
 	"time"
 
 	driver "github.com/arangodb/go-driver"
+	"github.com/stretchr/testify/require"
 )
 
 // TestDefaultIndexes creates a collection without any custom index.
@@ -579,3 +580,33 @@ func TestTTLIndexesClusterInventory(t *testing.T) {
 	}
 
 }
+
+func TestPersistentIndexCreation(t *testing.T) {
+	c := createClientFromEnv(t, true)
+	skipBelowVersion(c, "3.7", t)
+
+	db := ensureDatabase(nil, c, "index_test_creation", nil, t)
+	coll := ensureCollection(nil, db, "index_creation_test_col", nil, t)
+
+	for i := 0; i < 16; i++ {
+		_, err := coll.CreateDocument(context.Background(), map[string]interface{}{
+			"MyIndex": fmt.Sprintf("%d", i),
+			"Index":   i,
+		})
+		require.NoError(t, err)
+	}
+
+	for i := 0; i < 100; i++ {
+		index, _, err := coll.EnsurePersistentIndex(
+			context.Background(),
+			[]string{"sensitivity"},
+			&driver.EnsurePersistentIndexOptions{
+				Unique: false,
+				Sparse: false,
+				Name:   "idx_sensitivity",
+			},
+		)
+		require.NoError(t, err)
+		require.NotNil(t, index)
+	}
+}