fixed index parsing error when no index name is provided

tools/dbutils/index.go

@@ -148,11 +148,12 @@ func ParseIndex(createIndexExpr string) Index {
 	nameTk.Separators('.')
 
 	nameParts, _ := nameTk.ScanAll()
-	if len(nameParts) == 2 {
+	switch len(nameParts) {
+	case 1:
+		result.IndexName = strings.Trim(nameParts[0], trimChars)
+	case 2:
 		result.SchemaName = strings.Trim(nameParts[0], trimChars)
 		result.IndexName = strings.Trim(nameParts[1], trimChars)
-	} else {
-		result.IndexName = strings.Trim(nameParts[0], trimChars)
 	}
 
 	// TableName

tools/dbutils/index_test.go

@@ -20,6 +20,15 @@ func TestParseIndex(t *testing.T) {
 			`invalid`,
 			dbutils.Index{},
 		},
+		// no names
+		{
+			`create index on ()`,
+			dbutils.Index{
+				IndexName: "",
+				TableName: "",
+				Columns:   []dbutils.IndexColumn{},
+			},
+		},
 		// simple (multiple spaces between the table and columns list)
 		{
 			`create index indexname on tablename   (col1)`,