Правки

pkg/expr/expr_test.go

@@ -41,15 +41,6 @@ func TestIsExpression(t *testing.T) {
 		{"time", fmt.Sprintf("d > Time.Time('%s')", now.Format(time.RFC3339)), true},
 		{"in", "In(s, [1,2,3])", true},
 		{"in", "In(s, 1)", true},
-		{"exists#1", "exists(s)", true},
-		{"exists#2", "exists", false},
-		{"len#1", "len(s) == 1", true},
-		{"len#2", "len(s) != 1", true},
-		{"len#3", "len(s) > 1", true},
-		{"len#4", "len(s) >= 1", true},
-		{"len#5", "len(s) < 1", true},
-		{"len#6", "len(s) <= 1", true},
-		{"len#7", "len", false},
 		{"text search or id", "id", false},
 		{"numbers", "3", false},
 	}

pkg/expr/mongo.go

@@ -414,10 +414,7 @@ func (c *compiler) CallNode(node *ast.CallNode) interface{} {
 			panic("exists() expects exactly 1 argument")
 		}
 		field := c.identifier(node.Arguments[0])
-		return bson.M{"$or": bson.A{
-			bson.M{field: bson.M{"$exists": true, "$type": "array"}},
-			bson.M{field: bson.M{"$ne": nil}},
-		}}
+		return bson.M{field: bson.M{"$exists": true}}
 
 	case "icontains":
 		v := c.identifier(node.Arguments[0])

pkg/expr/mongo_test.go

@@ -30,7 +30,7 @@ func TestConvertToMongo(t *testing.T) {
 		{"equal", "s == 3", nil, bson.M{"s": 3}, false},
 		{"in array", "s in [1,2,3]", nil, bson.M{"s": bson.M{"$in": []interface{}{1, 2, 3}}}, false},
 		{"not in array", "s not in [1,2,3]", nil, bson.M{"s": bson.M{"$nin": []interface{}{1, 2, 3}}}, false},
-		{"exists#1", "exists(s)", nil, bson.M{"$or": bson.A{bson.M{"s": bson.M{"$exists": true, "$type": "array"}}, bson.M{"s": bson.M{"$ne": nil}}}}, false},
+		{"exists#1", "exists(s)", nil, bson.M{"s": bson.M{"$exists": true}}, false},
 		{"exists#2", "exists(s, s)", nil, nil, true},
 		{"len#1", "len(s)", nil, nil, true},
 		{"len#2", "len(s) <> 1", nil, nil, true},