Fix SubQuery for raw sql

statement.go

@@ -438,6 +438,12 @@ func (stmt *Statement) clone() *Statement {
 		SkipHooks:            stmt.SkipHooks,
 	}
 
+	if stmt.SQL.Len() > 0 {
+		newStmt.SQL.WriteString(stmt.SQL.String())
+		newStmt.Vars = make([]interface{}, 0, len(stmt.Vars))
+		newStmt.Vars = append(newStmt.Vars, stmt.Vars...)
+	}
+
 	for k, c := range stmt.Clauses {
 		newStmt.Clauses[k] = c
 	}

tests/query_test.go

@@ -991,7 +991,16 @@ func TestSubQueryWithRaw(t *testing.T) {
 	DB.Create(&users)
 
 	var count int64
-	err := DB.Raw("select count(*) from (?) tmp",
+	err := DB.Raw("select count(*) from (?) tmp", DB.Raw("select name from users where age >= ? and name in (?)", 10, []string{"subquery_raw_1", "subquery_raw_3"})).Scan(&count).Error
+	if err != nil {
+		t.Errorf("Expected to get no errors, but got %v", err)
+	}
+
+	if count != 2 {
+		t.Errorf("Row count must be 1, instead got %d", count)
+	}
+
+	err = DB.Raw("select count(*) from (?) tmp",
 		DB.Table("users").
 			Select("name").
 			Where("age >= ? and name in (?)", 20, []string{"subquery_raw_1", "subquery_raw_3"}).