fields[i] = "field" + i;
        }
        queryFieldConfig.setSearchFields(fields);

        // Test field at the end (worst case for array lookup, but same for Set)
        String testField = "field999";

        // Warm up
        for (int i = 0; i < 100; i++) {
            queryCommand.isSearchField(testField);
        }

        // Measure Set-based lookup
        long startTime = System.nanoTime();

            fields[i] = "field" + i;
        }
        queryFieldConfig.setSortFields(fields);

        // Test field that appears at the end (worst case for array lookup)
        String testField = "field999";

        // Warm up
        for (int i = 0; i < 100; i++) {
            queryFieldConfig.isSortField(testField);
        }

        // Measure Set-based lookup (current implementation)