public static ClickHouseMapValue ofEmpty(Class<?> keyType, Class<?> valueType) {
        return new ClickHouseMapValue(Collections.emptyMap(), keyType, valueType);
    }
Creates an empty map.

@param keyType   non-null class of key
@param valueType non-null class of value
@return empty map
clickhouse-data/src/main/java/com/clickhouse/data/value/ClickHouseMapValue.java