presto-mysql/src/main/java/io/prestosql/plugin/mysql/MySqlClient.java/MySqlClient/createJsonParser
class MySqlClient:    private static JsonParser createJsonParser(Slice json)
            throws IOException
    {
        // Jackson tries to detect the character encoding automatically when using InputStream
        // so we pass an InputStreamReader instead.
        return JSON_FACTORY.createParser(new InputStreamReader(json.getInput(), UTF_8));
    }