@Override
    public byte[] getBytes(int index) {
        String b64String = rows.get(row).getString(index);
        return Base64.getDecoder().decode(b64String);
    }
Vert.x turns byte[] into a B64 encoded string. Reverse it.

@see io.apiman.gateway.engine.components.jdbc.IJdbcResultSet#getBytes(int)
gateway/platforms/vertx3/vertx3/src/main/java/io/apiman/gateway/platforms/vertx3/components/jdbc/VertxJdbcResultSet.java