Replaced the String with a PickleType for the extra field.
Replaced the String with a PickleType for the extra field.

dromanow/flaskbb,China-jp/flaskbb,realityone/flaskbb,SeanChen0617/flaskbb,Aaron1992/flaskbb,dromanow/flaskbb,lucius-feng/flaskbb,SeanChen0617/flaskbb,qitianchan/flaskbb,realityone/flaskbb,emile2016/flaskbb,lucius-feng/flaskbb,SeanChen0617/flaskbb-1,qitianchan/flaskbb,dromanow/flaskbb,lucius-feng/flaskbb,Aaron1992/flaskbb,zky001/flaskbb,zky001/flaskbb,Aaron1992/flaskbb,realityone/flaskbb,emile2016/flaskbb,SeanChen0617/flaskbb,zky001/flaskbb,China-jp/flaskbb,China-jp/flaskbb,SeanChen0617/flaskbb-1,SeanChen0617/flaskbb-1,emile2016/flaskbb,qitianchan/flaskbb