cleanup extractfields
cleanup extractfields

trigrass2/ffjson,cw2018/ffjson,xladykiller/ffjson,xyliuke/ffjson,sunminghong/ffjson,pquerna/ffjson,sunminghong/ffjson,xiuzhifu/ffjson,xladykiller/ffjson,pquerna/ffjson,xyliuke/ffjson,cmeon/ffjson,trigrass2/ffjson,jamesliu96/ffjson,jamesliu96/ffjson,cw2018/ffjson,cmeon/ffjson,xiuzhifu/ffjson