[kvstore] use static_cast
[kvstore] use static_cast

yajiedesign/mxnet,indhub/mxnet,piiswrong/mxnet,hotpxl/mxnet,coder-james/mxnet,sxjscience/mxnet,gautamkmr/incubator-mxnet,ForkedReposBak/mxnet,larroy/mxnet,tornadomeet/mxnet,Ldpe2G/mxnet,leezu/mxnet,tornadomeet/mxnet,jennyzhang0215/incubator-mxnet,yajiedesign/mxnet,precedenceguo/mxnet,lxn2/mxnet,arikpoz/mxnet,rishita/mxnet,luoyetx/mxnet,sergeykolychev/mxnet,stefanhenneking/mxnet,weleen/mxnet,danithaca/mxnet,tlby/mxnet,kkk669/mxnet,eric-haibin-lin/mxnet,leezu/mxnet,eric-haibin-lin/mxnet,DR08/mxnet,szha/mxnet,navrasio/mxnet,thirdwing/mxnet,antoan2/incubator-mxnet,jermainewang/mxnet,coder-james/mxnet,Northrend/mxnet,ZihengJiang/mxnet,yajiedesign/mxnet,apaleyes/mxnet,rahul003/mxnet,gautamkmr/incubator-mxnet,hotpxl/mxnet,Northrend/mxnet,jiajiechen/mxnet,crazy-cat/incubator-mxnet,tornadomeet/mxnet,danithaca/mxnet,CodingCat/mxnet,rishita/mxnet,tornadomeet/mxnet,jiajiechen/mxnet,jennyzhang0215/incubator-mxnet,yajiedesign/mxnet,hotpxl/mxnet,crazy-cat/incubator-mxnet,indhub/mxnet,mbaijal/incubator-mxnet,arank/mxnet,arikpoz/mxnet,crazy-cat/incubator-mxnet,wangyum/mxnet,rishita/mxnet,formath/mxnet,madjam/mxnet,ptrendx/mxnet,Northrend/mxnet,madjam/mxnet,reminisce/mxnet,hotpxl/mxnet,sxjscience/mxnet,hpi-xnor/BMXNet,Ldpe2G/mxnet,tlby/mxnet,Prasad9/incubator-mxnet,yuruofeifei/mxnet,Guneet-Dhillon/mxnet,CodingCat/mxnet,kevinthesun/mxnet,smolix/incubator-mxnet,ykim362/mxnet,likelyzhao/mxnet,solin319/incubator-mxnet,piiswrong/mxnet,TuSimple/mxnet,gautamkmr/incubator-mxnet,weleen/mxnet,indhub/mxnet,antoan2/incubator-mxnet,antoan2/incubator-mxnet,ForkedReposBak/mxnet,solin319/incubator-mxnet,navrasio/mxnet,nicklhy/mxnet,pluskid/mxnet,crazy-cat/incubator-mxnet,fullfanta/mxnet,tlby/mxnet,EvanzzzZ/mxnet,likelyzhao/mxnet,dmlc/mxnet,vikingMei/mxnet,smolix/incubator-mxnet,jamesliu/mxnet,sergeykolychev/mxnet,ShownX/incubator-mxnet,ShownX/incubator-mxnet,dmlc/mxnet,TuSimple/mxnet,weleen/mxnet,likelyzhao/mxnet,sergeykolychev/mxnet,tlby/mxnet,szha/mxnet,Northrend/mxnet,apaleyes/mxnet,EvanzzzZ/mxnet,CodingCat/mxnet,arank/mxnet,larroy/mxnet,stefanhenneking/mxnet,larroy/mxnet,arikpoz/mxnet,pluskid/mxnet,leezu/mxnet,ptrendx/mxnet,smolix/incubator-mxnet,arikpoz/mxnet,hesseltuinhof/mxnet,formath/mxnet,weleen/mxnet,TuSimple/mxnet,pluskid/mxnet,sxjscience/mxnet,kkk669/mxnet,jiajiechen/mxnet,nicklhy/mxnet,ykim362/mxnet,kevinthesun/mxnet,Northrend/mxnet,hesseltuinhof/mxnet,TuSimple/mxnet,jermainewang/mxnet,Mega-DatA-Lab/mxnet,Ldpe2G/mxnet,rahul003/mxnet,jennyzhang0215/incubator-mxnet,indhub/mxnet,sxjscience/mxnet,jiajiechen/mxnet,sxjscience/mxnet,Northrend/mxnet,saurabh3949/mxnet,xcgoner/dist-mxnet,sxjscience/mxnet,apache/incubator-mxnet,DickJC123/mxnet,antoan2/incubator-mxnet,wangyum/mxnet,ForkedReposBak/mxnet,sergeykolychev/mxnet,ShownX/incubator-mxnet,gautamkmr/incubator-mxnet,hotpxl/mxnet,navrasio/mxnet,zhreshold/mxnet,kevinthesun/mxnet,formath/mxnet,smolix/incubator-mxnet,ptrendx/mxnet,hpi-xnor/BMXNet,zhreshold/mxnet,TuSimple/mxnet,zhreshold/mxnet,stefanhenneking/mxnet,EvanzzzZ/mxnet,EvanzzzZ/mxnet,ForkedReposBak/mxnet,weleen/mxnet,rahul003/mxnet,reminisce/mxnet,formath/mxnet,arikpoz/mxnet,jermainewang/mxnet,hotpxl/mxnet,yajiedesign/mxnet,piiswrong/mxnet,mbaijal/incubator-mxnet,tlby/mxnet,jermainewang/mxnet,ForkedReposBak/mxnet,ShownX/incubator-mxnet,thirdwing/mxnet,indhub/mxnet,ShownX/incubator-mxnet,hpi-xnor/BMXNet,fullfanta/mxnet,yajiedesign/mxnet,precedenceguo/mxnet,reminisce/mxnet,TuSimple/mxnet,pluskid/mxnet,rishita/mxnet,rishita/mxnet,wangyum/mxnet,danithaca/mxnet,ZihengJiang/mxnet,arank/mxnet,gautamkmr/incubator-mxnet,nicklhy/mxnet,LinkHS/incubator-mxnet,precedenceguo/mxnet,hotpxl/mxnet,ShownX/incubator-mxnet,piiswrong/mxnet,madjam/mxnet,apache/incubator-mxnet,arank/mxnet,lxn2/mxnet,gautamkmr/incubator-mxnet,yuruofeifei/mxnet,danithaca/mxnet,CodingCat/mxnet,ykim362/mxnet,Guneet-Dhillon/mxnet,xcgoner/dist-mxnet,solin319/incubator-mxnet,vikingMei/mxnet,sxjscience/mxnet,Ldpe2G/mxnet,navrasio/mxnet,dmlc/mxnet,ykim362/mxnet,rishita/mxnet,reminisce/mxnet,reminisce/mxnet,EvanzzzZ/mxnet,ForkedReposBak/mxnet,LinkHS/incubator-mxnet,ykim362/mxnet,piiswrong/mxnet,EvanzzzZ/mxnet,nicklhy/mxnet,danithaca/mxnet,eric-haibin-lin/mxnet,DR08/mxnet,hpi-xnor/BMXNet,szha/mxnet,yuruofeifei/mxnet,formath/mxnet,jamesliu/mxnet,likelyzhao/mxnet,arank/mxnet,dmlc/mxnet,solin319/incubator-mxnet,jermainewang/mxnet,arank/mxnet,vikingMei/mxnet,Prasad9/incubator-mxnet,mbaijal/incubator-mxnet,Prasad9/incubator-mxnet,luoyetx/mxnet,luoyetx/mxnet,tlby/mxnet,crazy-cat/incubator-mxnet,jennyzhang0215/incubator-mxnet,jermainewang/mxnet,navrasio/mxnet,DR08/mxnet,hpi-xnor/BMXNet,jiajiechen/mxnet,mbaijal/incubator-mxnet,sergeykolychev/mxnet,mbaijal/incubator-mxnet,ZihengJiang/mxnet,solin319/incubator-mxnet,thirdwing/mxnet,navrasio/mxnet,ZihengJiang/mxnet,Mega-DatA-Lab/mxnet,jennyzhang0215/incubator-mxnet,kevinthesun/mxnet,formath/mxnet,Prasad9/incubator-mxnet,Ldpe2G/mxnet,danithaca/mxnet,TuSimple/mxnet,hesseltuinhof/mxnet,larroy/mxnet,ykim362/mxnet,arikpoz/mxnet,Guneet-Dhillon/mxnet,jamesliu/mxnet,danithaca/mxnet,zhreshold/mxnet,tornadomeet/mxnet,pluskid/mxnet,fullfanta/mxnet,pluskid/mxnet,saurabh3949/mxnet,coder-james/mxnet,DR08/mxnet,xcgoner/dist-mxnet,DR08/mxnet,lxn2/mxnet,yajiedesign/mxnet,szha/mxnet,DickJC123/mxnet,likelyzhao/mxnet,zhreshold/mxnet,jennyzhang0215/incubator-mxnet,tlby/mxnet,jermainewang/mxnet,zhreshold/mxnet,sxjscience/mxnet,szha/mxnet,Ldpe2G/mxnet,ptrendx/mxnet,Guneet-Dhillon/mxnet,precedenceguo/mxnet,antoan2/incubator-mxnet,coder-james/mxnet,jiajiechen/mxnet,hpi-xnor/BMXNet,hesseltuinhof/mxnet,luoyetx/mxnet,thirdwing/mxnet,stefanhenneking/mxnet,solin319/incubator-mxnet,tornadomeet/mxnet,weleen/mxnet,jennyzhang0215/incubator-mxnet,LinkHS/incubator-mxnet,fullfanta/mxnet,ShownX/incubator-mxnet,fullfanta/mxnet,vikingMei/mxnet,apaleyes/mxnet,zhreshold/mxnet,DickJC123/mxnet,EvanzzzZ/mxnet,Ldpe2G/mxnet,hesseltuinhof/mxnet,reminisce/mxnet,dmlc/mxnet,yuruofeifei/mxnet,thirdwing/mxnet,thirdwing/mxnet,apache/incubator-mxnet,jamesliu/mxnet,stefanhenneking/mxnet,Mega-DatA-Lab/mxnet,reminisce/mxnet,tornadomeet/mxnet,navrasio/mxnet,likelyzhao/mxnet,danithaca/mxnet,fullfanta/mxnet,DR08/mxnet,eric-haibin-lin/mxnet,formath/mxnet,leezu/mxnet,kkk669/mxnet,apaleyes/mxnet,likelyzhao/mxnet,ptrendx/mxnet,Guneet-Dhillon/mxnet,eric-haibin-lin/mxnet,jiajiechen/mxnet,kkk669/mxnet,xcgoner/dist-mxnet,hpi-xnor/BMXNet,lxn2/mxnet,yuruofeifei/mxnet,leezu/mxnet,formath/mxnet,kkk669/mxnet,likelyzhao/mxnet,jennyzhang0215/incubator-mxnet,ZihengJiang/mxnet,yuruofeifei/mxnet,hpi-xnor/BMXNet,tornadomeet/mxnet,xcgoner/dist-mxnet,reminisce/mxnet,piiswrong/mxnet,smolix/incubator-mxnet,ptrendx/mxnet,antoan2/incubator-mxnet,arikpoz/mxnet,hesseltuinhof/mxnet,Northrend/mxnet,jermainewang/mxnet,eric-haibin-lin/mxnet,larroy/mxnet,apaleyes/mxnet,xcgoner/dist-mxnet,yajiedesign/mxnet,lxn2/mxnet,kkk669/mxnet,xcgoner/dist-mxnet,eric-haibin-lin/mxnet,stefanhenneking/mxnet,Guneet-Dhillon/mxnet,kkk669/mxnet,DR08/mxnet,kevinthesun/mxnet,kevinthesun/mxnet,Guneet-Dhillon/mxnet,gautamkmr/incubator-mxnet,szha/mxnet,rishita/mxnet,LinkHS/incubator-mxnet,ZihengJiang/mxnet,rahul003/mxnet,vikingMei/mxnet,lxn2/mxnet,szha/mxnet,wangyum/mxnet,antoan2/incubator-mxnet,Prasad9/incubator-mxnet,jamesliu/mxnet,nicklhy/mxnet,ykim362/mxnet,leezu/mxnet,leezu/mxnet,saurabh3949/mxnet,Guneet-Dhillon/mxnet,apaleyes/mxnet,stefanhenneking/mxnet,lxn2/mxnet,weleen/mxnet,LinkHS/incubator-mxnet,Prasad9/incubator-mxnet,weleen/mxnet,CodingCat/mxnet,precedenceguo/mxnet,danithaca/mxnet,nicklhy/mxnet,larroy/mxnet,wangyum/mxnet,kkk669/mxnet,coder-james/mxnet,smolix/incubator-mxnet,precedenceguo/mxnet,stefanhenneking/mxnet,thirdwing/mxnet,apache/incubator-mxnet,jermainewang/mxnet,leezu/mxnet,nicklhy/mxnet,crazy-cat/incubator-mxnet,ForkedReposBak/mxnet,wangyum/mxnet,vikingMei/mxnet,rahul003/mxnet,crazy-cat/incubator-mxnet,dmlc/mxnet,TuSimple/mxnet,madjam/mxnet,arikpoz/mxnet,Northrend/mxnet,jennyzhang0215/incubator-mxnet,kevinthesun/mxnet,Mega-DatA-Lab/mxnet,ykim362/mxnet,hesseltuinhof/mxnet,sxjscience/mxnet,luoyetx/mxnet,EvanzzzZ/mxnet,piiswrong/mxnet,formath/mxnet,smolix/incubator-mxnet,ForkedReposBak/mxnet,luoyetx/mxnet,saurabh3949/mxnet,arank/mxnet,saurabh3949/mxnet,lxn2/mxnet,rahul003/mxnet,wangyum/mxnet,weleen/mxnet,Guneet-Dhillon/mxnet,luoyetx/mxnet,indhub/mxnet,tlby/mxnet,coder-james/mxnet,apaleyes/mxnet,eric-haibin-lin/mxnet,fullfanta/mxnet,jiajiechen/mxnet,antoan2/incubator-mxnet,thirdwing/mxnet,navrasio/mxnet,ZihengJiang/mxnet,Mega-DatA-Lab/mxnet,hesseltuinhof/mxnet,reminisce/mxnet,luoyetx/mxnet,wangyum/mxnet,saurabh3949/mxnet,saurabh3949/mxnet,Mega-DatA-Lab/mxnet,Mega-DatA-Lab/mxnet,vikingMei/mxnet,LinkHS/incubator-mxnet,arank/mxnet,ZihengJiang/mxnet,hpi-xnor/BMXNet,jamesliu/mxnet,fullfanta/mxnet,mbaijal/incubator-mxnet,larroy/mxnet,hotpxl/mxnet,rahul003/mxnet,tornadomeet/mxnet,crazy-cat/incubator-mxnet,gautamkmr/incubator-mxnet,TuSimple/mxnet,mbaijal/incubator-mxnet,vikingMei/mxnet,yuruofeifei/mxnet,solin319/incubator-mxnet,apaleyes/mxnet,xcgoner/dist-mxnet,LinkHS/incubator-mxnet,smolix/incubator-mxnet,yuruofeifei/mxnet,indhub/mxnet,Mega-DatA-Lab/mxnet,Ldpe2G/mxnet,zhreshold/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,antoan2/incubator-mxnet,kevinthesun/mxnet,szha/mxnet,DickJC123/mxnet,ptrendx/mxnet,hesseltuinhof/mxnet,luoyetx/mxnet,rahul003/mxnet,madjam/mxnet,ForkedReposBak/mxnet,tlby/mxnet,rahul003/mxnet,arank/mxnet,precedenceguo/mxnet,larroy/mxnet,pluskid/mxnet,vikingMei/mxnet,TuSimple/mxnet,apaleyes/mxnet,madjam/mxnet,CodingCat/mxnet,indhub/mxnet,DR08/mxnet,Prasad9/incubator-mxnet,EvanzzzZ/mxnet,CodingCat/mxnet,piiswrong/mxnet,madjam/mxnet,precedenceguo/mxnet,lxn2/mxnet,sergeykolychev/mxnet,jamesliu/mxnet,LinkHS/incubator-mxnet,Mega-DatA-Lab/mxnet,leezu/mxnet,rishita/mxnet,pluskid/mxnet,dmlc/mxnet,Northrend/mxnet,jamesliu/mxnet,DR08/mxnet,ShownX/incubator-mxnet,wangyum/mxnet,ptrendx/mxnet,nicklhy/mxnet,CodingCat/mxnet,yajiedesign/mxnet,reminisce/mxnet,Ldpe2G/mxnet,Prasad9/incubator-mxnet,coder-james/mxnet,zhreshold/mxnet,sergeykolychev/mxnet,ShownX/incubator-mxnet,rishita/mxnet,coder-james/mxnet,kevinthesun/mxnet,solin319/incubator-mxnet,saurabh3949/mxnet,sergeykolychev/mxnet,LinkHS/incubator-mxnet,larroy/mxnet,mbaijal/incubator-mxnet,ptrendx/mxnet,CodingCat/mxnet,ptrendx/mxnet,jamesliu/mxnet,precedenceguo/mxnet,smolix/incubator-mxnet,hotpxl/mxnet,mbaijal/incubator-mxnet,dmlc/mxnet,pluskid/mxnet,Prasad9/incubator-mxnet,madjam/mxnet,likelyzhao/mxnet,szha/mxnet,thirdwing/mxnet,ykim362/mxnet,navrasio/mxnet,ZihengJiang/mxnet,xcgoner/dist-mxnet,indhub/mxnet,piiswrong/mxnet,saurabh3949/mxnet,dmlc/mxnet,stefanhenneking/mxnet,crazy-cat/incubator-mxnet,kkk669/mxnet,jiajiechen/mxnet,arikpoz/mxnet,fullfanta/mxnet,gautamkmr/incubator-mxnet,coder-james/mxnet,yuruofeifei/mxnet,nicklhy/mxnet,madjam/mxnet,sergeykolychev/mxnet,solin319/incubator-mxnet