Add countByKey(), reduceByKeyLocally() to Python API
Add countByKey(), reduceByKeyLocally() to Python API

saturday-shi/spark,sahilTakiar/spark,bOOm-X/spark,maropu/spark,liutang123/spark,janewangfb/spark,gioenn/xSpark,brad-kaiser/spark,pgandhi999/spark,rekhajoshm/spark,icexelloss/spark,tengpeng/spark,jkbradley/spark,stanzhai/spark,chuckchen/spark,sachintyagi22/spark,pronix/spark,aosagie/spark,zhouyejoe/spark,witgo/spark,dbtsai/spark,hvanhovell/spark,shaneknapp/spark,tejasapatil/spark,milliman/spark,michalsenkyr/spark,akopich/spark,JoshRosen/spark,jrshust/spark,jianran/spark,narahari92/spark,patrick-nicholson/spark,rikima/spark,saltstar/spark,jkbradley/spark,highfei2011/spark,dongjoon-hyun/spark,WeichenXu123/spark,icexelloss/spark,rednaxelafx/apache-spark,dhruve/spark,yanboliang/spark,esi-mineset/spark,ibm-research-ireland/sparkoscope,andrewor14/iolap,mzl9039/spark,publicRoman/spark,michalsenkyr/spark,wzhfy/spark,wangyum/spark,nlalevee/spark,nilsgrabbert/spark,cin/spark,ahnqirage/spark,vax11780/spark,akopich/spark,pgandhi999/spark,patrick-nicholson/spark,mike0sv/spark,techaddict/spark,ioana-delaney/spark,mkolod/incubator-spark,poffuomo/spark,mzl9039/spark,highfei2011/spark,vinodkc/spark,huang1900/spark,tejasapatil/spark,nilsgrabbert/spark,lxsmnv/spark,cin/spark,facaiy/spark,ericvandenbergfb/spark,markhamstra/spark,nlalevee/spark,gengliangwang/spark,shaneknapp/spark,nlalevee/spark,sachintyagi22/spark,bdrillard/spark,nchammas/spark,pgandhi999/spark,kevinyu98/spark,xuanyuanking/spark,map222/spark,HyukjinKwon/spark,zzcclp/spark,esi-mineset/spark,metamx/spark,vax11780/spark,debugger87/spark,WindCanDie/spark,bOOm-X/spark,ConeyLiu/spark,dongjoon-hyun/spark,mzl9039/spark,jiangxb1987/spark,jlopezmalla/spark,markhamstra/spark,publicRoman/spark,jlopezmalla/spark,tengpeng/spark,someorz/spark,aosagie/spark,metamx/spark,rezasafi/spark,UndeadBaneGitHub/spark,map222/spark,SHASHANKB/spark,byakuinss/spark,shubhamchopra/spark,WindCanDie/spark,joseph-torres/spark,zhouyejoe/spark,janewangfb/spark,JoshRosen/spark,spark-test/spark,debugger87/spark,liyichao/spark,apache-spark-on-k8s/spark,big-pegasus/spark,kimoonkim/spark,highfei2011/spark,ioana-delaney/spark,kissmetrics/spark,maropu/spark,byakuinss/spark,liyichao/spark,ibm-research-ireland/sparkoscope,haowu80s/spark,mkolod/incubator-spark,hhbyyh/spark,saturday-shi/spark,huang1900/spark,hhbyyh/spark,adrian-ionescu/apache-spark,sryza/spark,BryanCutler/spark,aray/spark,ericvandenbergfb/spark,rekhajoshm/spark,dbtsai/spark,wangmiao1981/spark,shuangshuangwang/spark,sryza/spark,spark-test/spark,kiszk/spark,eyalfa/spark,ahnqirage/spark,saturday-shi/spark,markhamstra/spark,facaiy/spark,ddna1021/spark,ajaysaini725/spark,eyalfa/spark,byakuinss/spark,dhruve/spark,goldmedal/spark,wangyum/spark,srowen/spark,icexelloss/spark,patrick-nicholson/spark,HyukjinKwon/spark,apache/spark,ConeyLiu/spark,tejasapatil/spark,lyogavin/spark,szhem/spark,stanzhai/spark,panfengfeng/spark,andrewor14/spark,saltstar/spark,szhem/spark,dhruve/spark,icexelloss/spark,kiszk/spark,ddna1021/spark,ueshin/apache-spark,gengliangwang/spark,facaiy/spark,metamx/spark,gioenn/xSpark,cin/spark,wangyum/spark,milliman/spark,darionyaphet/spark,JerryLead/spark,jkbradley/spark,mdespriee/spark,apache-spark-on-k8s/spark,kissmetrics/spark,zero323/spark,wangyum/spark,aray/spark,publicRoman/spark,spark-test/spark,shubhamchopra/spark,lyogavin/spark,rezasafi/spark,zero323/spark,xflin/spark,apache/spark,setjet/spark,dotunolafunmiloye/spark,bdrillard/spark,jrshust/spark,rekhajoshm/spark,yanboliang/spark,caneGuy/spark,tejasapatil/spark,akopich/spark,ueshin/apache-spark,shubhamchopra/spark,shaneknapp/spark,jkbradley/spark,michalsenkyr/spark,loneknightpy/spark,jiangxb1987/spark,jianran/spark,akopich/spark,mkolod/incubator-spark,sureshthalamati/spark,kiszk/spark,ddna1021/spark,Aegeaner/spark,metamx/spark,kimoonkim/spark,ueshin/apache-spark,huang1900/spark,markhamstra/spark,1haodian/spark,ericvandenbergfb/spark,kimoonkim/spark,rezasafi/spark,ajaysaini725/spark,ueshin/apache-spark,alunarbeach/spark,mahak/spark,bravo-zhang/spark,xuanyuanking/spark,sachintyagi22/spark,zhouyejoe/spark,gengliangwang/spark,MLnick/spark,andrewor14/spark,koeninger/spark,hhbyyh/spark,dhruve/spark,ron8hu/spark,ptkool/spark,shuangshuangwang/spark,icexelloss/spark,gengliangwang/spark,ron8hu/spark,setjet/spark,minixalpha/spark,MLnick/spark,xuanyuanking/spark,HyukjinKwon/spark,publicRoman/spark,kevinyu98/spark,caneGuy/spark,vax11780/spark,Aegeaner/spark,ibm-research-ireland/sparkoscope,mike0sv/spark,jrshust/spark,srowen/spark,guoxiaolongzte/spark,panfengfeng/spark,actuaryzhang/spark,cin/spark,zero323/spark,yanboliang/spark,jianran/spark,yanboliang/spark,SnappyDataInc/spark,mdespriee/spark,BryanCutler/spark,ptkool/spark,vinodkc/spark,actuaryzhang/spark,facaiy/spark,zuotingbing/spark,gengliangwang/spark,nchammas/spark,adrian-ionescu/apache-spark,andrewor14/iolap,wangyum/spark,dbtsai/spark,brad-kaiser/spark,gengliangwang/spark,ron8hu/spark,ron8hu/spark,bOOm-X/spark,setjet/spark,techaddict/spark,zhouyejoe/spark,liyichao/spark,wgpshashank/spark,Panos-Bletsos/spark-cost-model-optimizer,holde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