Add mapPartitions(), glom(), countByValue() to Python API.
Add mapPartitions(), glom(), countByValue() to Python API.

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