improve scaladoc
improve scaladoc

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