some clarifications inspired by the DocNotes
some clarifications inspired by the DocNotes

edespino/gpdb,greenplum-db/gpdb,royc1/gpdb,cjcjameson/gpdb,zaksoup/gpdb,kaknikhil/gpdb,kmjungersen/PostgresXL,ashwinstar/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,xuegang/gpdb,adam8157/gpdb,edespino/gpdb,snaga/postgres-xl,zaksoup/gpdb,rvs/gpdb,tpostgres-projects/tPostgres,jmcatamney/gpdb,snaga/postgres-xl,lpetrov-pivotal/gpdb,lisakowen/gpdb,janebeckman/gpdb,kmjungersen/PostgresXL,foyzur/gpdb,Chibin/gpdb,0x0FFF/gpdb,randomtask1155/gpdb,0x0FFF/gpdb,randomtask1155/gpdb,kaknikhil/gpdb,randomtask1155/gpdb,zeroae/postgres-xl,arcivanov/postgres-xl,jmcatamney/gpdb,Chibin/gpdb,lisakowen/gpdb,edespino/gpdb,tangp3/gpdb,janebeckman/gpdb,edespino/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,foyzur/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,zaksoup/gpdb,oberstet/postgres-xl,ahachete/gpdb,foyzur/gpdb,lisakowen/gpdb,xinzweb/gpdb,Quikling/gpdb,CraigHarris/gpdb,foyzur/gpdb,50wu/gpdb,rvs/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,Quikling/gpdb,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,Quikling/gpdb,50wu/gpdb,Quikling/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,adam8157/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,ahachete/gpdb,rvs/gpdb,arcivanov/postgres-xl,0x0FFF/gpdb,rvs/gpdb,yazun/postgres-xl,yazun/postgres-xl,50wu/gpdb,yuanzhao/gpdb,lisakowen/gpdb,CraigHarris/gpdb,xuegang/gpdb,rubikloud/gpdb,royc1/gpdb,Postgres-XL/Postgres-XL,arcivanov/postgres-xl,rvs/gpdb,xinzweb/gpdb,Chibin/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,foyzur/gpdb,chrishajas/gpdb,Chibin/gpdb,chrishajas/gpdb,rvs/gpdb,50wu/gpdb,kaknikhil/gpdb,ovr/postgres-xl,ashwinstar/gpdb,oberstet/postgres-xl,janebeckman/gpdb,zaksoup/gpdb,CraigHarris/gpdb,lintzc/gpdb,tangp3/gpdb,randomtask1155/gpdb,edespino/gpdb,postmind-net/postgres-xl,ahachete/gpdb,jmcatamney/gpdb,adam8157/gpdb,techdragon/Postgres-XL,janebeckman/gpdb,ovr/postgres-xl,tpostgres-projects/tPostgres,CraigHarris/gpdb,xuegang/gpdb,royc1/gpdb,Chibin/gpdb,adam8157/gpdb,ahachete/gpdb,ahachete/gpdb,chrishajas/gpdb,techdragon/Postgres-XL,randomtask1155/gpdb,zeroae/postgres-xl,ahachete/gpdb,lintzc/gpdb,cjcjameson/gpdb,rvs/gpdb,rubikloud/gpdb,Chibin/gpdb,janebeckman/gpdb,lintzc/gpdb,rvs/gpdb,lpetrov-pivotal/gpdb,xuegang/gpdb,kmjungersen/PostgresXL,yuanzhao/gpdb,janebeckman/gpdb,foyzur/gpdb,ahachete/gpdb,zaksoup/gpdb,arcivanov/postgres-xl,tangp3/gpdb,0x0FFF/gpdb,janebeckman/gpdb,CraigHarris/gpdb,xuegang/gpdb,edespino/gpdb,lpetrov-pivotal/gpdb,zeroae/postgres-xl,janebeckman/gpdb,0x0FFF/gpdb,lpetrov-pivotal/gpdb,pavanvd/postgres-xl,kaknikhil/gpdb,yuanzhao/gpdb,adam8157/gpdb,ovr/postgres-xl,50wu/gpdb,greenplum-db/gpdb,edespino/gpdb,xinzweb/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,yazun/postgres-xl,ovr/postgres-xl,cjcjameson/gpdb,0x0FFF/gpdb,adam8157/gpdb,janebeckman/gpdb,edespino/gpdb,chrishajas/gpdb,ashwinstar/gpdb,Quikling/gpdb,techdragon/Postgres-XL,atris/gpdb,xuegang/gpdb,snaga/postgres-xl,atris/gpdb,Quikling/gpdb,adam8157/gpdb,kaknikhil/gpdb,rubikloud/gpdb,Postgres-XL/Postgres-XL,postmind-net/postgres-xl,edespino/gpdb,Quikling/gpdb,Postgres-XL/Postgres-XL,rubikloud/gpdb,adam8157/gpdb,randomtask1155/gpdb,greenplum-db/gpdb,xinzweb/gpdb,janebeckman/gpdb,ahachete/gpdb,lintzc/gpdb,techdragon/Postgres-XL,lpetrov-pivotal/gpdb,xinzweb/gpdb,yuanzhao/gpdb,chrishajas/gpdb,rubikloud/gpdb,cjcjameson/gpdb,atris/gpdb,CraigHarris/gpdb,chrishajas/gpdb,oberstet/postgres-xl,royc1/gpdb,xuegang/gpdb,Quikling/gpdb,Chibin/gpdb,rubikloud/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,kaknikhil/gpdb,tpostgres-projects/tPostgres,CraigHarris/gpdb,50wu/gpdb,postmind-net/postgres-xl,jmcatamney/gpdb,foyzur/gpdb,royc1/gpdb,Chibin/gpdb,lisakowen/gpdb,cjcjameson/gpdb,royc1/gpdb,zaksoup/gpdb,cjcjameson/gpdb,chrishajas/gpdb,xinzweb/gpdb,arcivanov/postgres-xl,foyzur/gpdb,xuegang/gpdb,xinzweb/gpdb,tangp3/gpdb,Chibin/gpdb,greenplum-db/gpdb,tpostgres-projects/tPostgres,lintzc/gpdb,pavanvd/postgres-xl,jmcatamney/gpdb,oberstet/postgres-xl,kaknikhil/gpdb,pavanvd/postgres-xl,royc1/gpdb,randomtask1155/gpdb,kmjungersen/PostgresXL,ashwinstar/gpdb,0x0FFF/gpdb,rvs/gpdb,zeroae/postgres-xl,jmcatamney/gpdb,royc1/gpdb,ovr/postgres-xl,atris/gpdb,tangp3/gpdb,chrishajas/gpdb,zaksoup/gpdb,tangp3/gpdb,atris/gpdb,Chibin/gpdb,yuanzhao/gpdb,snaga/postgres-xl,cjcjameson/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,yazun/postgres-xl,kmjungersen/PostgresXL,lintzc/gpdb,rvs/gpdb,lpetrov-pivotal/gpdb,Quikling/gpdb,atris/gpdb,techdragon/Postgres-XL,greenplum-db/gpdb,50wu/gpdb,lisakowen/gpdb,greenplum-db/gpdb,lintzc/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,randomtask1155/gpdb,lintzc/gpdb,arcivanov/postgres-xl,tpostgres-projects/tPostgres,zaksoup/gpdb,atris/gpdb,yuanzhao/gpdb,Quikling/gpdb,tangp3/gpdb,atris/gpdb,edespino/gpdb,yazun/postgres-xl,xuegang/gpdb,lintzc/gpdb,pavanvd/postgres-xl,snaga/postgres-xl,ashwinstar/gpdb,50wu/gpdb,oberstet/postgres-xl,rubikloud/gpdb,tangp3/gpdb,kaknikhil/gpdb,lpetrov-pivotal/gpdb,lpetrov-pivotal/gpdb,yuanzhao/gpdb,rubikloud/gpdb,lisakowen/gpdb