Update discussion of aggregate syntax to mention ALL.
Update discussion of aggregate syntax to mention ALL.

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