Update to describe new set of globally-known contexts planned for support of extended query features in new FE/BE protocol.  TransactionCommandContext is gone (PortalContext replaces it for some purposes), and QueryContext has taken on a new meaning (MessageContext plays its old role).
Update to describe new set of globally-known contexts planned for support
of extended query features in new FE/BE protocol.  TransactionCommandContext
is gone (PortalContext replaces it for some purposes), and QueryContext
has taken on a new meaning (MessageContext plays its old role).

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