Add initial backend support for SET/SHOW/RESET TIME ZONE.  Uses TZ environment variable.  Needs additional schemes for brain-dead SQL92 time offsets.
Add initial backend support for SET/SHOW/RESET TIME ZONE.
 Uses TZ environment variable.
 Needs additional schemes for brain-dead SQL92 time offsets.

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