Document tri-valued variables in createdb, +1, -1, 0.
Document tri-valued variables in createdb, +1, -1, 0.

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