Done:
Done:

> * -Test hash index performance and discourage usage

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