Add a little to index operator class discussion.
Add a little to index operator class discussion.

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