Add:
Add:

> * Improve performance for queries with many columns

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