Back off previous patch to skip projection step in scan plan nodes, in the case where the node immediately above the scan is a Hash, Sort, or Material node.  In these cases it's better to do the projection so that we don't store unneeded columns in the hash/sort/materialize table.  Per discussion a few days ago with Anagh Lal.
Back off previous patch to skip projection step in scan plan nodes,
in the case where the node immediately above the scan is a Hash, Sort,
or Material node.  In these cases it's better to do the projection
so that we don't store unneeded columns in the hash/sort/materialize
table.  Per discussion a few days ago with Anagh Lal.

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