Optimizer cleanups.
Optimizer cleanups.

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