Revert gincostestimate changes.
Revert gincostestimate changes.

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