Further cleanup in _bt_first: eliminate duplicate code paths.
Further cleanup in _bt_first: eliminate duplicate code paths.

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