Fix confusion about -f switch: it's output not input.
Fix confusion about -f switch: it's output not input.

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