Add a usage example for has_function_privilege().
Add a usage example for has_function_privilege().

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