Fix for  factorial(0::int2) returning 1, from  sugita@sra.co.jp.
Fix for  factorial(0::int2) returning 1, from  sugita@sra.co.jp.

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