Ensure consistent results when FormSortKeys fails to find all the expected keys (it was returning uninitialized memory).
Ensure consistent results when FormSortKeys fails to find
all the expected keys (it was returning uninitialized memory).

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