Do a better job of selecting candidates among functions  when no exact match. Clean up elog error messages.
Do a better job of selecting candidates among functions
 when no exact match.
Clean up elog error messages.

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