Rejigger do_lo_list's query so that obj_description() is evaluated only once per distinct LO, not once per pg_largeobject tuple.
Rejigger do_lo_list's query so that obj_description() is evaluated only
once per distinct LO, not once per pg_largeobject tuple.

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