Update discussion of floating-point problems in regression tests.
Update discussion of floating-point problems in regression tests.

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