Update MemSet comments.
Update MemSet comments.

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