New mdtruncate() func for single segment relations (< 2Gb).
New mdtruncate() func for single segment relations (< 2Gb).

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