Update item description:
Update item description:

< * CREATE TABLE AS can not determine column lengths from expressions [atttypmod]
> * Allow CREATE TABLE AS to determine column lengths for complex
>   expressions like SELECT col1 || col2

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