Simplify and clean up FigureColname; make it work without coredumping for TypeCast case.
Simplify and clean up FigureColname; make it work without coredumping
for TypeCast case.

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