Add test for multi-character char().
Add test for multi-character char().

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