Fix for index problem that showed up in constraint test.
Fix for index problem that showed up in constraint test.

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