Fix for EXISTS.
Fix for EXISTS.

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