Fix a coversation error with pre 6.4 versions.
Fix a coversation error with pre 6.4 versions.

Hiroshi Inoue

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