Small code cleanup for recent UPDATE SET (values) patch.
Small code cleanup for recent UPDATE SET (values) patch.

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