Make `optimizer_parallel_union` visible [#135798407]
Make `optimizer_parallel_union` visible [#135798407]

Quikling/gpdb,adam8157/gpdb,adam8157/gpdb,ashwinstar/gpdb,janebeckman/gpdb,rvs/gpdb,lintzc/gpdb,kaknikhil/gpdb,janebeckman/gpdb,edespino/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,janebeckman/gpdb,adam8157/gpdb,edespino/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,adam8157/gpdb,cjcjameson/gpdb,lisakowen/gpdb,lisakowen/gpdb,lintzc/gpdb,Chibin/gpdb,greenplum-db/gpdb,edespino/gpdb,kaknikhil/gpdb,xinzweb/gpdb,Chibin/gpdb,Quikling/gpdb,xinzweb/gpdb,ashwinstar/gpdb,Chibin/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,Quikling/gpdb,janebeckman/gpdb,rvs/gpdb,lintzc/gpdb,jmcatamney/gpdb,50wu/gpdb,50wu/gpdb,lintzc/gpdb,janebeckman/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,lintzc/gpdb,50wu/gpdb,greenplum-db/gpdb,rvs/gpdb,Chibin/gpdb,lintzc/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,Chibin/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,Chibin/gpdb,greenplum-db/gpdb,Quikling/gpdb,Quikling/gpdb,edespino/gpdb,edespino/gpdb,adam8157/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,50wu/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,Chibin/gpdb,janebeckman/gpdb,lisakowen/gpdb,rvs/gpdb,jmcatamney/gpdb,lintzc/gpdb,edespino/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,rvs/gpdb,xinzweb/gpdb,xinzweb/gpdb,lisakowen/gpdb,cjcjameson/gpdb,Chibin/gpdb,edespino/gpdb,adam8157/gpdb,xinzweb/gpdb,yuanzhao/gpdb,rvs/gpdb,edespino/gpdb,lisakowen/gpdb,cjcjameson/gpdb,janebeckman/gpdb,rvs/gpdb,Quikling/gpdb,Chibin/gpdb,rvs/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,50wu/gpdb,janebeckman/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,xinzweb/gpdb,cjcjameson/gpdb,edespino/gpdb,rvs/gpdb,kaknikhil/gpdb,Chibin/gpdb,Quikling/gpdb,ashwinstar/gpdb,janebeckman/gpdb,kaknikhil/gpdb,50wu/gpdb,lintzc/gpdb,edespino/gpdb,janebeckman/gpdb,cjcjameson/gpdb,adam8157/gpdb,lisakowen/gpdb,yuanzhao/gpdb,lintzc/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,xinzweb/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,lisakowen/gpdb,lisakowen/gpdb,adam8157/gpdb,jmcatamney/gpdb,50wu/gpdb,kaknikhil/gpdb,rvs/gpdb,xinzweb/gpdb,Quikling/gpdb,50wu/gpdb,jmcatamney/gpdb,Quikling/gpdb,Quikling/gpdb