Remove dead show_sort_info function.(closes #1788)
Remove dead show_sort_info function.(closes #1788)

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