Don't choke when exec_move_row assigns a synthesized null to a column that happens to be composite itself.  Per bug #5314 from Oleg Serov.
Don't choke when exec_move_row assigns a synthesized null to a column
that happens to be composite itself.  Per bug #5314 from Oleg Serov.

Backpatch to 8.0 --- 7.4 has got too many other shortcomings in
composite-type support to make this worth worrying about in that branch.

janebeckman/gpdb,rvs/gpdb,janebeckman/gpdb,royc1/gpdb,cjcjameson/gpdb,50wu/gpdb,chrishajas/gpdb,zaksoup/gpdb,janebeckman/gpdb,zaksoup/gpdb,lisakowen/gpdb,Quikling/gpdb,rvs/gpdb,lisakowen/gpdb,50wu/gpdb,jmcatamney/gpdb,ahachete/gpdb,adam8157/gpdb,xuegang/gpdb,lintzc/gpdb,kaknikhil/gpdb,edespino/gpdb,0x0FFF/gpdb,xinzweb/gpdb,Chibin/gpdb,0x0FFF/gpdb,ashwinstar/gpdb,ahachete/gpdb,rvs/gpdb,janebeckman/gpdb,edespino/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,chrishajas/gpdb,xuegang/gpdb,lintzc/gpdb,ashwinstar/gpdb,Quikling/gpdb,adam8157/gpdb,Quikling/gpdb,edespino/gpdb,xuegang/gpdb,Quikling/gpdb,zaksoup/gpdb,greenplum-db/gpdb,ahachete/gpdb,royc1/gpdb,janebeckman/gpdb,edespino/gpdb,CraigHarris/gpdb,xuegang/gpdb,adam8157/gpdb,kaknikhil/gpdb,CraigHarris/gpdb,lintzc/gpdb,xuegang/gpdb,0x0FFF/gpdb,rvs/gpdb,yuanzhao/gpdb,royc1/gpdb,cjcjameson/gpdb,lintzc/gpdb,ahachete/gpdb,rvs/gpdb,greenplum-db/gpdb,rvs/gpdb,50wu/gpdb,greenplum-db/gpdb,edespino/gpdb,ahachete/gpdb,CraigHarris/gpdb,royc1/gpdb,yuanzhao/gpdb,adam8157/gpdb,ashwinstar/gpdb,xinzweb/gpdb,Quikling/gpdb,xuegang/gpdb,xinzweb/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,lisakowen/gpdb,kaknikhil/gpdb,royc1/gpdb,lintzc/gpdb,ahachete/gpdb,royc1/gpdb,kaknikhil/gpdb,CraigHarris/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,rvs/gpdb,0x0FFF/gpdb,zaksoup/gpdb,chrishajas/gpdb,jmcatamney/gpdb,kaknikhil/gpdb,lintzc/gpdb,Chibin/gpdb,CraigHarris/gpdb,xinzweb/gpdb,ashwinstar/gpdb,chrishajas/gpdb,0x0FFF/gpdb,0x0FFF/gpdb,Quikling/gpdb,xuegang/gpdb,janebeckman/gpdb,chrishajas/gpdb,ashwinstar/gpdb,edespino/gpdb,ahachete/gpdb,zaksoup/gpdb,edespino/gpdb,xinzweb/gpdb,jmcatamney/gpdb,50wu/gpdb,lisakowen/gpdb,Chibin/gpdb,Chibin/gpdb,chrishajas/gpdb,adam8157/gpdb,Quikling/gpdb,rvs/gpdb,xuegang/gpdb,zaksoup/gpdb,CraigHarris/gpdb,chrishajas/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,50wu/gpdb,lintzc/gpdb,janebeckman/gpdb,kaknikhil/gpdb,adam8157/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,adam8157/gpdb,Quikling/gpdb,xuegang/gpdb,kaknikhil/gpdb,lisakowen/gpdb,rvs/gpdb,edespino/gpdb,xinzweb/gpdb,Chibin/gpdb,adam8157/gpdb,Chibin/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,Chibin/gpdb,0x0FFF/gpdb,janebeckman/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,xinzweb/gpdb,yuanzhao/gpdb,lintzc/gpdb,zaksoup/gpdb,ahachete/gpdb,jmcatamney/gpdb,Quikling/gpdb,janebeckman/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,edespino/gpdb,kaknikhil/gpdb,chrishajas/gpdb,ashwinstar/gpdb,Chibin/gpdb,50wu/gpdb,0x0FFF/gpdb,yuanzhao/gpdb,Chibin/gpdb,50wu/gpdb,edespino/gpdb,xinzweb/gpdb,lisakowen/gpdb,50wu/gpdb,janebeckman/gpdb,rvs/gpdb,zaksoup/gpdb,royc1/gpdb,Chibin/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,lisakowen/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,lintzc/gpdb,Quikling/gpdb,lisakowen/gpdb,royc1/gpdb