Implement TIMEZONE_HOUR, TIMEZONE_MINUTE per SQL92 specs. Check for and properly ignore FOREIGN KEY column constraints  (already had fixed same for table constraints). Define USER as synonym for CURRENT_USER per SQL92 specs  (no longer allowed as bare column name, sorry). Re-enable HAVING clause but no fixes elsewhere yet. Other stuff from today's update of gram.y...
Implement TIMEZONE_HOUR, TIMEZONE_MINUTE per SQL92 specs.
Check for and properly ignore FOREIGN KEY column constraints
 (already had fixed same for table constraints).
Define USER as synonym for CURRENT_USER per SQL92 specs
 (no longer allowed as bare column name, sorry).
Re-enable HAVING clause but no fixes elsewhere yet.
Other stuff from today's update of gram.y...

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