Fix psql's \dD to show only one row per domain, even when the domain has multiple check constraints.
Fix psql's \dD to show only one row per domain, even when the domain has
multiple check constraints.

arcivanov/postgres-xl,pavanvd/postgres-xl,ashwinstar/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,xinzweb/gpdb,tpostgres-projects/tPostgres,jmcatamney/gpdb,oberstet/postgres-xl,yazun/postgres-xl,edespino/gpdb,snaga/postgres-xl,Postgres-XL/Postgres-XL,lisakowen/gpdb,ashwinstar/gpdb,techdragon/Postgres-XL,ashwinstar/gpdb,kmjungersen/PostgresXL,lisakowen/gpdb,ashwinstar/gpdb,adam8157/gpdb,greenplum-db/gpdb,edespino/gpdb,greenplum-db/gpdb,Chibin/gpdb,Chibin/gpdb,Chibin/gpdb,lisakowen/gpdb,kmjungersen/PostgresXL,Chibin/gpdb,edespino/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,zeroae/postgres-xl,snaga/postgres-xl,yazun/postgres-xl,lisakowen/gpdb,edespino/gpdb,techdragon/Postgres-XL,adam8157/gpdb,50wu/gpdb,yazun/postgres-xl,kmjungersen/PostgresXL,greenplum-db/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,ovr/postgres-xl,adam8157/gpdb,Chibin/gpdb,jmcatamney/gpdb,kmjungersen/PostgresXL,techdragon/Postgres-XL,yuanzhao/gpdb,oberstet/postgres-xl,edespino/gpdb,yuanzhao/gpdb,ovr/postgres-xl,greenplum-db/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,jmcatamney/gpdb,yazun/postgres-xl,lisakowen/gpdb,50wu/gpdb,greenplum-db/gpdb,snaga/postgres-xl,ovr/postgres-xl,arcivanov/postgres-xl,arcivanov/postgres-xl,50wu/gpdb,pavanvd/postgres-xl,arcivanov/postgres-xl,adam8157/gpdb,xinzweb/gpdb,ovr/postgres-xl,postmind-net/postgres-xl,xinzweb/gpdb,Chibin/gpdb,yuanzhao/gpdb,adam8157/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,yazun/postgres-xl,edespino/gpdb,pavanvd/postgres-xl,edespino/gpdb,Postgres-XL/Postgres-XL,yuanzhao/gpdb,pavanvd/postgres-xl,tpostgres-projects/tPostgres,adam8157/gpdb,Chibin/gpdb,kmjungersen/PostgresXL,adam8157/gpdb,techdragon/Postgres-XL,oberstet/postgres-xl,edespino/gpdb,xinzweb/gpdb,yuanzhao/gpdb,Chibin/gpdb,xinzweb/gpdb,50wu/gpdb,postmind-net/postgres-xl,arcivanov/postgres-xl,zeroae/postgres-xl,adam8157/gpdb,zeroae/postgres-xl,Chibin/gpdb,xinzweb/gpdb,yuanzhao/gpdb,tpostgres-projects/tPostgres,Postgres-XL/Postgres-XL,jmcatamney/gpdb,50wu/gpdb,edespino/gpdb,greenplum-db/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,lisakowen/gpdb,zeroae/postgres-xl,ashwinstar/gpdb,lisakowen/gpdb,arcivanov/postgres-xl,tpostgres-projects/tPostgres,postmind-net/postgres-xl,yuanzhao/gpdb,greenplum-db/gpdb,50wu/gpdb,oberstet/postgres-xl,snaga/postgres-xl,xinzweb/gpdb,lisakowen/gpdb,edespino/gpdb,xinzweb/gpdb,ovr/postgres-xl,ashwinstar/gpdb,greenplum-db/gpdb,snaga/postgres-xl,50wu/gpdb,postmind-net/postgres-xl,oberstet/postgres-xl,Chibin/gpdb,postmind-net/postgres-xl,tpostgres-projects/tPostgres