Fix bug in propagating ALTER TABLE actions to typed tables.
Fix bug in propagating ALTER TABLE actions to typed tables.

We need to propagate such actions to all typed table children of a
given type, not just the first one.

Noah Misch

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