Remove some redundant tests and improve comments in next_token(). Cosmetic, but it might make this a bit less confusing to the next reader.
Remove some redundant tests and improve comments in next_token().
Cosmetic, but it might make this a bit less confusing to the next reader.

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