Block FULL JOIN expressions
Block FULL JOIN expressions

This was leading to issues in join tests in XC planner like bug 3277038.
It was not noticed before because this test has problems with relation "t1",
which is created in test create_view but not removed correctly.

snaga/postgres-xl,ovr/postgres-xl,Postgres-XL/Postgres-XL,arcivanov/postgres-xl,zeroae/postgres-xl,techdragon/Postgres-XL,techdragon/Postgres-XL,arcivanov/postgres-xl,yazun/postgres-xl,zeroae/postgres-xl,Postgres-XL/Postgres-XL,zeroae/postgres-xl,arcivanov/postgres-xl,Postgres-XL/Postgres-XL,postmind-net/postgres-xl,pavanvd/postgres-xl,snaga/postgres-xl,snaga/postgres-xl,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,arcivanov/postgres-xl,arcivanov/postgres-xl,snaga/postgres-xl,kmjungersen/PostgresXL,kmjungersen/PostgresXL,ovr/postgres-xl,techdragon/Postgres-XL,ovr/postgres-xl,yazun/postgres-xl,snaga/postgres-xl,yazun/postgres-xl,ovr/postgres-xl,kmjungersen/PostgresXL,oberstet/postgres-xl,pavanvd/postgres-xl,techdragon/Postgres-XL,pavanvd/postgres-xl,kmjungersen/PostgresXL,yazun/postgres-xl,zeroae/postgres-xl,Postgres-XL/Postgres-XL,oberstet/postgres-xl,arcivanov/postgres-xl,pavanvd/postgres-xl,oberstet/postgres-xl,oberstet/postgres-xl,zeroae/postgres-xl,postmind-net/postgres-xl,postmind-net/postgres-xl,yazun/postgres-xl,techdragon/Postgres-XL,kmjungersen/PostgresXL,oberstet/postgres-xl,pavanvd/postgres-xl,postmind-net/postgres-xl,ovr/postgres-xl