Assertion failure on UNLOGGED VIEW and SEQUENCE

UNLOGGED is defigned in OptTemp in gram.y, so the parser accepts
CREATE UNLOGGED VIEW and CREATE UNLOGGED SEQUENCE, but they are
actually not supported.

=# CREATE UNLOGGED VIEW uv AS SELECT 1;
TRAP: FailedAssertion("!(relkind == 'r' || relkind == 't')", File:
"heap.c", Line: 1246)

=# CREATE UNLOGGED SEQUENCE us;
TRAP: FailedAssertion("!(relkind == 'r' || relkind == 't')", File:
"heap.c", Line: 1246)

The most easiest fix would be preventing them in parser level.

--
Itagaki Takahiro