def test_key_filter(self):
t = Table([
Record(x=1, y=2, z=3),
Record(x=2, y=2, z=3),
Record(x=1, y=2, z=4),
Record(x=2, y=1, z=3),
Record(x=1, y=2, z=3),
Record(x=3, y=3, z=4),
])
assert t.key_filter({'x': 1, 'z': 3}) == Table([
Record(x=1, y=2, z=3),
Record(x=1, y=2, z=3),
])
