BETWEEN SYMMETRIC/ASYMMETRIC

Hi all,

I've attached a patch for doing BETWEEN SYM/ASYM, however it just doesn't
work!!!

test=# select 2 between 1 and 3;
 ?column?
----------
 t
(1 row)

test=# select 2 between 3 and 1;
 ?column?
----------
 f
(1 row)

test=# select 2 between symmetric 3 and 1;
ERROR:  parser: parse error at or near "3"
test=# select 2 between asymmetric 3 and 1;
ERROR:  parser: parse error at or near "3"
test=# select 2 not between  3 and 1;
 ?column?
----------
 t
(1 row)

test=# select 2 not between symmetric 3 and 1;
ERROR:  parser: parse error at or near "3"

Can anyone see what's wrong?

Chris