Bug #689: Bug at moving cursor on joined tables

Robert Grabowski (robert.grabowski@7bulls.com) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
Bug at moving cursor on joined tables

Long Description
I have problems with moving cursors on joined tables. On Simple tables all is ok... See example code...

Sample Code
test=# create table t1 (id integer, name text);
CREATE
test=# create table t2 (id integer, name text);
CREATE
test=# insert into t1 values (1, 'a');
INSERT 3670086 1
test=# insert into t1 values (2, 'b');
INSERT 3670087 1
test=# insert into t1 values (3, 'd');
INSERT 3670088 1
test=# insert into t2 values (1, 'x');
INSERT 3670089 1
test=# insert into t2 values (2, 'y');
INSERT 3670090 1
test=# insert into t2 values (3, 'z');
INSERT 3670091 1
test=# begin;
BEGIN
test=# declare c cursor for select t1.id, t1.name, t2.name from t1 join t2 using (id);
DECLARE
test=# fetch all from c;
 id | name | name
----+------+------
  1 | a    | x
  2 | b    | y
  3 | d    | z
(3 rows)

test=# move backward all in c;
MOVE 0
test=# fetch all from c;
 id | name | name
----+------+------
(0 rows)

test=# rollback;
ROLLBACK
test=# begin;
BEGIN
test=# declare c cursor for select t1.id, t1.name from t1;
DECLARE
test=# fetch all from c;
 id | name
----+------
  1 | a
  2 | b
  3 | d
(3 rows)

test=# move backward all in c;
MOVE 3
test=# fetch all from c;
 id | name
----+------
  1 | a
  2 | b
  3 | d
(3 rows)

test=#


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