Artur Zajac (azajac@student.uci.agh.edu.pl) reports a bug with a severity of 3
The lower the number the more severe it is.
Short Description
Cursor scrolling
Long Description
There is some example in attachment. Sometimes after second fetch I had 0 rows (in other query). It seems that there is
abug in cursor scrolling or cursors doesn't let to move backward in some cases.
Sample Code
create table abc (a varchar(5),r int);
insert into abc VALUES ('FV','1');
insert into abc VALUES ('WZ','2');
insert into abc VALUES ('RW','3');
insert into abc VALUES ('PF','4');
select * from abc; ---- returns 4 rows
BEGIN;
DECLARE aaa CURSOR FOR SELECT DISTINCT ON (r) r,a FROM abc WHERE a!='';
FETCH ALL FROM aaa; ---- returns 4 rows
MOVE BACKWARD 26 IN aaa; --- returns MOVE 3 (why???)
FETCH ALL FROM aaa; ---- returns 3 rows
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