I wrote:
> "Kurt Harriman" <[EMAIL PROTECTED]> writes:
>> Just noticed buffile.c:292 doesn't look quite right where
>> BufFileDumpBuffer calls FileWrite:
>> bytestowrite = FileWrite(thisfile, file->buffer, bytestowrite);
>> It looks as though it would write the same data each time the
>> loop is iterated. Would this be better?
>> bytestowrite = FileWrite(thisfile, file->buffer + wpos, bytestowrite);
> Yeah, I think you're right.
FYI, I was able to exercise the bug by changing RELSEG_SIZE to 2 within
buffile.c and then running this script in the regression database:
set work_mem = '64kB';
begin;
declare c scroll cursor for select * from tenk1 a join tenk1 b using(two);
fetch 1 from c;
fetch 100 from c;
fetch backward 10 from c;
fetch 100 from c;
fetch backward 10 from c;
fetch 100 from c;
fetch backward 100 from c;
commit;
It doesn't crash with the fix applied. Thanks for spotting it.
regards, tom lane
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
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