Pavel Stehule <pavel.stehule@gmail.com> writes:
> 2011/1/18 Tom Lane <tgl@sss.pgh.pa.us>:
>> I looked at this patch and found it fairly awkward. What is the point
>> of adding an additional flag to every variable, as opposed to just
>> forcibly detoasting during assignment?
> But detoasting on assignment isn't enought:
> for i in array_lower(a,1) .. array_upper(a,1)
> loop
> if x < a[i] then
> x = a[i];
> end if;
> end loop;
> in this cycle the variable a wasn't modified. Any access to this
> variable means a detoast and decompres.
How so? In what I'm envisioning, a would have been decompressed when it
was originally assigned to.
regards, tom lane