Re: Allow GiST opcalsses without compress\decompres functions

Alexander Korotkov <a.korotkov@postgrespro.ru> writes:
> On Wed, Sep 20, 2017 at 4:25 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Yes.  We don't allow out-of-line values, but we do allow compressed and
>> short-header values.

> BTW, this comment looks still invalid for me...

>> #define SIGLENINT  4 /* >122 => key will *toast*, so very slow!!! */

I haven't done the math to see if 122 is exactly the right value,
but at some point index_form_tuple would decide that the tuple was
uncomfortably big and try to compress it.  So the comment is right
in general terms.

			regards, tom lane