Cursors with prefixes

[os12]

I've just hit an issue when iterating over records using a prefix. The issue comes up when keys have the following structure:

for (....)
    sprintf(buffer, "log:%08x:%08x:record%u", i, i, i);
    sp_setstring(o, "key", buffer, strlen(buffer)

I've just reduced the issue to a minimal test and will open a PR.

Dmitry, could you take a look please? What am I missing?

[os12]

Please see d0a5bfb - I got a repro with the existing test.

[coleifer]

Presumably the database needs to jump to the last key before it begins iteration, and this isn't happening when it encounters a prefix (?).