Re: Add RANGE with values and exclusions clauses to the Window Functions

Oliver Ford <ojford(at)gmail(dot)com> writes:
> On Sat, Jan 27, 2018 at 7:40 AM, Erik Rijkers <er(at)xs4all(dot)nl> wrote:
>> Regression tests only succeed for assert-disabled compiles; they fail when
>> assert-enabled:

> Problem seems to be with an existing Assert in catcache.c:1545:
> Assert(nkeys > 0 && nkeys < cache->cc_nkeys);
> The "<" needs to be "<=" (and is changed in the attached patch).

No, that Assert is correct, because it's in SearchCatCacheList.
It doesn't make any sense to use SearchCatCacheList for a lookup
that specifies all of the key columns, because then you necessarily
have at most one match; you might as well use regular SearchCatCache,
which is significantly more efficient.

> AFAICT this was never a problem before purely because no code before
> this patch called SearchSysCacheList4, so they always called with
> fewer keys than the number available.

Hm, probably we shouldn't even have that macro.

regards, tom lane