Re: ToDo: KNN Search should to support DISTINCT clasuse?

"Kevin Grittner" <kgrittn(at)mail(dot)com> writes:
> Pavel Stehule wrote:
>> 2012/10/22 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>>> Perhaps it would be close enough to what you want to use DISTINCT ON:
>>> contrib_regression=# explain select distinct on( t <-> 'foo') *,t <-> 'foo' from test_trgm order by t <-> 'foo' limit 10;

>> good tip - it's working

> If two or more values happen to be at exactly the same distance,
> wouldn't you just get one of them?

Yeah, that is a hazard. I'm not sure whether <->'s results are
sufficiently quantized to make that a big problem in practice.

regards, tom lane