Re: [SQL] bad select performance fixed by forbidding hash joins

Nik Putnam  writes:
> I tried this out to see if it would speed up *my* query too.
> The query went much faster, but gave different results!
> [nputnam@spinon ~]$ setenv PGOPTIONS "-fh"
> [nputnam@spinon ~]$ psql -e expression < query.sql
> gives 15 rows of output in 1s.
> [nputnam@spinon ~]$ unsetenv PGOPTIONS
> [nputnam@spinon ~]$ psql -e expression < query.sql
> gives 289 rows of output in 51s
> The slow one is giving the right answer.
> Why might they be different?

That would be a bug, without question.  Can you provide a repeatable
test case?
		regards, tom lane