Re: tsvector/tsearch equality and/or portability issue

Phil Frost <indigo(at)bitglue(dot)com> writes:
> Things still seem to be broken for me. Among other things, the script at
> <http://unununium.org/~indigo/testvectors.sql.bz2> fails. It performs two
> tests, comparing 1000 random vectors with positions and random weights, and
> comparing the same vectors, but stripped. Oddly, the unstripped comparisons all
> pass, which is not consistant with what I am seeing in my database. However,
> I'm yet unable to reproduce those problems.

It looks to me like tsvector comparison may be too strong. The strip()
function evidently thinks that it's OK to rearrange the string chunks
into the same order as the WordEntry items, which suggests to me that
the "pos" fields are not really semantically significant. But
silly_cmp_tsvector() considers that a difference in pos values is
important. I don't understand the data structure well enough to know
which one to believe, but something's not consistent here.

regards, tom lane