Re: exposing more parse was: Re: tsearch2: setting weights on tsquery

Ivan Sergio Borgonovo <mail@webthatworks.it> writes:
> I missed it. Thanks. Nearly perfect. Now I've to understand what a
> {} is.
> An array with a null element? an empty array? an array containing ''?

Hmm ... it appears that ts_lexize is returning a one-dimensional array of
no elements, whereas '{}'::text[] returns a zero-dimensional array;
as does array[]::text[] so you can't easily get around it :-(

We probably ought to clean this up...

In the meantime it looks like you could check for
"array_upper(lexemes,1) > 0".

            regards, tom lane