Comment 3 for bug 1025357

Abel Deuring (adeuring) wrote :

I am not sure if this is really critical. After all, a slightly modified query will work.

And while I sketched a possible fix in previous comment, I am not sure if we should implement it or if we should simply keep the current behaviour: My impression about ftq() os that it tries to do too much DWIM anyway, and I'd prefer to make the function more simple and thus its behaviour better predictable.

A bad DWIM example: A '-' preceded by a space and preceding a word is converted into a '!', i.e., the term "-foo" is treated as "find texts that do not contain the word 'foo'". That's fine for words, but breaks utterly for numbers. The TS data for a simple calculation:

select to_tsvector('123-456');
   to_tsvector
------------------
 '-456':2 '123':1

"123-456" used as a search term:

select ftq('123-456');
      ftq
----------------
 '123' & '-456'

so there is no match because '456' != '-456':

select to_tsvector('123 - 456') @@ ftq('123-456');
 ?column?
----------
 f