Re: BUG #4562: ts_headline() adds space when parsing url

On Wed, 14 Jan 2009, Bruce Momjian wrote:

>
> This bug still exists in my testing.

We fixed all issues with ts_headline and will submit soon.

>
> ---------------------------------------------------------------------------
>
> Tom Lane wrote:
>> "Denis Monsieur" <dmonsieur@gmail.com> writes:
>>> The problem is a space being added to text in the form of
>>> http://some.url/path
>>> Compare the output:
>>
>>> shs=# SELECT ts_headline('http://some.url', to_tsquery('sometext'));
>>>    ts_headline
>>> -----------------
>>>  http://some.url
>>> (1 row)
>>
>>> shs=# SELECT ts_headline('http://some.url/path', to_tsquery('sometext'));
>>>       ts_headline
>>> -----------------------
>>>  http:// some.url/path
>>> (1 row)
>>
>> I looked into this, and it seems that the problem is that
>> generateHeadline() emits a space for any token marked as replace = 1.
>> I think it probably shouldn't emit anything at all.  AFAICS the cases
>> where replace will get set are token types URL, TAG, NUMHWORD,
>> ASCIIHWORD, HWORD.  For URL and the HWORD variants the space is
>> certainly undesirable, because these token types are just respecifying
>> text that is also covered by their component tokens.  The only case
>> where you could make an argument that the space is useful is TAG,
>> as in
>>
>> regression=# SELECT ts_headline('http<foo>blah', to_tsquery('sometext'));
>>  ts_headline
>> -------------
>>  http blah
>> (1 row)
>>
>> But it seems to me to be at least as plausible that you should get
>> nothing as that you should get a space for a removed tag.
>>
>> Comments?
>>
>>             regards, tom lane
>>
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>
>

     Regards,
         Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83