Re: [BUGS] BUG #14515: tsquery with only a negative term doesn't match empty tsvector

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От Tom Lane
Тема Re: [BUGS] BUG #14515: tsquery with only a negative term doesn't match empty tsvector
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Msg-id 30721.1485401548@sss.pgh.pa.us
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Ответ на [BUGS] BUG #14515: tsquery with only a negative term doesn't match emptytsvector  (pgsql@tomd.cc)
Ответы Re: [BUGS] BUG #14515: tsquery with only a negative term doesn't match empty tsvector  (Tom Lane <tgl@sss.pgh.pa.us>)
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pgsql@tomd.cc writes:
> Basically while `select 'somethingelse'::tsvector @@ '!foo'::tsquery`
> returns true, `select ''::tsvector @@ '!foo'::tsquery` returns false, which
> was surprising to me.

Not sure about this.  A plausible reading of '!foo' is "there is a lexeme
that is not foo".  But even if that was Oleg & Teodor's intention,
I would not want to swear that the tsquery stuff is totally consistent
about it ...

            regards, tom lane


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