Teodor Sigaev <teo...@sigaev.ru> writes:
>> Why does the phrase distance operator assume <1> means adjacent words,
>> and not <0>.  (FYI, <-> is the same as <1>.)

> Because
> 1 it is a result of subtruction of word's positions
> 2 <0> could be used as special case like a word with two infinitives:

This is actually documented, in 12.1.2:

        A special case that's sometimes useful is that <0> can be used to
        require that two patterns match the same word.

                        regards, tom lane

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