Why is there a limitation of 256 positions per lexeme in a tsvector?
There doesn't seem to be a technical reason for that. WordEntryPosVector
uses a uint16 to store the number of positions, so it go up to 65535.

For two reasons:
- Ranking might become very slow if number of position is big
- From practice: if word is very frequent on document then with high probability this is a stop word or (case of internet-wide search engines) document is a spam.

That's common practice of search engines to limit number of word's positions, because increasing it doesn't give advantage in term of ranking
and cause trouble from increasing of storage size.
Teodor Sigaev                                   E-mail: [EMAIL PROTECTED]
                                                   WWW: http://www.sigaev.ru/

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