Why is ltree still in contrib? What prevents it from being in core?
Nothing. But I don't see any advantage of placing it in core - it changes nothing in SQL, API or feature. Moving tsearch2 into core allows to manage configuration with nice SQL API, using SysCache, automatical rereading dictionaries files etc.

IMHO, common problem for hstore/ltree/tsearch2 is a problem with public namespace is dump/restore. Users usually dump the whole db and restore it in new version. Even we make new version of contrib module with the same function, new function/feature will not be accessible.

Teodor Sigaev                                   E-mail: [EMAIL PROTECTED]
                                                   WWW: http://www.sigaev.ru/

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