Leonardo Francalanci <m_li...@yahoo.it> wrote: >>> another question regarding indexes. Sadly I can't find enough >>> info in the documentation. Which of the functions are needed in >>> order for a index to work? >> >> All of them. > > > Maybe I completely misunderstood the question, but some functions > are "optionals", such as amgetbitmap, right? > > http://www.postgresql.org/docs/9.0/static/index-functions.html Browsing that page, I think these are the two relevant bits regarding exceptions to the rule: | The amgettuple function need only be provided if the access method | supports "plain" index scans. If it doesn't, the amgettuple field | in its pg_am row must be set to zero. | The amgetbitmap function need only be provided if the access | method supports "bitmap" index scans. If it doesn't, the | amgetbitmap field in its pg_am row must be set to zero. I have no idea which of these would be useful for the AM being discussed. -Kevin
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