On Sat, Oct 08, 2005 at 12:48:50PM +0530, sandeep satpal wrote: > The _bt_compare function in "nbtree.c" file calls "FunctionCall2" and it > passes two arguments , one is the scankey which we want to search on and > other key is on current b-tree node. > > My problem is I want to pass three parameter and the third argument will > be used for taking decision during comparision that whether I want > case-sensitive comparision or case-insensitive.
Well, if you want to pass a third argument, go ahead. Just make sure you update all the appropriate function calls. > But "initdb" also uses the same _bt_compare function for creating its own > indexes. > For eg. > when we write /usr/pgsql/bin/initdb -D /usr/local/data > And my modification may create problems. > How I solve this ?? Well, _bt_compare is used for every btree index in the system, including all the system indexes. A fresh initdb already has several dozen indexes already so your code has to deal with that. Remember, _bt_compare compares strings, integers, floats, dates, etc and your code needs to work for all of them too... What does it mean to compare dates case-insensetivly? Hope this helps, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a > tool for doing 5% of the work and then sitting around waiting for someone > else to do the other 95% so you can sue them.
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