This is B-Tree implementation using GiST for int2, int4, int8, float4, float8
timestamp with/without time zone, time with/without time zone, date,
interval, oid, money and macaddr types.

This extension is useful for creating multicolumn GiST indices,
for example, creating index on tsvector (contrib/tsearch2) and timestamp.

All work was done by Teodor Sigaev (teodor@stack.net) , Oleg Bartunov
(oleg@sai.msu.su), Janko Richter (jankorichter@yahoo.de).
See http://www.sai.msu.su/~megera/postgres/gist for additional
information.

NEWS:
     Jan 10, 2004 - btree_gist now support oid , timestamp with time zone ,
                    time with and without time zone, date , interval
                    money, macaddr

     Feb  5, 2003 - btree_gist now support int2, int8, float4, float8
     
NOTICE:
     This version will works only with postgresql version 7.3 and above
     because of changes in interface of function calling and in system
     tables.

INSTALLATION:

  gmake
  gmake install
  -- load functions
  psql <database> < btree_gist.sql

REGRESSION TEST:

   gmake installcheck

EXAMPLE USAGE:

   create table test (a int4);
   -- create index
   create index testidx on test using gist (a);
   -- query
   select * from test where a < 10;