Hi,
I attached archive with contrib-intarray. Please submit it into
7.1 beta source tree.
Here is README
--------------------------------------------------------------
This is an implementation of RD-tree data structure using GiST interface
of PostgreSQL. It has built-in lossy compression - must be declared
in index creation - with (islossy). Current implementation has index support
for one-dimensional array of int4's.
All works was done by Teodor Sigaev (teodor@stack.net) and Oleg Bartunov
(oleg@sai.msu.su).
INSTALLATION:
gmake gmake install -- load functions psql <database> < _int.sql
EXAMPLE USAGE:
create table message (mid int not null,sections int[]); create table message_section_map (mid int not null,sid int not
null);
-- create indices
CREATE unique index message_key on message ( mid );
CREATE unique index message_section_map_key2 on message_section_map (sid, mid );
CREATE INDEX message_rdtree_idx on message using gist ( sections ) with ( islossy);
-- select some messages with section in 1 OR 2 - OVERLAP operator select message.mid from message where
message.sections&& '{1,2}';
-- select messages contains in sections 1 AND 2 - CONTAINS operator select message.mid from message where
message.sections@ '{1,2}'; -- the same, CONTAINED operator select message.mid from message where '{1,2}' ~
message.sections;
TEST:
subdirectory test contains test suite. cd ./test 1. createdb TEST 2. psql TEST < ../_int.sql 3. ./create_test.pl |
psqlTEST 4. ./bench.pl - perl script to benchmark queries, supports OR, AND queries with/without
RD-Tree.Run script without arguments to see availbale options.
a)test without RD-Tree (OR) ./bench.pl -d TEST -s 1,2 -v b)test with RD-Tree ./bench.pl -d TEST -s 1,2
-v-r
BENCHMARKS:
Size of table <message>: 200000
Size of table <message_section_map>: 268538
Distribution of messages by sections:
section 0: 73899 messages
section 1: 16298 messages
section 50: 1241 messages
section 99: 705 messages
old - without RD-Tree support,
new - with RD-Tree
+----------+---------------+----------------+
|Search set|OR, time in sec|AND, time in sec|
| +-------+-------+--------+-------+
| | old | new | old | new |
+----------+-------+-------+--------+-------+
| 1| 1.427| 0.215| -| -|
+----------+-------+-------+--------+-------+
| 99| 1.029| 0.018| -| -|
+----------+-------+-------+--------+-------+
| 1,2| 1.829| 0.334| 5.654| 0.042|
+----------+-------+-------+--------+-------+
| 1,2,50,60| 2.057| 0.359| 5.044| 0.007|
+----------+-------+-------+--------+-------+
Regards, Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83