postgresql/contrib/intarray
Bruce Momjian 92288a1cf9 Change made to elog:
o  Change all current CVS messages of NOTICE to WARNING.  We were going
to do this just before 7.3 beta but it has to be done now, as you will
see below.

o Change current INFO messages that should be controlled by
client_min_messages to NOTICE.

o Force remaining INFO messages, like from EXPLAIN, VACUUM VERBOSE, etc.
to always go to the client.

o Remove INFO from the client_min_messages options and add NOTICE.

Seems we do need three non-ERROR elog levels to handle the various
behaviors we need for these messages.

Regression passed.
2002-03-06 06:10:59 +00:00
..
bench Restructure pg_opclass, pg_amop, and pg_amproc per previous discussions in 2001-08-21 16:36:06 +00:00
data 1. Fixed error with empty array ( '{}' ), 2001-08-04 19:35:32 +00:00
expected Update required due to recent changes in FigureColname. 2001-09-30 16:15:59 +00:00
sql please apply attached patch to current CVS. 2001-09-23 04:16:16 +00:00
_int.c Change made to elog: 2002-03-06 06:10:59 +00:00
_int.sql.in Remove bogus pg_amop insertion commands, per discussion of 25-Oct. 2001-11-24 23:28:09 +00:00
Makefile To fix the perpetually broken makefiles in the contrib tree, I have 2001-09-06 10:49:30 +00:00
README.intarray 1. Implemented binary search in array 2001-10-04 15:41:14 +00:00

This is an implementation of RD-tree data structure using GiST interface
of PostgreSQL. It has built-in lossy compression.

Current implementation provides index support for one-dimensional array of
int4's - gist__int_ops, suitable for small and medium size of arrays (used on
default), and gist__intbig_ops for indexing large arrays (we use superimposed
signature with length of 4096 bits to represent sets).

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

CHANGES:

October 1, 2001
   1. Change search method in array to binary
September 28, 2001
   1. gist__int_ops now is without lossy
   2. add sort entry in picksplit
September 21, 2001
   1. Added support for boolean query (indexable operator @@, looks like
      a @@ '1|(2&3)', perfomance is better in any case )
   2. Done some small optimizations
March 19, 2001
   1. Added support for toastable keys
   2. Improved split algorithm for intbig (selection speedup is about 30%)

INSTALLATION:

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

REGRESSION TEST:

   gmake installcheck

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 gist__int_ops);

  -- 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;

BENCHMARK:

  subdirectory bench contains benchmark suite.
  cd ./bench
  1. createdb TEST
  2. psql TEST < ../_int.sql
  3. ./create_test.pl | psql TEST
  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|
+----------+-------+-------+--------+-------+