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Postgres FD Implementation
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Abuhujair Javed
Postgres FD Implementation
Commits
e1829591
Commit
e1829591
authored
Nov 12, 2007
by
Bruce Momjian
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Trim trailing whitespace --- needed commit to update anoncvs.
parent
0bd4da23
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doc/src/sgml/intarray.sgml
doc/src/sgml/intarray.sgml
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doc/src/sgml/intarray.sgml
View file @
e1829591
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@@ -27,8 +27,8 @@
<literal>int icount(int[])</literal> - the number of elements in intarray
</para>
<programlisting>
test=# select icount('{1,2,3}'::int[]);
icount
test=# select icount('{1,2,3}'::int[]);
icount
--------
3
(1 row)
...
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@@ -41,7 +41,7 @@ test=# select icount('{1,2,3}'::int[]);
</para>
<programlisting>
test=# select sort('{1,2,3}'::int[],'desc');
sort
sort
---------
{3,2,1}
(1 row)
...
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@@ -56,7 +56,7 @@ test=# select sort('{1,2,3}'::int[],'desc');
<listitem>
<para>
<literal>int[] sort_asc(int[]),sort_desc(int[])</literal> - shortcuts for sort
<literal>int[] sort_asc(int[]),sort_desc(int[])</literal> - shortcuts for sort
</para>
</listitem>
...
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@@ -66,7 +66,7 @@ test=# select sort('{1,2,3}'::int[],'desc');
</para>
<programlisting>
test=# select uniq(sort('{1,2,3,2,1}'::int[]));
uniq
uniq
---------
{1,2,3}
(1 row)
...
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@@ -75,12 +75,12 @@ test=# select uniq(sort('{1,2,3,2,1}'::int[]));
<listitem>
<para>
<literal>int idx(int[], int item)</literal> - returns index of first
<literal>int idx(int[], int item)</literal> - returns index of first
intarray matching element to item, or '0' if matching failed.
</para>
<programlisting>
test=# select idx('{1,2,3,2,1}'::int[],2);
idx
idx
-----
2
(1 row)
...
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@@ -89,12 +89,12 @@ test=# select idx('{1,2,3,2,1}'::int[],2);
<listitem>
<para>
<literal>int[] subarray(int[],int START [, int LEN])</literal> - returns
part of intarray starting from element number START (from 1) and length LEN.
<literal>int[] subarray(int[],int START [, int LEN])</literal> - returns
part of intarray starting from element number START (from 1) and length LEN.
</para>
<programlisting>
test=# select subarray('{1,2,3,2,1}'::int[],2,3);
subarray
subarray
----------
{2,3,2}
(1 row)
...
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@@ -107,7 +107,7 @@ test=# select subarray('{1,2,3,2,1}'::int[],2,3);
</para>
<programlisting>
test=# select intset(1);
intset
intset
--------
{1}
(1 row)
...
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@@ -178,8 +178,8 @@ test=# select intset(1);
<row>
<entry><literal>int[] @@ query_int</literal></entry>
<entry>
returns TRUE if array satisfies query (like
<literal>'1&(2|3)'</literal>)
returns TRUE if array satisfies query (like
<literal>'1&(2|3)'</literal>)
</entry>
</row>
...
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@@ -212,7 +212,7 @@ 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 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}';
...
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@@ -232,29 +232,29 @@ SELECT message.mid FROM message WHERE '{1,2}' <@ message.sections;
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
with/without RD-Tree. Run script without arguments to
see availbale options.
a)test without RD-Tree (OR)
./bench.pl -d TEST -c -s 1,2 -v
b)test with RD-Tree
b)test with RD-Tree
./bench.pl -d TEST -c -s 1,2 -v -r
BENCHMARKS:
Size of table <message>: 200000
Size of table <message_section_map>: 269133
Size of table <message_section_map>: 269133
Distribution of messages by sections:
section 0: 74377 messages
section 1: 16284 messages
section 50: 1229 messages
section 99: 683 messages
old - without RD-Tree support,
new - with RD-Tree
+----------+---------------+----------------+
|Search set|OR, time in sec|AND, time in sec|
| +-------+-------+--------+-------+
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@@ -274,10 +274,10 @@ SELECT message.mid FROM message WHERE '{1,2}' <@ message.sections;
<sect2>
<title>Authors</title>
<para>
All work was done by Teodor Sigaev (<email>teodor@stack.net</email>) and Oleg
Bartunov (<email>oleg@sai.msu.su</email>). See
<ulink url="http://www.sai.msu.su/~megera/postgres/gist"></ulink> for
additional information. Andrey Oktyabrski did a great work on adding new
All work was done by Teodor Sigaev (<email>teodor@stack.net</email>) and Oleg
Bartunov (<email>oleg@sai.msu.su</email>). See
<ulink url="http://www.sai.msu.su/~megera/postgres/gist"></ulink> for
additional information. Andrey Oktyabrski did a great work on adding new
functions and operations.
</para>
</sect2>
...
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