57 lines
1.7 KiB
Plaintext
57 lines
1.7 KiB
Plaintext
<!-- $PostgreSQL: pgsql/doc/src/sgml/btree-gist.sgml,v 1.4 2007/12/06 04:12:09 tgl Exp $ -->
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<sect1 id="btree-gist">
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<title>btree_gist</title>
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<indexterm zone="btree-gist">
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<primary>btree_gist</primary>
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</indexterm>
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<para>
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<filename>btree_gist</> provides sample GiST operator classes that
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implement B-Tree equivalent behavior for the data types
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<type>int2</>, <type>int4</>, <type>int8</>, <type>float4</>,
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<type>float8</>, <type>numeric</>, <type>timestamp with time zone</>,
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<type>timestamp without time zone</>, <type>time with time zone</>,
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<type>time without time zone</>, <type>date</>, <type>interval</>,
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<type>oid</>, <type>money</>, <type>char</>,
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<type>varchar</>, <type>text</>, <type>bytea</>, <type>bit</>,
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<type>varbit</>, <type>macaddr</>, <type>inet</>, and <type>cidr</>.
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</para>
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<para>
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In general, these operator classes will not outperform the equivalent
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standard btree index methods, and they lack one major feature of the
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standard btree code: the ability to enforce uniqueness. However,
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they are useful for GiST testing and as a base for developing other
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GiST operator classes.
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</para>
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<sect2>
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<title>Example usage</title>
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<programlisting>
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CREATE TABLE test (a int4);
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-- create index
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CREATE INDEX testidx ON test USING gist (a);
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-- query
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SELECT * FROM test WHERE a < 10;
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</programlisting>
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</sect2>
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<sect2>
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<title>Authors</title>
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<para>
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Teodor Sigaev (<email>teodor@stack.net</email>) ,
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Oleg Bartunov (<email>oleg@sai.msu.su</email>), and
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Janko Richter (<email>jankorichter@yahoo.de</email>). See
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<ulink url="http://www.sai.msu.su/~megera/postgres/gist"></ulink>
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for additional information.
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</para>
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</sect2>
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</sect1>
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