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This allows these modules to be installed into a database without superuser privileges (assuming that the DBA or sysadmin has installed the module's files in the expected place). You only need CREATE privilege on the current database, which by default would be available to the database owner. The following modules are marked trusted: btree_gin btree_gist citext cube dict_int earthdistance fuzzystrmatch hstore hstore_plperl intarray isn jsonb_plperl lo ltree pg_trgm pgcrypto seg tablefunc tcn tsm_system_rows tsm_system_time unaccent uuid-ossp In the future we might mark some more modules trusted, but there seems to be no debate about these, and on the whole it seems wise to be conservative with use of this feature to start out with. Discussion: https://postgr.es/m/32315.1580326876@sss.pgh.pa.us
67 lines
2.3 KiB
Plaintext
67 lines
2.3 KiB
Plaintext
<!-- doc/src/sgml/btree-gin.sgml -->
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<sect1 id="btree-gin" xreflabel="btree_gin">
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<title>btree_gin</title>
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<indexterm zone="btree-gin">
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<primary>btree_gin</primary>
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</indexterm>
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<para>
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<filename>btree_gin</filename> provides sample GIN operator classes that
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implement B-tree equivalent behavior for the data types
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<type>int2</type>, <type>int4</type>, <type>int8</type>, <type>float4</type>,
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<type>float8</type>, <type>timestamp with time zone</type>,
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<type>timestamp without time zone</type>, <type>time with time zone</type>,
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<type>time without time zone</type>, <type>date</type>, <type>interval</type>,
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<type>oid</type>, <type>money</type>, <type>"char"</type>,
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<type>varchar</type>, <type>text</type>, <type>bytea</type>, <type>bit</type>,
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<type>varbit</type>, <type>macaddr</type>, <type>macaddr8</type>, <type>inet</type>,
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<type>cidr</type>, <type>uuid</type>, <type>name</type>, <type>bool</type>,
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<type>bpchar</type>, and all <type>enum</type> types.
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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 B-tree index methods, and they lack one major feature of the
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standard B-tree code: the ability to enforce uniqueness. However,
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they are useful for GIN testing and as a base for developing other
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GIN operator classes. Also, for queries that test both a GIN-indexable
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column and a B-tree-indexable column, it might be more efficient to create
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a multicolumn GIN index that uses one of these operator classes than to create
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two separate indexes that would have to be combined via bitmap ANDing.
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</para>
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<para>
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This module is considered <quote>trusted</quote>, that is, it can be
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installed by non-superusers who have <literal>CREATE</literal> privilege
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on the current database.
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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 GIN (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>) and
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Oleg Bartunov (<email>oleg@sai.msu.su</email>). See
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<ulink url="http://www.sai.msu.su/~megera/oddmuse/index.cgi/Gin"></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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