Add catalogs.sgml documentation for text search catalogs.
This commit is contained in:
Tom Lane
parent
ec4b6a81f6
commit
eb9f280ca7
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<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.158 2007/09/20 17:56:30 tgl Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.159 2007/10/01 21:10:40 tgl Exp $ -->
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<!--
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Documentation of the system catalogs, directed toward PostgreSQL developers
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-->
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@ -218,6 +218,31 @@
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<entry>triggers</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-ts-config"><structname>pg_ts_config</structname></link></entry>
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<entry>text search configurations</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-ts-config-map"><structname>pg_ts_config_map</structname></link></entry>
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<entry>text search configurations' token mappings</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-ts-dict"><structname>pg_ts_dict</structname></link></entry>
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<entry>text search dictionaries</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-ts-parser"><structname>pg_ts_parser</structname></link></entry>
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<entry>text search parsers</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-ts-template"><structname>pg_ts_template</structname></link></entry>
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<entry>text search templates</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-type"><structname>pg_type</structname></link></entry>
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<entry>data types</entry>
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@ -2481,6 +2506,7 @@
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</table>
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</sect1>
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<sect1 id="catalog-pg-index">
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<title><structname>pg_index</structname></title>
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@ -3269,7 +3295,7 @@
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Each operator family is a collection of operators and associated
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support routines that implement the semantics specified for a particular
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index access method. Furthermore, the operators in a family are all
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<quote>compatible</>, in a way that depends on the access method.
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<quote>compatible</>, in a way that is specified by the access method.
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The operator family concept allows cross-data-type operators to be used
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with indexes and to be reasoned about using knowledge of access method
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semantics.
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@ -4404,6 +4430,382 @@
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</sect1>
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<sect1 id="catalog-pg-ts-config">
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<title><structname>pg_ts_config</structname></title>
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<indexterm zone="catalog-pg-ts-config">
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<primary>pg_ts_config</primary>
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</indexterm>
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<para>
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The <structname>pg_ts_config</structname> catalog contains entries
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representing text search configurations. A configuration specifies
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a particular text search parser and a list of dictionaries to use
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for each of the parser's output token types. The parser is shown
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in the <structname>pg_ts_config</structname> entry, but the
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token-to-dictionary mapping is defined by subsidiary entries in <link
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linkend="catalog-pg-ts-config-map"><structname>pg_ts_config_map</structname></link>.
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</para>
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<para>
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<productname>PostgreSQL</productname>'s text search features are
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described at length in <xref linkend="textsearch">.
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</para>
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<table>
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<title><structname>pg_ts_config</> Columns</title>
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<tgroup cols=4>
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Type</entry>
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<entry>References</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>cfgname</structfield></entry>
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<entry><type>name</type></entry>
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<entry></entry>
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<entry>Text search configuration name</entry>
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</row>
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<row>
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<entry><structfield>cfgnamespace</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.oid</literal></entry>
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<entry>
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The OID of the namespace that contains this configuration
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</entry>
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</row>
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<row>
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<entry><structfield>cfgowner</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.oid</literal></entry>
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<entry>Owner of the configuration</entry>
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</row>
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<row>
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<entry><structfield>cfgparser</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-ts-parser"><structname>pg_ts_parser</structname></link>.oid</literal></entry>
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<entry>The OID of the text search parser for this configuration</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1 id="catalog-pg-ts-config-map">
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<title><structname>pg_ts_config_map</structname></title>
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<indexterm zone="catalog-pg-ts-config-map">
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<primary>pg_ts_config_map</primary>
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</indexterm>
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<para>
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The <structname>pg_ts_config_map</structname> catalog contains entries
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showing which text search dictionaries should be consulted, and in
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what order, for each output token type of each text search configuration's
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parser.
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</para>
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<para>
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<productname>PostgreSQL</productname>'s text search features are
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described at length in <xref linkend="textsearch">.
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</para>
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<table>
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<title><structname>pg_ts_config_map</> Columns</title>
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<tgroup cols=4>
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Type</entry>
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<entry>References</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>mapcfg</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-ts-config"><structname>pg_ts_config</structname></link>.oid</literal></entry>
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<entry>The OID of the <structname>pg_ts_config</> entry owning this map entry</entry>
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</row>
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<row>
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<entry><structfield>maptokentype</structfield></entry>
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<entry><type>integer</type></entry>
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<entry></entry>
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<entry>A token type emitted by the configuration's parser</entry>
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</row>
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<row>
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<entry><structfield>mapseqno</structfield></entry>
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<entry><type>integer</type></entry>
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<entry></entry>
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<entry>Order in which to consult this entry (lower
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<structfield>mapseqno</>s first)</entry>
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</row>
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<row>
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<entry><structfield>mapdict</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-ts-dict"><structname>pg_ts_dict</structname></link>.oid</literal></entry>
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<entry>The OID of the text search dictionary to consult</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1 id="catalog-pg-ts-dict">
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<title><structname>pg_ts_dict</structname></title>
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<indexterm zone="catalog-pg-ts-dict">
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<primary>pg_ts_dict</primary>
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</indexterm>
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<para>
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The <structname>pg_ts_dict</structname> catalog contains entries
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defining text search dictionaries. A dictionary depends on a text
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search template, which specifies all the implementation functions
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needed; the dictionary itself provides values for the user-settable
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parameters supported by the template. This division of labor allows
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dictionaries to be created by unprivileged users. The parameters
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are specified by a text string <structfield>dictinitoption</>,
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whose format and meaning vary depending on the template.
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</para>
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<para>
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<productname>PostgreSQL</productname>'s text search features are
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described at length in <xref linkend="textsearch">.
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</para>
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<table>
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<title><structname>pg_ts_dict</> Columns</title>
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<tgroup cols=4>
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Type</entry>
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<entry>References</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>dictname</structfield></entry>
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<entry><type>name</type></entry>
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<entry></entry>
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<entry>Text search dictionary name</entry>
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</row>
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<row>
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<entry><structfield>dictnamespace</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.oid</literal></entry>
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<entry>
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The OID of the namespace that contains this dictionary
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</entry>
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</row>
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<row>
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<entry><structfield>dictowner</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.oid</literal></entry>
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<entry>Owner of the dictionary</entry>
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</row>
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<row>
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<entry><structfield>dicttemplate</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-ts-template"><structname>pg_ts_template</structname></link>.oid</literal></entry>
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<entry>The OID of the text search template for this dictionary</entry>
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</row>
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<row>
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<entry><structfield>dictinitoption</structfield></entry>
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<entry><type>text</type></entry>
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<entry></entry>
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<entry>Initialization option string for the template</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1 id="catalog-pg-ts-parser">
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<title><structname>pg_ts_parser</structname></title>
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<indexterm zone="catalog-pg-ts-parser">
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<primary>pg_ts_parser</primary>
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</indexterm>
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<para>
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The <structname>pg_ts_parser</structname> catalog contains entries
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defining text search parsers. A parser is responsible for splitting
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input text into lexemes and assigning a token type to each lexeme.
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Since a parser must be implemented by C-language-level functions,
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creation of new parsers is restricted to database superusers.
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</para>
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<para>
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<productname>PostgreSQL</productname>'s text search features are
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described at length in <xref linkend="textsearch">.
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</para>
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<table>
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<title><structname>pg_ts_parser</> Columns</title>
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<tgroup cols=4>
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Type</entry>
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<entry>References</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>prsname</structfield></entry>
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<entry><type>name</type></entry>
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<entry></entry>
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<entry>Text search parser name</entry>
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</row>
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<row>
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<entry><structfield>prsnamespace</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.oid</literal></entry>
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<entry>
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The OID of the namespace that contains this parser
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</entry>
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</row>
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<row>
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<entry><structfield>prsstart</structfield></entry>
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<entry><type>regproc</type></entry>
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<entry><literal><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.oid</literal></entry>
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<entry>OID of the parser's startup function</entry>
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</row>
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<row>
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<entry><structfield>prstoken</structfield></entry>
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<entry><type>regproc</type></entry>
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<entry><literal><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.oid</literal></entry>
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<entry>OID of the parser's next-token function</entry>
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</row>
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<row>
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<entry><structfield>prsend</structfield></entry>
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<entry><type>regproc</type></entry>
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<entry><literal><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.oid</literal></entry>
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<entry>OID of the parser's shutdown function</entry>
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</row>
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<row>
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<entry><structfield>prsheadline</structfield></entry>
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<entry><type>regproc</type></entry>
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<entry><literal><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.oid</literal></entry>
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<entry>OID of the parser's headline function</entry>
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</row>
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<row>
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<entry><structfield>prslextype</structfield></entry>
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<entry><type>regproc</type></entry>
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<entry><literal><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.oid</literal></entry>
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<entry>OID of the parser's lextype function</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1 id="catalog-pg-ts-template">
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<title><structname>pg_ts_template</structname></title>
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<indexterm zone="catalog-pg-ts-template">
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<primary>pg_ts_template</primary>
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</indexterm>
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<para>
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The <structname>pg_ts_template</structname> catalog contains entries
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defining text search templates. A template is the implementation
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skeleton for a class of text search dictionaries.
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Since a template must be implemented by C-language-level functions,
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creation of new templates is restricted to database superusers.
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</para>
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<para>
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<productname>PostgreSQL</productname>'s text search features are
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described at length in <xref linkend="textsearch">.
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</para>
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<table>
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<title><structname>pg_ts_template</> Columns</title>
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<tgroup cols=4>
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Type</entry>
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<entry>References</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>tmplname</structfield></entry>
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<entry><type>name</type></entry>
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<entry></entry>
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<entry>Text search template name</entry>
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</row>
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<row>
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<entry><structfield>tmplnamespace</structfield></entry>
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<entry><type>oid</type></entry>
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<entry><literal><link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.oid</literal></entry>
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<entry>
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The OID of the namespace that contains this template
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</entry>
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</row>
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<row>
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<entry><structfield>tmplinit</structfield></entry>
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<entry><type>regproc</type></entry>
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<entry><literal><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.oid</literal></entry>
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<entry>OID of the template's initialization function</entry>
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</row>
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<row>
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<entry><structfield>tmpllexize</structfield></entry>
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<entry><type>regproc</type></entry>
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<entry><literal><link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.oid</literal></entry>
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<entry>OID of the template's lexize function</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1 id="catalog-pg-type">
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<title><structname>pg_type</structname></title>
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