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- <!-- $PostgreSQL: pgsql/doc/src/sgml/filelist.sgml,v 1.45 2006/09/04 20:10:53 momjian Exp $ -->
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+ <!-- $PostgreSQL: pgsql/doc/src/sgml/filelist.sgml,v 1.46 2006/09/05 03:09:56 momjian Exp $ -->
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<!entity history SYSTEM "history.sgml">
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<!entity info SYSTEM "info.sgml">
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<!entity catalogs SYSTEM "catalogs.sgml">
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<!entity geqo SYSTEM "geqo.sgml">
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<!entity gist SYSTEM "gist.sgml">
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- <!entity gin SYSTEM "gin.sgml">
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<!entity planstats SYSTEM "planstats.sgml">
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<!entity indexam SYSTEM "indexam.sgml">
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<!entity nls SYSTEM "nls.sgml">
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- <!-- $PostgreSQL: pgsql/doc/src/sgml/xindex.sgml,v 1.44 2006/09/04 20:10:53 momjian Exp $ -->
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+ <!-- $PostgreSQL: pgsql/doc/src/sgml/xindex.sgml,v 1.45 2006/09/05 03:09:56 momjian Exp $ -->
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<sect1 id="xindex">
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<title>Interfacing Extensions To Indexes</title>
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</tgroup>
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</table>
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- <para>
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- GIN indexes require four support functions,
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- shown in <xref linkend="xindex-gin-support-table">.
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- </para>
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-
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- <table tocentry="1" id="xindex-gin-support-table">
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- <title>GIN Support Functions</title>
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- <tgroup cols="2">
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- <thead>
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- <row>
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- <entry>Function</entry>
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- <entry>Support Number</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>compare</entry>
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- <entry>1</entry>
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- </row>
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- <row>
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- <entry>extract value</entry>
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- <entry>2</entry>
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- </row>
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- <row>
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- <entry>extract query</entry>
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- <entry>3</entry>
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- </row>
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- <row>
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- <entry>consistent</entry>
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- <entry>4</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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-
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<para>
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Unlike strategy operators, support functions return whichever data
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type the particular index method expects; for example in the case
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