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docs: Merge separate chapters on built-in index AMs into one.
The documentation index is getting very long, which makes it hard to find things. Since these chapters are all very similar in structure and content, merging them is a natural way of reducing the size of the toplevel index. Rather than actually combining all of the SGML into a single file, keep one file per <sect1>, and add a glue file that includes all of them. Discussion: http://postgr.es/m/CA+Tgmob7_uoYuS2=rVwpVXaRwP-UXz+++saYTC-BCZ42QzSNKQ@mail.gmail.com
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‎doc/src/sgml/brin.sgml

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<!-- doc/src/sgml/brin.sgml -->
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<chapter id="brin">
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<sect1 id="brin">
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<title>BRIN Indexes</title>
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<indexterm>
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<primary>index</primary>
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<secondary>BRIN</secondary>
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</indexterm>
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<sect1 id="brin-intro">
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<sect2 id="brin-intro">
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<title>Introduction</title>
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<para>
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be more precise and more data blocks can be skipped during an index scan.
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</para>
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<sect2 id="brin-operation">
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<sect3 id="brin-operation">
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<title>Index Maintenance</title>
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<para>
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See <xref linkend="functions-admin-index"/> for details.
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</para>
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</sect2>
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</sect1>
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</sect3>
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</sect2>
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<sect1 id="brin-builtin-opclasses">
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<sect2 id="brin-builtin-opclasses">
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<title>Built-in Operator Classes</title>
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<para>
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</tgroup>
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</table>
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<sect2 id="brin-builtin-opclasses--parameters">
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<sect3 id="brin-builtin-opclasses--parameters">
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<title>Operator Class Parameters</title>
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<para>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect3>
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</sect1>
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</sect2>
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<sect1 id="brin-extensibility">
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<sect2 id="brin-extensibility">
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<title>Extensibility</title>
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<para>
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<literal>float4_minmax_ops</literal> as an example of minmax, and
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<literal>box_inclusion_ops</literal> as an example of inclusion.
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</para>
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</sect2>
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</sect1>
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</chapter>

‎doc/src/sgml/btree.sgml

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<!-- doc/src/sgml/btree.sgml -->
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<chapter id="btree">
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<sect1 id="btree">
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<title>B-Tree Indexes</title>
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<indexterm>
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<primary>index</primary>
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<secondary>B-Tree</secondary>
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</indexterm>
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<sect1 id="btree-intro">
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<sect2 id="btree-intro">
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<title>Introduction</title>
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<para>
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btree <acronym>AM</acronym> make use of them.
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</para>
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</sect1>
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</sect2>
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<sect1 id="btree-behavior">
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<sect2 id="btree-behavior">
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<title>Behavior of B-Tree Operator Classes</title>
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planner relies on them for optimization purposes.
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</para>
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</sect1>
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</sect2>
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<sect1 id="btree-support-funcs">
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<sect2 id="btree-support-funcs">
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<title>B-Tree Support Functions</title>
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<para>
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</varlistentry>
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</variablelist>
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</sect2>
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<sect2 id="btree-implementation">
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<title>Implementation</title>
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<para>
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distribution for a much more detailed, internals-focused description
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of the B-Tree implementation.
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</para>
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<sect2 id="btree-structure">
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<sect3 id="btree-structure">
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<title>B-Tree Structure</title>
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<para>
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<productname>PostgreSQL</productname> B-Tree indexes are
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the tree structure by creating a new root page that is one level
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above the original root page.
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</para>
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</sect2>
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</sect3>
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<sect2 id="btree-deletion">
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<sect3 id="btree-deletion">
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<title>Bottom-up Index Deletion</title>
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<para>
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B-Tree indexes are not directly aware that under MVCC, there might
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two logical rows whose lifetimes span the same
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<command>VACUUM</command> cycle).
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</para>
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</sect3>
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<sect2 id="btree-deduplication">
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<sect3 id="btree-deduplication">
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<title>Deduplication</title>
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<para>
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A duplicate is a leaf page tuple (a tuple that points to a table
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</itemizedlist>
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</sect3>
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</chapter>
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</sect1>

‎doc/src/sgml/filelist.sgml

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<!ENTITY catalogs SYSTEM "catalogs.sgml">
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<!ENTITY system-views SYSTEM "system-views.sgml">
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<!ENTITY geqo SYSTEM "geqo.sgml">
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<!ENTITY indextypes SYSTEM "indextypes.sgml">
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<!ENTITY btree SYSTEM "btree.sgml">
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<!ENTITY gist SYSTEM "gist.sgml">
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<!ENTITY spgist SYSTEM "spgist.sgml">

‎doc/src/sgml/gin.sgml

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<!-- doc/src/sgml/gin.sgml -->
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<chapter id="gin">
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<sect1 id="gin">
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<title>GIN Indexes</title>
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<indexterm>
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<primary>index</primary>
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<secondary>GIN</secondary>
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</indexterm>
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<sect2 id="gin-intro">
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<title>Introduction</title>
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information about <acronym>GIN</acronym> on their
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<ulink url="http://www.sai.msu.su/~megera/wiki/Gin">website</ulink>.
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</para>
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<sect2 id="gin-builtin-opclasses">
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<title>Built-in Operator Classes</title>
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See <xref linkend="json-indexing"/> for details.
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<sect2 id="gin-extensibility">
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though the actual type might be something else depending on the operator.
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</mediaobject>
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</figure>
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<sect3 id="gin-fast-update">
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<title>GIN Fast Update Technique</title>
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<acronym>GIN</acronym> index. See <xref linkend="sql-createindex"/>
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for details.
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<sect3 id="gin-partial-match">
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to be searched, or greater than zero if the index key is past the range
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that could match.
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</sect3>
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<title>Limitations</title>
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however that null key values contained within a non-null composite item
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or query value are supported.
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‎doc/src/sgml/gist.sgml

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<!-- doc/src/sgml/gist.sgml -->
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<sect1 id="gist">
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<title>GiST Indexes</title>
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<ulink url="http://www.sai.msu.su/~megera/postgres/gist/">web site</ulink>.
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<sect2 id="gist-builtin-opclasses">
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<title>Built-in Operator Classes</title>
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<para>
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</programlisting>
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will accumulate for the duration of the operation.
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is ordered.
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</sect1>

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