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Doc: fill in "major enhancements" list in v13 release notes.
Jonathan S. Katz, minor tweaks by me Discussion: https://postgr.es/m/448a382b-ae07-3126-5a08-aacda9aa28ea@postgresql.org
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doc/src/sgml/release-13.sgml

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<sect2>
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<title>Overview</title>
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<para>
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Major enhancements in <productname>PostgreSQL</productname> 13 include:
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</para>
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<!-- Items in this list summarize one or more items below -->
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<para>
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<productname>PostgreSQL</productname> 13 contains many new features and
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enhancements, including:
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</para>
2019

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<itemizedlist>
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<listitem>
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<para>TBD</para>
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<para>
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Space savings and performance gains from de-duplication of B-tree
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index entries
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</para>
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</listitem>
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<listitem>
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<para>
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Improved performance for queries that use aggregates or partitioned
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tables
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</para>
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</listitem>
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<listitem>
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<para>
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Better query planning when using extended statistics
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</para>
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</listitem>
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<listitem>
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<para>
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Parallelized vacuuming of B-tree indexes
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</para>
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</listitem>
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<listitem>
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<para>
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Incremental sorting
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</para>
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</listitem>
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</itemizedlist>
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<para>
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The above items are explained in more detail in the sections below.
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</para>
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<para>
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The above items and other new features
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of <productname>PostgreSQL</productname> 13 are explained in more
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detail in the sections below.
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</para>
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</sect2>
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<para>
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Add btree index deduplication processing columns to pageinspect output
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Add btree index de-duplication processing columns to pageinspect output
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(Peter Geoghegan)
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</para>
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</listitem>

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