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doc: adjustments for PG 12 release notes
Mostly commit messages, attribution, and text, all suggested by Andres Freund. Discussion: https://postgr.es/m/20190520221719.pqgld3krjc2docr5@alap3.anarazel.de
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doc/src/sgml/release-12.sgml

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@@ -982,8 +982,6 @@ Author: Bruce Momjian <bruce@momjian.us>
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<!--
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Author: Tomas Vondra <tomas.vondra@postgresql.org>
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2019-01-29 [36a1281f8] Separate per-batch and per-tuple memory contexts in COPY
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Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
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2019-01-25 [9556aa01c] Use single-byte Boyer-Moore-Horspool search even with mu
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Author: Andres Freund <andres@anarazel.de>
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2019-01-26 [a9c35cf85] Change function call information to be variable length.
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-->
@@ -1517,7 +1515,7 @@ Author: Michael Paquier <michael@paquier.xyz>
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<para>
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Prevent <xref linkend="sql-truncate"/> from requesting a lock on
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tables for which it lacks permission (Michaël Paquier)
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tables for which the user lacks permission (Michaël Paquier)
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</para>
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<para>
@@ -1882,9 +1880,10 @@ Author: Peter Eisentraut <peter@eisentraut.org>
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</para>
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<para>
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Rather than storing a value only at row creation time, generated
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columns are also modified during updates, and can reference other
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table columns.
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The content of generated columns are computed from expressions
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(including references to other columns in the same table)
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rather than being specified by <command>INSERT</command> or
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<command>UPDATE</command> commands.
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</para>
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</listitem>
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@@ -2061,7 +2060,7 @@ Author: Peter Eisentraut <peter@eisentraut.org>
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-->
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<para>
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Allow modifications of system tables using <xref
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Allow modifications of system table options using <xref
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linkend="sql-altertable"/> (Peter Eisentraut)
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</para>
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@@ -2595,8 +2594,8 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>
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-->
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<para>
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Compute behavior based on pgbench's <option>--rate</option>
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value more precisely (Tom Lane)
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Improve precision of pgbench's <option>--rate</option>
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option (Tom Lane)
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</para>
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</listitem>
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@@ -2816,11 +2815,12 @@ Author: Thomas Munro <tmunro@postgresql.org>
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-->
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<para>
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Allow restoration of an <command>INSERT</command>-statement dump
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to skip rows which would cause conflicts (Surafel Temesgen)
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Allow pg_dump to emit <command>INSERT ... ON CONFLICT DO
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NOTHING</command> (Surafel Temesgen)
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</para>
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<para>
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This avoids conflict failures during restore.
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The <application>pg_dump</application> option is
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<option>--on-conflict-do-nothing</option>.
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</para>
@@ -2875,6 +2875,8 @@ Author: Andrew Dunstan <andrew@dunslane.net>
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<listitem>
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<!--
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Author: Andres Freund <andres@anarazel.de>
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2018-11-16 [4da597edf] Make TupleTableSlots extensible, finish split of
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Author: Andres Freund <andres@anarazel.de>
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2019-03-06 [8586bf7ed] tableam: introduce table AM infrastructure.
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Author: Andres Freund <andres@anarazel.de>
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2019-03-06 [3b925e905] tableam: Add pg_dump support.
@@ -2890,12 +2892,20 @@ Author: Andres Freund <andres@anarazel.de>
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2019-03-31 [73c954d24] tableam: sample scan.
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Author: Andres Freund <andres@anarazel.de>
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2019-03-31 [bfbcad478] tableam: bitmap table scan.
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existin
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-->
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<para>
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Add <xref linkend="sql-create-access-method"/> command to create
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new table types (Haribabu Kommi, Andres Freund, Álvaro Herrera,
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Dimitri Dolgov)
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new table types (Andres Freund, Haribabu Kommi, Álvaro Herrera,
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Alexander Korotkov, Dimitri Golgov)
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</para>
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<para>
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This enables the development of new <link linkend="tableam">table
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access methods</>, which can optimize storage for different
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use-cases. The existing <literal>heap</literal> access method
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remains the default.
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</para>
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</listitem>
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