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Document what values postgres_fdw sets for each parameter it sets.
David Rader, reviewed by me.
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<para>
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<para>
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<filename>postgres_fdw</> likewise establishes remote session settings
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<filename>postgres_fdw</> likewise establishes remote session settings
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for the parameters <xref linkend="guc-timezone">,
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for various parameters:
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<xref linkend="guc-datestyle">, <xref linkend="guc-intervalstyle">,
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<itemizedlist spacing="compact">
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and <xref linkend="guc-extra-float-digits">. These are less likely
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<listitem>
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to be problematic than <varname>search_path</>, but can be handled
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<para>
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with function <literal>SET</> options if the need arises.
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<xref linkend="guc-timezone"> is set to <literal>UTC</>
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</para>
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</listitem>
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<listitem>
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<para>
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<xref linkend="guc-datestyle"> is set to <literal>ISO</>
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</para>
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</listitem>
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<listitem>
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<para>
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<xref linkend="guc-intervalstyle"> is set to <literal>postgres</>
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</para>
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</listitem>
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<listitem>
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<para>
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<xref linkend="guc-extra-float-digits"> is set to <literal>3</> for remote
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servers 9.0 and newer and is set to <literal>2</> for older versions
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</para>
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</listitem>
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</itemizedlist>
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These are less likely to be problematic than <varname>search_path</>, but
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can be handled with function <literal>SET</> options if the need arises.
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</para>
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</para>
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<para>
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<para>
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