doc: Add example for how to set file_fdw column option
The documentation is pretty light on how to set column options on foreign tables, and the file_fdw docs refer to COPY when documenting force_null even though it's not used in the same way. Add a small example to describe how to use it. Reported-by: Boshomi Phenix <boshomi@gmail.com> Discussion: https://postgr.es/m/CAJVkCUparn4_Oarernm=U6LWVsTkecKcALHtwGr5M3qJRj_czw@mail.gmail.com
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@ -279,4 +279,20 @@ OPTIONS ( filename 'log/pglog.csv', format 'csv' );
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</para>
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</example>
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<example>
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<title>Create a Foreign Table with an option on a column</title>
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<para>
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To set the <literal>force_null</literal> option for a column, use the
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<literal>OPTIONS</literal> keyword.
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</para>
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<programlisting>
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CREATE FOREIGN TABLE films (
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code char(5) NOT NULL,
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title text NOT NULL,
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rating text OPTIONS (force_null 'true')
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) SERVER film_server
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OPTIONS ( filename 'films/db.csv', format 'csv' );
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</programlisting>
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</example>
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</sect1>
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