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Add FORCE_NOT_NULL support to the file_fdw foreign data wrapper.

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This is implemented as a per-column boolean option, rather than trying
to match COPY's convention of a single option listing the column names.

Shigeru Hanada, reviewed by KaiGai Kohei
This commit is contained in:
Tom Lane
2011-09-16 16:35:51 -04:00
parent 9d306c66e6
commit 86a3f2d492
5 changed files with 185 additions and 12 deletions
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31
doc/src/sgml/file-fdw.sgml
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@ -111,14 +111,37 @@
</variablelist>
<para>
<command>COPY</>'s <literal>OIDS</literal>, <literal>FORCE_QUOTE</literal>,
and <literal>FORCE_NOT_NULL</literal> options are currently not supported by
A column of a foreign table created using this wrapper can have the
following options:
</para>
<variablelist>
<varlistentry>
<term><literal>force_not_null</literal></term>
<listitem>
<para>
This is a boolean option. If true, it specifies that values of the
column should not be matched against the null string (that is, the
file-level <literal>null</literal> option). This has the same effect
as listing the column in <command>COPY</>'s
<literal>FORCE_NOT_NULL</literal> option.
</para>
</listitem>
</varlistentry>
</variablelist>
<para>
<command>COPY</>'s <literal>OIDS</literal> and
<literal>FORCE_QUOTE</literal> options are currently not supported by
<literal>file_fdw</>.
</para>
<para>
These options can only be specified for a foreign table, not in the
options of the <literal>file_fdw</> foreign-data wrapper, nor in the
These options can only be specified for a foreign table or its columns, not
in the options of the <literal>file_fdw</> foreign-data wrapper, nor in the
options of a server or user mapping using the wrapper.
</para>