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Add a DEFAULT option to COPY FROM

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This allows for a string which if an input field matches causes the
column's default value to be inserted. The advantage of this is that
the default can be inserted in some rows and not others, for which
non-default data is available.

The file_fdw extension is also modified to take allow use of this
option.

Israel Barth Rubio

Discussion: https://postgr.es/m/CAO_rXXAcqesk6DsvioOZ5zmeEmpUN5ktZf-9=9yu+DTr0Xr8Uw@mail.gmail.com
This commit is contained in:
Andrew Dunstan
2023-03-13 10:01:56 -04:00
parent 7b14e20b12
commit 9f8377f7a2
15 changed files with 447 additions and 24 deletions
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14
doc/src/sgml/ref/copy.sgml
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@ -43,6 +43,7 @@ COPY { <replaceable class="parameter">table_name</replaceable> [ ( <replaceable
FORCE_NOT_NULL ( <replaceable class="parameter">column_name</replaceable> [, ...] )
FORCE_NULL ( <replaceable class="parameter">column_name</replaceable> [, ...] )
ENCODING '<replaceable class="parameter">encoding_name</replaceable>'
DEFAULT '<replaceable class="parameter">default_string</replaceable>'
</synopsis>
</refsynopsisdiv>
@ -368,6 +369,19 @@ COPY { <replaceable class="parameter">table_name</replaceable> [ ( <replaceable
</listitem>
</varlistentry>
<varlistentry>
<term><literal>DEFAULT</literal></term>
<listitem>
<para>
Specifies the string that represents a default value. Each time the string
is found in the input file, the default value of the corresponding column
will be used.
This option is allowed only in <command>COPY FROM</command>, and only when
not using <literal>binary</literal> format.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>WHERE</literal></term>
<listitem>