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doc: Clarify COPY FROM WHERE expression restrictions

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Commit aa606b9316 disallowed generated columns in COPY FROM WHERE
expressions, and commit 21c69dc73f disallowed system columns.
However, the COPY reference page still mentions only the restriction
on subqueries.

Update the documentation to also list generated columns and system
columns as unsupported in COPY FROM WHERE expressions.

Backpatch the generated-column documentation change to all supported
versions. Backpatch the system-column documentation change to v19,
where that restriction was introduced.

Author: Fujii Masao <masao.fujii@gmail.com>
Reviewed-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Discussion: https://postgr.es/m/CAHGQGwEgxErc54yVOAVWCsr1O=8pgw4oKRPuEQ9mfhkoYGR_XA@mail.gmail.com
Backpatch-through: 14
This commit is contained in:
Fujii Masao 2026-07-08 12:45:20 +09:00
parent 1383cbd031
commit abecdbc6af
1 changed files with 5 additions and 4 deletions
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9
doc/src/sgml/ref/copy.sgml
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@ -480,10 +480,11 @@ WHERE <replaceable class="parameter">condition</replaceable>
</para>
<para>
Currently, subqueries are not allowed in <literal>WHERE</literal>
expressions, and the evaluation does not see any changes made by the
<command>COPY</command> itself (this matters when the expression
contains calls to <literal>VOLATILE</literal> functions).
Currently, subqueries and generated columns are not allowed in
<literal>WHERE</literal> expressions, and the evaluation does not see
any changes made by the <command>COPY</command> itself (this matters
when the expression contains calls to <literal>VOLATILE</literal>
functions).
</para>
</listitem>