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Fujii Masao abecdbc6af doc: Clarify COPY FROM WHERE expression restrictions 
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
2026-07-08 12:45:20 +09:00
..
src doc: Clarify COPY FROM WHERE expression restrictions 2026-07-08 12:45:20 +09:00
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