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Doc: Update FDW documentation about direct foreign table modification.

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1. Commit 7086be6e3 should have documented the limitation that the direct
   modification is disabled when WCO constraints are present, but didn't,
   which is definitely my fault.  Update the documentation (Postgres 9.6
   onwards).

2. Commit fc22b6623 should have documented the limitation that the direct
   modification is disabled when generated columns are defined, but
   didn't.  Update the documentation (Postgres 12 onwards).

Author: Etsuro Fujita
Discussion: https://postgr.es/m/CAPmGK14AYCPunLb6TRz1CQsW5Le01Z2ox8LSOKH0P-cOVDcQRA%40mail.gmail.com
This commit is contained in:
Etsuro Fujita
2019-09-18 18:50:00 +09:00
parent 48770492c3
commit f9f2fda796
2 changed files with 8 additions and 6 deletions
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6
doc/src/sgml/postgres-fdw.sgml
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@ -504,9 +504,9 @@
sending the whole query to the remote server if there are no query
<literal>WHERE</literal> clauses that cannot be sent to the remote server,
no local joins for the query, no row-level local <literal>BEFORE</literal> or
<literal>AFTER</literal> triggers on the target table, and no
<literal>CHECK OPTION</literal> constraints from parent views.
In <command>UPDATE</command>,
<literal>AFTER</literal> triggers or stored generated columns on the target
table, and no <literal>CHECK OPTION</literal> constraints from parent
views. In <command>UPDATE</command>,
expressions to assign to target columns must use only built-in data types,
<literal>IMMUTABLE</literal> operators, or <literal>IMMUTABLE</literal> functions,
to reduce the risk of misexecution of the query.