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doc: Add note about the server name of postgres_fdw_get_connections() returns.

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Previously the document didn't mention the case where
postgres_fdw_get_connections() returns NULL in server_name column.
Users might be confused about why NULL was returned.

This commit adds the note that, in postgres_fdw_get_connections(),
the server name of an invalid connection will be NULL if the server is dropped.

Suggested-by: Zhijie Hou
Author: Bharath Rupireddy
Reviewed-by: Zhijie Hou, Fujii Masao
Discussion: https://postgr.es/m/e7ddd14e96444fce88e47a709c196537@G08CNEXMBPEKD05.g08.fujitsu.local
This commit is contained in:
Fujii Masao 2021-01-19 00:56:10 +09:00
parent ed43677e20
commit ee79a548e7
1 changed files with 3 additions and 1 deletions
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doc/src/sgml/postgres-fdw.sgml
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@ -493,7 +493,9 @@ OPTIONS (ADD password_required 'false');
each connection is valid or not. <literal>false</literal> is returned each connection is valid or not. <literal>false</literal> is returned
if the foreign server connection is used in the current local if the foreign server connection is used in the current local
transaction but its foreign server or user mapping is changed or transaction but its foreign server or user mapping is changed or
dropped, and then such invalid connection will be closed at dropped (Note that server name of an invalid connection will be
<literal>NULL</literal> if the server is dropped),
and then such invalid connection will be closed at
the end of that transaction. <literal>true</literal> is returned the end of that transaction. <literal>true</literal> is returned
otherwise. If there are no open connections, no record is returned. otherwise. If there are no open connections, no record is returned.
Example usage of the function: Example usage of the function: