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On 11/25/2014 12:49 PM, Tom Lane wrote:
> While fooling around with the array_agg(anyarray) patch, I noted
> that dblink_get_connections() returns NULL if there are no active
> connections. It seems like an empty array might be a saner
> definition --- thoughts?
(Sorry for the slow response -- was traveling all day yesterday)
The original patch introducing this function is seen here:
http://www.postgresql.org/message-id/44C50F4A.7050708@joeconway.com
and committed by me here:
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=52a3ed9fac32e16f6061cbc49046c0bd97f8f77a
In particular, the original author said:
8<-------------------------
Added functions:
[...]
dblink_get_connections() List all open dblink connections by name. Returns a comma separated string of all
connectionnames. Takes no params
Example: SELECT string_to_array(dblink_get_connections(), ',');
8<-------------------------
He really did not specify what the return value should be if there are
no connections. Somewhere between submission and commit I changed that
to return an array rather than comma separated string.
To be honest I have no idea why I did not make it an empty array
instead of a NULL in that case, but that does make more sense to me
now that you mention it. Might cause some breakage for people
depending on that though...
Joe
- --
Joe Conway
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