edi...@edsiohio.com writes:
> PostgreSQL version: 9.0.2
> ...
> That said, I would humbly suggest that the documentation for the
> PQconnectdbParams function omits certain details.  Notably, the function
> will return NULL if you pass in a keywords array with an unrecognized
> keyword.

This is a known bug that was fixed in 9.0.4.  When I try it now, I get a
PGconn object back, with status CONNECTION_BAD, and PQerrorMessage returns
        invalid connection option "host_addr"
which was the intended behavior all along, but there was a typo in 9.0;
see
http://git.postgresql.org/gitweb/?p=postgresql.git&a=commitdiff&h=672def62259354f28000e8cfb97b6668192369c2

In theory at least, you should only get a NULL back if there's
insufficient memory to create a PGconn object at all.

                        regards, tom lane

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