It's the default value(partition):
# grep exclusion postgresql.conf
#constraint_exclusion = partition    # on, off, or partition

btw, I'm on postgresql 9.2.4

在 2014/7/24 1:35, Douglas J Hunley 写道:

On Wed, Jul 23, 2014 at 6:21 AM, Rural Hunter <ruralhunter@gmail.com> wrote:
What's wrong and how can I improve the planning performance?

What is constraint exclusion set to?


--
Douglas J Hunley (doug.hunley@gmail.com)