On 4 April 2018 at 07:46, Justin Pryzby <pry...@telsasoft.com> wrote: > TLDR: even with "faster pruning" patch, pg11dev open()+lseek() every file > backing every table being queried, even for those partitions eventually > "excluded".
Yeah, this will no doubt be due to the fact that we still build RelOptInfos in the planner for all partitions, so we're still doing get_relation_info() and estimate_rel_size() for each of those. It might be possible to delay that call until we know we're going to need the partition. I imagine we wouldn't need to know the size of the relation until after set_rel_sizes, but I've not checked. -- David Rowley http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
