2013-12-17 Emre Hasegeli <emre@hasegeli.com>:
> Query planner never chooses to use the index for the operators which
> the index is particularly useful because selectivity estimation functions
> are missing. I am planning to work on them.
Attached patch adds selectivity estimation functions for the overlap and
adjacent operators. Other operators need a bit more work. I want to send it
before to get some feedback.
