PostgreSQL tsrange -- overlap ignores equivalent ranges?

Question

I have a query in my Rails app that looks like this:

# Returns any records whose period intersect the specified time
# @see https://www.postgresql.org/docs/9.3/static/rangetypes.html
# @see https://www.postgresql.org/docs/9.3/static/functions-range.html
# @note The '()' means exclude both sides of the range
#
# @param period_start [DateTime,Time] Start of the range
# @param period_end [DateTime,Time] End of the range
scope :overlapping, ->(period_start, period_end) {
  where(
    "#{table_name}.period && tsrange(:period_start, :period_end, '()')",
    period_start: Time.at(period_start.to_i), # Caps precision to the second
    period_end: Time.at(period_end.to_i) # Caps precision to the second
  ).distinct
}

However, the problem here is that any records who have the SAME period as the range created by period_start and period_end are not returned. Why is that? I thought overlap checked if there was any intersection at all?

Answer 1

However, the problem here is that any records who have the SAME period as the range created by period_start and period_end are not returned.

That's not true. Not sure what your problem is, but that's not it.

SELECT
  tsrange(x,y),
  tsrange(x,y) && tsrange(x,y) AS overlaps
FROM ( VALUES
  ('yesterday'::timestamp, 'today'::timestamp)
) AS t(x,y);
                    tsrange                    | overlaps 
-----------------------------------------------+----------
 ["2017-04-24 00:00:00","2017-04-25 00:00:00") | t
(1 row)