Return the value span ignoring the potential gaps

valueSpan(tnumber) → numspan

SELECT valueSpan(tint '{[1@2001-01-01, 1@2001-01-03), [4@2001-01-03, 6@2001-01-05]}');
-- [1,7)
SELECT valueSpan(tfloat '{1@2001-01-01, 2@2001-01-03, 3@2001-01-05}');
-- [1,3])

Return the values of the temporal number or geometry as a set

valueSet(tnumber, tgeo) → {numset,geoset}

SELECT valueSet(tint '[1@2001-01-01, 2@2001-01-03]');
-- {1, 2}
SELECT valueSet(tfloat '{[1@2001-01-01, 2@2001-01-03), [3@2001-01-03, 4@2001-01-05)}');
-- {1, 2, 3, 4}
SELECT asText(valueSet(tgeompoint '{[Point(0 0)@2001-01-01, Point(0 1)@2001-01-02),
  [Point(0 1)@2001-01-03, Point(1 1)@2001-01-04)}'));
-- {"POINT(0 0)", "POINT(1 1)", "POINT(0 1)"}
SELECT asText(valueSet(tgeography 
  '{[Point(0 0)@2001-01-01, Linestring(0 0,1 1)@2001-01-02],
    [Point(1 1)@2001-01-03, Linestring(0 0,1 1)@2001-01-04]}'));
-- {"POINT(0 0)", "LINESTRING(0 0,1 1)", "POINT(1 1)"}

Return the minimum or maximum value

minValue(torder) → base

maxValue(torder) → base

The functions do not take into account whether the bounds are inclusive or not.

SELECT minValue(tfloat '{1@2001-01-01, 2@2001-01-03, 3@2001-01-05}');
-- 1
SELECT maxValue(tfloat '{[1@2001-01-01, 2@2001-01-03), [3@2001-01-03, 5@2001-01-05)}');
-- 5

Return the instant with the minimum or maximum value

minInstant(torder) → base

maxInstant(torder) → base

The function does not take into account whether the bounds are inclusive or not. If several instants have the minimum value, the first one is returned.

SELECT minInstant(tfloat '{1@2001-01-01, 2@2001-01-03, 3@2001-01-05}');
-- 1@2001-01-01
SELECT maxInstant(tfloat '{[1@2001-01-01, 2@2001-01-03), [3@2001-01-03, 5@2001-01-05)}');
-- 5@2001-01-05