Single geometry versions of ST_MaxDistance and ST_LongestLine

[komzpa]

Sometimes you need to calculate MaxDistance over a MultiPoint you got by collecting some inputs, a longest diagonal of a polygon or something similar. In this case a single-argument of ST_MaxDistance or ST_LongestLine will be beneficial.

[nicklas]

You mean something like

CREATE OR REPLACE FUNCTION public.st_maxdistance(
    geom1 geometry)
  RETURNS double precision AS
	'SELECT ST_maxdistance($1, $1)'
  LANGUAGE sql IMMUTABLE
  COST 100;

[komzpa]

yes, exactly. plus documentation, plus check qualifiers (_PARALLEL).