diff options
| author | Tom Lane | 2021-12-13 22:33:32 +0000 |
|---|---|---|
| committer | Tom Lane | 2021-12-13 22:33:32 +0000 |
| commit | c5c192d7bdfa78f19e735610488b1cc5ad6e41cc (patch) | |
| tree | e7d931fdbe4f11798408ca28ce7ff931e829b401 /doc/src | |
| parent | 3f323956128ff8589ce4d3a14e8b950837831803 (diff) | |
Implement poly_distance().
geo_ops.c contains half a dozen functions that are just stubs throwing
ERRCODE_FEATURE_NOT_SUPPORTED. Since it's been like that for more
than twenty years, there's clearly not a lot of interest in filling in
the stubs. However, I'm uncomfortable with deleting poly_distance(),
since every other geometric type supports a distance-to-another-object-
of-the-same-type function. We can easily add this capability by
cribbing from poly_overlap() and path_distance().
It's possible that the (existing) test case for this will show some
numeric instability, but hopefully the buildfarm will expose it if so.
In passing, improve the documentation to try to explain why polygons
are distinct from closed paths in the first place.
Discussion: https://postgr.es/m/3426566.1638832718@sss.pgh.pa.us
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/datatype.sgml | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml index 6929f3bb183..0932c812da5 100644 --- a/doc/src/sgml/datatype.sgml +++ b/doc/src/sgml/datatype.sgml @@ -3562,8 +3562,9 @@ SELECT person.name, holidays.num_weeks FROM person, holidays <para> Polygons are represented by lists of points (the vertexes of the - polygon). Polygons are very similar to closed paths, but are - stored differently and have their own set of support routines. + polygon). Polygons are very similar to closed paths; the essential + difference is that a polygon is considered to include the area + within it, while a path is not. </para> <para> |