From: Sandro Santilli <strk@keybit.net>
Date: Mon, 19 Mar 2012 12:07:39 +0000 (+0000)
Subject: ST_SnapToGrid: retain type on empty return (#1695)
X-Git-Tag: 2.0.0beta4~5
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e8263f680724d515c04305e98dc4cd989704c1cc;p=postgis

ST_SnapToGrid: retain type on empty return (#1695)

git-svn-id: http://svn.osgeo.org/postgis/trunk@9516 b70326c6-7e19-0410-871a-916f4a2858ee
---

diff --git a/postgis/lwgeom_functions_analytic.c b/postgis/lwgeom_functions_analytic.c
index eee1d740d..3d2f78c51 100644
--- a/postgis/lwgeom_functions_analytic.c
+++ b/postgis/lwgeom_functions_analytic.c
@@ -473,7 +473,7 @@ lwcollection_grid(LWCOLLECTION *coll, gridspec *grid)
 		if ( g ) geoms[ngeoms++] = g;
 	}
 
-	if ( ! ngeoms ) return lwcollection_construct_empty(COLLECTIONTYPE, coll->srid, 0, 0);
+	if ( ! ngeoms ) return lwcollection_construct_empty(coll->type, coll->srid, 0, 0);
 
 	return lwcollection_construct(coll->type, coll->srid,
 	                              NULL, ngeoms, geoms);
diff --git a/regress/tickets.sql b/regress/tickets.sql
index 4f4c24bbc..5eac147fc 100644
--- a/regress/tickets.sql
+++ b/regress/tickets.sql
@@ -628,5 +628,8 @@ WITH inp AS ( SELECT
  'POINT(-176 -22)'::geography as p
 ) SELECT '#1596', ST_Summary(ST_Intersection(a,p)) FROM inp;
 
+-- #1695
+SELECT '#1695', ST_AsEWKT(ST_SnapToGrid('MULTIPOLYGON(((0 0, 10 0, 10 10, 0 10, 0 0)))'::geometry, 20));
+
 -- Clean up
 DELETE FROM spatial_ref_sys;
diff --git a/regress/tickets_expected b/regress/tickets_expected
index 4bd17f237..7a5d15c6a 100644
--- a/regress/tickets_expected
+++ b/regress/tickets_expected
@@ -209,3 +209,4 @@ NOTICE:  SRID value -1 converted to the officially unknown SRID value 0
 #1596.6|public.road_pg.roads_geom SRID changed to 0
 #1596.7|0
 #1596|Point[BG]
+#1695|MULTIPOLYGON EMPTY