From: Bborie Park <bkpark at ucdavis.edu>
Date: Wed, 17 Oct 2012 14:29:42 +0000 (+0000)
Subject: Add fallback method of getting maximum extent for extent constraint.
X-Git-Tag: 2.1.0beta2~517
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c9e436d70dd18372dfd6919d2ae2b3d437db31a9;p=postgis

Add fallback method of getting maximum extent for extent constraint.
Ticket is #2050

git-svn-id: http://svn.osgeo.org/postgis/trunk@10455 b70326c6-7e19-0410-871a-916f4a2858ee
---

diff --git a/raster/rt_pg/rtpostgis.sql.in.c b/raster/rt_pg/rtpostgis.sql.in.c
index 1d496a557..23fe8b188 100644
--- a/raster/rt_pg/rtpostgis.sql.in.c
+++ b/raster/rt_pg/rtpostgis.sql.in.c
@@ -5896,8 +5896,18 @@ CREATE OR REPLACE FUNCTION _add_raster_constraint_extent(rastschema name, rastta
 		BEGIN
 			EXECUTE sql INTO attr;
 		EXCEPTION WHEN OTHERS THEN
-			RAISE NOTICE 'Unable to get the extent of a sample raster';
-			RETURN FALSE;
+			RAISE NOTICE 'Unable to get the extent of a sample raster. Attempting memory efficient (slower) approach';
+
+			sql := 'SELECT st_ashexewkb(st_convexhull(st_memunion(st_convexhull('
+				|| quote_ident($3)
+				|| ')))) FROM '
+				|| fqtn;
+			BEGIN
+				EXECUTE sql INTO attr;
+			EXCEPTION WHEN OTHERS THEN
+				RAISE NOTICE 'Still unable to get the extent of a sample raster. Cannot add extent constraint';
+				RETURN FALSE;
+			END;
 		END;
 
 		sql := 'ALTER TABLE ' || fqtn