From 766176fe241907c4e5fde42d9395121c3ce4ac02 Mon Sep 17 00:00:00 2001
From: Darafei Praliaskouski <me@komzpa.net>
Date: Sun, 21 Apr 2019 12:58:43 +0000
Subject: [PATCH] Reallocate Union state in aggregate context.

References #4382


git-svn-id: http://svn.osgeo.org/postgis/trunk@17403 b70326c6-7e19-0410-871a-916f4a2858ee
---
 postgis/lwgeom_geos.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/postgis/lwgeom_geos.c b/postgis/lwgeom_geos.c
index 3718fe92c..6f56963d9 100644
--- a/postgis/lwgeom_geos.c
+++ b/postgis/lwgeom_geos.c
@@ -593,7 +593,9 @@ Datum pgis_geometry_union_transfn(PG_FUNCTION_ARGS)
 			if (state->ngeoms > state->alen)
 			{
 				state->alen *= 2;
+				MemoryContext old = MemoryContextSwitchTo(aggcontext);
 				state->geoms = repalloc(state->geoms, state->alen);
+				MemoryContextSwitchTo(old);
 			}
 
 			state->geoms[curgeom] = g;
-- 
2.40.0