diff --git a/src/backend/optimizer/util/pathnode.c b/src/backend/optimizer/util/pathnode.c
index fca96eb..99592e6 100644
--- a/src/backend/optimizer/util/pathnode.c
+++ b/src/backend/optimizer/util/pathnode.c
@@ -28,6 +28,7 @@
 #include "parser/parsetree.h"
 #include "utils/lsyscache.h"
 #include "utils/selfuncs.h"
+#include "utils/memutils.h"
 
 
 typedef enum
@@ -1450,10 +1451,16 @@ create_unique_path(PlannerInfo *root, RelOptInfo *rel, Path *subpath,
 		return NULL;
 
 	/*
-	 * We must ensure path struct and subsidiary data are allocated in main
-	 * planning context; otherwise GEQO memory management causes trouble.
+	 * When called during GEQO join planning, we are in a short-lived memory
+	 * context.  We must make sure that the path and any subsidiary data
+	 * structures created for a baserel survive the GEQO cycle, else the
+	 * baserel is trashed for future GEQO cycles.  On the other hand, when we
+	 * are creating those for a joinrel during GEQO, we don't want them to
+	 * clutter the main planning context.  Upshot is that the best solution is
+	 * to explicitly allocate memory in the same context the given RelOptInfo
+	 * is in.
 	 */
-	oldcontext = MemoryContextSwitchTo(root->planner_cxt);
+	oldcontext = MemoryContextSwitchTo(GetMemoryChunkContext(rel));
 
 	pathnode = makeNode(UniquePath);