Remove misleading comment from pathnodes.h.

As of commit e5253fdc, it is no longer true that the leader always
executes the subplan of a Gather Merge node.  Remove comment to that
effect.

Back-patch to 11.

Discussion: https://postgr.es/m/CA%2BhUKGJEaZJYezXAOutuiWT%2BfxCA44%2BoKtVPAND2ubLiigR%3D-w%40mail.gmail.com

diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h
index e61c1a2a2958ba7a3fa41eb0747e2ef1980090dc..ffeb3eb1fee3ff5bd2e9c001d28b7d5024b9b297 100644 (file)
--- a/src/include/nodes/relation.h
+++ b/src/include/nodes/relation.h
@@ -1416,8 +1416,7 @@ typedef struct GatherPath
 
 /*
  * GatherMergePath runs several copies of a plan in parallel and collects
- * the results, preserving their common sort order.  For gather merge, the
- * parallel leader always executes the plan too, so we don't need single_copy.
+ * the results, preserving their common sort order.
  */
 typedef struct GatherMergePath
 {