From beb49f0d53d6c372b0a21750ad362363aed21361 Mon Sep 17 00:00:00 2001
From: Halil Ozan Akgul <hozanakgul@gmail.com>
Date: Mon, 16 Aug 2021 12:46:22 +0300
Subject: [PATCH] Updates AlternativeSubPlan comment in ruleutils_14.c

Relevant PG commit:
41efb8340877e8ffd0023bb6b2ef22ffd1ca014d
---
 src/backend/distributed/deparser/ruleutils_14.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/backend/distributed/deparser/ruleutils_14.c b/src/backend/distributed/deparser/ruleutils_14.c
index 2fe4b13b3..ec4ee679b 100644
--- a/src/backend/distributed/deparser/ruleutils_14.c
+++ b/src/backend/distributed/deparser/ruleutils_14.c
@@ -5143,7 +5143,12 @@ get_rule_expr(Node *node, deparse_context *context,
 				AlternativeSubPlan *asplan = (AlternativeSubPlan *) node;
 				ListCell   *lc;
 
-				/* As above, this can only happen during EXPLAIN */
+				/*
+				 * This case cannot be reached in normal usage, since no
+				 * AlternativeSubPlan can appear either in parsetrees or
+				 * finished plan trees.  We keep it just in case somebody
+				 * wants to use this code to print planner data structures.
+				 */
 				appendStringInfoString(buf, "(alternatives: ");
 				foreach(lc, asplan->subplans)
 				{