From 0941e560850d54160c24778fa66b605714fd5012 Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Mon, 9 Aug 2021 21:18:50 +0200
Subject: [PATCH] src/mongo/db/exec/plan_stats.h: fix build with gcc
 11

Fix the following build failure with gcc 11:

In file included from src/mongo/db/query/plan_cache.h:36,
                 from src/mongo/db/catalog/collection_info_cache.h:33,
                 from src/mongo/db/catalog/collection.h:42,
                 from src/mongo/db/exec/requires_collection_stage.h:32,
                 from src/mongo/db/exec/delete.h:32,
                 from src/mongo/db/query/internal_plans.h:33,
                 from src/mongo/db/query/internal_plans.cpp:32:
src/mongo/db/exec/plan_stats.h:214:10: error: 'optional' in namespace 'std' does not name a template type
  214 |     std::optional<std::string> replanReason;
      |          ^~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/8c0875fa413923504515a83d8b679366418c2444

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Upstream status: already fixed by
https://github.com/mongodb/mongo/commit/e78b2bf6eaa0c43bd76dbb841add167b443d2bb0]
---
 src/mongo/db/exec/plan_stats.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mongo/db/exec/plan_stats.h b/src/mongo/db/exec/plan_stats.h
index 43053e27be..813e4edc9e 100644
--- a/src/mongo/db/exec/plan_stats.h
+++ b/src/mongo/db/exec/plan_stats.h
@@ -31,6 +31,7 @@
 
 #include <cstdint>
 #include <cstdlib>
+#include <optional>
 #include <string>
 #include <vector>
 
-- 
2.30.2