From 0fae7f98da323af2a67e5c2fc112de6ff9502551 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Fri, 31 Mar 2023 00:54:05 +0300
Subject: [PATCH] mdbx: fix reset of comparison functions on change MainDB
 flags (backport).

---
 src/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/core.c b/src/core.c
index add874c8..f41ad8e0 100644
--- a/src/core.c
+++ b/src/core.c
@@ -20327,6 +20327,10 @@ static int mdbx_dbi_bind(MDBX_txn *txn, const MDBX_dbi dbi, unsigned user_flags,
       /* make sure flags changes get committed */
       txn->mt_dbs[dbi].md_flags = user_flags & DB_PERSISTENT_FLAGS;
       txn->mt_flags |= MDBX_TXN_DIRTY;
+      /* обнуляем компараторы для установки в соответствии с флагами,
+       * либо заданных пользователем */
+      txn->mt_dbxs[dbi].md_cmp = nullptr;
+      txn->mt_dbxs[dbi].md_dcmp = nullptr;
     } else {
       return /* FIXME: return extended info */ MDBX_INCOMPATIBLE;
     }