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diff --git a/sql/sql_alloc.h b/sql/sql_alloc.h
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+#ifndef SQL_ALLOC_INCLUDED
+#define SQL_ALLOC_INCLUDED
+/* Copyright (c) 2000, 2012, Oracle and/or its affiliates.
+ Copyright (c) 2017, 2018, MariaDB Corporation.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
+
+#include <my_sys.h> /* alloc_root, MEM_ROOT, TRASH */
+
+THD *thd_get_current_thd();
+
+/* mysql standard class memory allocator */
+
+class Sql_alloc
+{
+public:
+ static void *operator new(size_t size) throw ()
+ {
+ return thd_alloc(thd_get_current_thd(), size);
+ }
+ static void *operator new[](size_t size) throw ()
+ {
+ return thd_alloc(thd_get_current_thd(), size);
+ }
+ static void *operator new[](size_t size, MEM_ROOT *mem_root) throw ()
+ { return alloc_root(mem_root, size); }
+ static void *operator new(size_t size, MEM_ROOT *mem_root) throw()
+ { return alloc_root(mem_root, size); }
+ static void operator delete(void *ptr, size_t size) { TRASH_FREE(ptr, size); }
+ static void operator delete(void *, MEM_ROOT *){}
+ static void operator delete[](void *, MEM_ROOT *)
+ { /* never called */ }
+ static void operator delete[](void *ptr, size_t size) { TRASH_FREE(ptr, size); }
+#ifdef HAVE_valgrind
+ bool dummy_for_valgrind;
+ inline Sql_alloc() :dummy_for_valgrind(0) {}
+#endif
+};
+#endif /* SQL_ALLOC_INCLUDED */