Merge 10.5 into 10.6

62 files changed, 1345 insertions, 967 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 64af450d29f..37899f37958 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,8 +8,7 @@ MariaDB Server has a vibrant community contributing in a wide range of areas. Th
 -   [maria-developers mailing list](http://launchpad.net/~maria-developers)
 -   [maria-discuss mailing list](http://launchpad.net/~maria-discuss)
 -   [maria-docs mailing list](http://launchpad.net/~maria-docs)
--   ircs://chat.freenode.net/maria ([see the IRC page on the Knowledge Base](https://mariadb.com/kb/en/meta/irc-chat-servers-and-zulip-instance/)  for help with IRC).
--   The MariaDB Foundation and MariaDB Corporation have a presence on Reddit, Twitter, Facebook and Google Plus. See the  [social media page](https://mariadb.com/kb/en/mariadb/social-media/).
+-   The MariaDB Foundation and MariaDB Corporation have a presence on Reddit, Twitter and Facebook. See the  [social media page](https://mariadb.com/kb/en/mariadb/social-media/).
 
 ### Help document MariaDB
 ----
@@ -36,7 +35,7 @@ You’re very welcome to support MariaDB Server as an individual, or talk your c
 
 ### Live QA for beginner contributors
 ----
-MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip and IRC.
+MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip.
 From 8:00 to 10:00 UTC on Mondays, and 10:00 to 12:00 UTC on Thursdays, anyone can ask any questions they’d like,
 and a live developer will be available to assist.
 New contributors can ask questions any time, but we will provide immediate feedback during that interval.
diff --git a/README.md b/README.md
index f17a882d66e..58dbf105fb9 100644
--- a/README.md
+++ b/README.md
@@ -39,11 +39,10 @@ Help
 More help is available from the Maria Discuss mailing list
 https://launchpad.net/~maria-discuss, MariaDB's Zulip
 instance, https://mariadb.zulipchat.com/ 
-and the #maria IRC channel on Freenode.
 
 Live QA for beginner contributors
 ----
-MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip and IRC.
+MariaDB has a dedicated time each week when we answer new contributor questions live on Zulip.
 From 8:00 to 10:00 UTC on Mondays, and 10:00 to 12:00 UTC on Thursdays,
 anyone can ask any questions they’d like, and a live developer will be available to assist.
 
diff --git a/cmake/cpack_rpm.cmake b/cmake/cpack_rpm.cmake
index 5f954c7a1fe..bba9238664b 100644
--- a/cmake/cpack_rpm.cmake
+++ b/cmake/cpack_rpm.cmake
@@ -245,6 +245,7 @@ ELSEIF(RPM MATCHES "(rhel|centos)8")
   ALTERNATIVE_NAME("server" "mariadb-server-utils")
   ALTERNATIVE_NAME("shared" "mariadb-connector-c" ${MARIADB_CONNECTOR_C_VERSION}-1)
   ALTERNATIVE_NAME("shared" "mariadb-connector-c-config" ${MARIADB_CONNECTOR_C_VERSION}-1)
+  ALTERNATIVE_NAME("devel" "mariadb-connector-c-devel" ${MARIADB_CONNECTOR_C_VERSION}-1)
   SETA(CPACK_RPM_client_PACKAGE_PROVIDES "mariadb-galera = 3:%{version}-%{release}")
   SETA(CPACK_RPM_common_PACKAGE_PROVIDES "mariadb-galera-common = 3:%{version}-%{release}")
   SETA(CPACK_RPM_common_PACKAGE_REQUIRES "MariaDB-shared")
@@ -257,6 +258,12 @@ ELSEIF(RPM MATCHES "sles")
     "mariadb-server = %{version}-%{release}"
   )
 ENDIF()
+
+# MDEV-24629, we need it outside of ELSIFs
+IF(RPM MATCHES "fedora3[234]")
+  ALTERNATIVE_NAME("common" "mariadb-connector-c-config" ${MARIADB_CONNECTOR_C_VERSION}-1)
+ENDIF()
+
 SET(PYTHON_SHEBANG "/usr/bin/python3" CACHE STRING "python shebang")
 
 # If we want to build build MariaDB-shared-compat,
diff --git a/extra/mariabackup/datasink.cc b/extra/mariabackup/datasink.cc
index 29bdc061014..a576526d7ff 100644
--- a/extra/mariabackup/datasink.cc
+++ b/extra/mariabackup/datasink.cc
@@ -23,7 +23,6 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
 #include "common.h"
 #include "datasink.h"
 #include "ds_compress.h"
-#include "ds_archive.h"
 #include "ds_xbstream.h"
 #include "ds_local.h"
 #include "ds_stdout.h"
@@ -45,13 +44,6 @@ ds_create(const char *root, ds_type_t type)
 	case DS_TYPE_LOCAL:
 		ds = &datasink_local;
 		break;
-	case DS_TYPE_ARCHIVE:
-#ifdef HAVE_LIBARCHIVE
-		ds = &datasink_archive;
-#else
-		die("mariabackup was built without libarchive support");
-#endif
-		break;
 	case DS_TYPE_XBSTREAM:
 		ds = &datasink_xbstream;
 		break;
diff --git a/extra/mariabackup/datasink.h b/extra/mariabackup/datasink.h
index 5c82556b9ba..4bede4ec9e7 100644
--- a/extra/mariabackup/datasink.h
+++ b/extra/mariabackup/datasink.h
@@ -63,7 +63,6 @@ static inline int dummy_remove(const char *) {
 typedef enum {
 	DS_TYPE_STDOUT,
 	DS_TYPE_LOCAL,
-	DS_TYPE_ARCHIVE,
 	DS_TYPE_XBSTREAM,
 	DS_TYPE_COMPRESS,
 	DS_TYPE_ENCRYPT,
diff --git a/extra/mariabackup/ds_archive.cc b/extra/mariabackup/ds_archive.cc
deleted file mode 100644
index 3a5081119b3..00000000000
--- a/extra/mariabackup/ds_archive.cc
+++ /dev/null
@@ -1,282 +0,0 @@
-/******************************************************
-Copyright (c) 2013 Percona LLC and/or its affiliates.
-
-Streaming implementation for XtraBackup.
-
-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 Street, Fifth Floor, Boston, MA  02110-1335  USA
-
-*******************************************************/
-
-#include <my_global.h>
-#include <my_base.h>
-#include <archive.h>
-#include <archive_entry.h>
-#include "common.h"
-#include "datasink.h"
-
-#if ARCHIVE_VERSION_NUMBER < 3000000
-#define archive_write_add_filter_none(X) archive_write_set_compression_none(X)
-#define archive_write_free(X) archive_write_finish(X)
-#endif
-
-typedef struct {
-	struct archive	*archive;
-	ds_file_t	*dest_file;
-	pthread_mutex_t	mutex;
-} ds_archive_ctxt_t;
-
-typedef struct {
-	struct archive_entry	*entry;
-	ds_archive_ctxt_t	*archive_ctxt;
-} ds_archive_file_t;
-
-
-/***********************************************************************
-General archive interface */
-
-static ds_ctxt_t *archive_init(const char *root);
-static ds_file_t *archive_open(ds_ctxt_t *ctxt, const char *path,
-			      MY_STAT *mystat);
-static int archive_write(ds_file_t *file, const void *buf, size_t len);
-static int archive_close(ds_file_t *file);
-static void archive_deinit(ds_ctxt_t *ctxt);
-
-datasink_t datasink_archive = {
-	&archive_init,
-	&archive_open,
-	&archive_write,
-	&archive_close,
-	&dummy_remove,
-	&archive_deinit
-};
-
-static
-int
-my_archive_open_callback(struct archive *a __attribute__((unused)),
-		      void *data __attribute__((unused)))
-{
-	return ARCHIVE_OK;
-}
-
-static
-ssize_t
-my_archive_write_callback(struct archive *a __attribute__((unused)),
-		       void *data, const void *buffer, size_t length)
-{
-	ds_archive_ctxt_t	*archive_ctxt;
-
-	archive_ctxt = (ds_archive_ctxt_t *) data;
-
-	xb_ad(archive_ctxt != NULL);
-	xb_ad(archive_ctxt->dest_file != NULL);
-
-	if (!ds_write(archive_ctxt->dest_file, buffer, length)) {
-		return length;
-	}
-	return -1;
-}
-
-static
-int
-my_archive_close_callback(struct archive *a __attribute__((unused)),
-			  void *data __attribute__((unused)))
-{
-	return ARCHIVE_OK;
-}
-
-static
-ds_ctxt_t *
-archive_init(const char *root __attribute__((unused)))
-{
-	ds_ctxt_t		*ctxt;
-	ds_archive_ctxt_t	*archive_ctxt;
-	struct archive		*a;
-
-	ctxt = my_malloc(sizeof(ds_ctxt_t) + sizeof(ds_archive_ctxt_t),
-			 MYF(MY_FAE));
-	archive_ctxt = (ds_archive_ctxt_t *)(ctxt + 1);
-
-	if (pthread_mutex_init(&archive_ctxt->mutex, NULL)) {
-		msg("archive_init: pthread_mutex_init() failed.\n");
-		goto err;
-	}
-
-	a = archive_write_new();
-	if (a == NULL) {
-		msg("archive_write_new() failed.\n");
-		goto err;
-	}
-
-	archive_ctxt->archive = a;
-	archive_ctxt->dest_file = NULL;
-
-        if(archive_write_add_filter_none(a) != ARCHIVE_OK ||
-	    archive_write_set_format_pax_restricted(a) != ARCHIVE_OK ||
-	    /* disable internal buffering so we don't have to flush the
-	    output in xtrabackup */
-	    archive_write_set_bytes_per_block(a, 0) != ARCHIVE_OK) {
-		msg("failed to set libarchive archive options: %s\n",
-		    archive_error_string(a));
-                archive_write_free(a);
-		goto err;
-	}
-
-	if (archive_write_open(a, archive_ctxt, my_archive_open_callback,
-			       my_archive_write_callback,
-			       my_archive_close_callback) != ARCHIVE_OK) {
-		msg("cannot open output archive.\n");
-		return NULL;
-	}
-
-	ctxt->ptr = archive_ctxt;
-
-	return ctxt;
-
-err:
-	my_free(ctxt);
-	return NULL;
-}
-
-static
-ds_file_t *
-archive_open(ds_ctxt_t *ctxt, const char *path, MY_STAT *mystat)
-{
-	ds_archive_ctxt_t	*archive_ctxt;
-	ds_ctxt_t		*dest_ctxt;
-	ds_file_t		*file;
-	ds_archive_file_t	*archive_file;
-
-	struct archive		*a;
-	struct archive_entry	*entry;
-
-	xb_ad(ctxt->pipe_ctxt != NULL);
-	dest_ctxt = ctxt->pipe_ctxt;
-
-	archive_ctxt = (ds_archive_ctxt_t *) ctxt->ptr;
-
-	pthread_mutex_lock(&archive_ctxt->mutex);
-	if (archive_ctxt->dest_file == NULL) {
-		archive_ctxt->dest_file = ds_open(dest_ctxt, path, mystat);
-		if (archive_ctxt->dest_file == NULL) {
-			return NULL;
-		}
-	}
-	pthread_mutex_unlock(&archive_ctxt->mutex);
-
-	file = (ds_file_t *) my_malloc(sizeof(ds_file_t) +
-				       sizeof(ds_archive_file_t),
-				       MYF(MY_FAE));
-
-	archive_file = (ds_archive_file_t *) (file + 1);
-
-	a = archive_ctxt->archive;
-
-	entry = archive_entry_new();
-	if (entry == NULL) {
-		msg("archive_entry_new() failed.\n");
-		goto err;
-	}
-
-	archive_entry_set_size(entry, mystat->st_size);
-	archive_entry_set_mode(entry, 0660);
-	archive_entry_set_filetype(entry, AE_IFREG);
-	archive_entry_set_pathname(entry, path);
-	archive_entry_set_mtime(entry, mystat->st_mtime, 0);
-
-	archive_file->entry = entry;
-	archive_file->archive_ctxt = archive_ctxt;
-
-	if (archive_write_header(a, entry) != ARCHIVE_OK) {
-		msg("archive_write_header() failed.\n");
-		archive_entry_free(entry);
-		goto err;
-	}
-
-	file->ptr = archive_file;
-	file->path = archive_ctxt->dest_file->path;
-
-	return file;
-
-err:
-	if (archive_ctxt->dest_file) {
-		ds_close(archive_ctxt->dest_file);
-		archive_ctxt->dest_file = NULL;
-	}
-	my_free(file);
-
-	return NULL;
-}
-
-static
-int
-archive_write(ds_file_t *file, const void *buf, size_t len)
-{
-	ds_archive_file_t	*archive_file;
-	struct archive		*a;
-
-	archive_file = (ds_archive_file_t *) file->ptr;
-
-	a = archive_file->archive_ctxt->archive;
-
-	xb_ad(archive_file->archive_ctxt->dest_file != NULL);
-	if (archive_write_data(a, buf, len) < 0) {
-		msg("archive_write_data() failed: %s (errno = %d)\n",
-		    archive_error_string(a), archive_errno(a));
-		return 1;
-	}
-
-	return 0;
-}
-
-static
-int
-archive_close(ds_file_t *file)
-{
-	ds_archive_file_t	*archive_file;
-	int			rc = 0;
-
-	archive_file = (ds_archive_file_t *)file->ptr;
-
-	archive_entry_free(archive_file->entry);
-
-	my_free(file);
-
-	return rc;
-}
-
-static
-void
-archive_deinit(ds_ctxt_t *ctxt)
-{
-	struct archive *a;
-	ds_archive_ctxt_t	*archive_ctxt;
-
-	archive_ctxt = (ds_archive_ctxt_t *) ctxt->ptr;
-
-	a = archive_ctxt->archive;
-
-	if (archive_write_close(a) != ARCHIVE_OK) {
-		msg("archive_write_close() failed.\n");
-	}
-	archive_write_free(a);
-
-	if (archive_ctxt->dest_file) {
-		ds_close(archive_ctxt->dest_file);
-		archive_ctxt->dest_file = NULL;
-	}
-
-	pthread_mutex_destroy(&archive_ctxt->mutex);
-
-	my_free(ctxt);
-}
diff --git a/extra/mariabackup/ds_archive.h b/extra/mariabackup/ds_archive.h
deleted file mode 100644
index f419fca0c9f..00000000000
--- a/extra/mariabackup/ds_archive.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/******************************************************
-Copyright (c) 2013 Percona LLC and/or its affiliates.
-
-Streaming interface for XtraBackup.
-
-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 Street, Fifth Floor, Boston, MA  02110-1335  USA
-
-*******************************************************/
-
-#ifndef DS_ARCHIVE_H
-#define DS_ARCHIVE_H
-
-#include "datasink.h"
-
-extern datasink_t datasink_archive;
-
-#endif
diff --git a/extra/mariabackup/ds_xbstream.cc b/extra/mariabackup/ds_xbstream.cc
index 4d165ad11d9..3bf8bd086c2 100644
--- a/extra/mariabackup/ds_xbstream.cc
+++ b/extra/mariabackup/ds_xbstream.cc
@@ -126,14 +126,20 @@ xbstream_open(ds_ctxt_t *ctxt, const char *path, MY_STAT *mystat)
 	pthread_mutex_lock(&stream_ctxt->mutex);
 	if (stream_ctxt->dest_file == NULL) {
 		stream_ctxt->dest_file = ds_open(dest_ctxt, path, mystat);
-		if (stream_ctxt->dest_file == NULL) {
-			return NULL;
-		}
 	}
 	pthread_mutex_unlock(&stream_ctxt->mutex);
+	if (stream_ctxt->dest_file == NULL) {
+		return NULL;
+	}
 
 	file = (ds_file_t *) my_malloc(PSI_NOT_INSTRUMENTED,
-                        sizeof(ds_file_t) + sizeof(ds_stream_file_t), MYF(MY_FAE));
+				       sizeof(ds_file_t) +
+				       sizeof(ds_stream_file_t),
+				       MYF(MY_FAE));
+	if (!file) {
+		msg("my_malloc() failed.");
+		goto err;
+	}
 	stream_file = (ds_stream_file_t *) (file + 1);
 
 	xbstream = stream_ctxt->xbstream;
diff --git a/libmariadb b/libmariadb
-Subproject 2ca0c22fd36c1b34115352e22c5f6b7d23c2c04
+Subproject ffa3451fa511ad27164356bd8c620032eba6551
diff --git a/libmysqld/libmysql.c b/libmysqld/libmysql.c
index 7a0843d32e5..6c7e0b3b812 100644
--- a/libmysqld/libmysql.c
+++ b/libmysqld/libmysql.c
@@ -3966,6 +3966,7 @@ static my_bool is_binary_compatible(enum enum_field_types type1,
 
 static my_bool setup_one_fetch_function(MYSQL_BIND *param, MYSQL_FIELD *field)
 {
+  my_bool field_is_unsigned;
   DBUG_ENTER("setup_one_fetch_function");
 
   /* Setup data copy functions for the different supported types */
@@ -4042,6 +4043,7 @@ static my_bool setup_one_fetch_function(MYSQL_BIND *param, MYSQL_FIELD *field)
 
   /* Setup skip_result functions (to calculate max_length) */
   param->skip_result= skip_result_fixed;
+  field_is_unsigned= MY_TEST(field->flags & UNSIGNED_FLAG);
   switch (field->type) {
   case MYSQL_TYPE_NULL: /* for dummy binds */
     param->pack_length= 0;
@@ -4049,23 +4051,23 @@ static my_bool setup_one_fetch_function(MYSQL_BIND *param, MYSQL_FIELD *field)
     break;
   case MYSQL_TYPE_TINY:
     param->pack_length= 1;
-    field->max_length= 4;                     /* as in '-127' */
+    field->max_length= field_is_unsigned ? 3 : 4; /* '255' and '-127' */
     break;
   case MYSQL_TYPE_YEAR:
   case MYSQL_TYPE_SHORT:
     param->pack_length= 2;
-    field->max_length= 6;                     /* as in '-32767' */
+    field->max_length= field_is_unsigned ? 5 : 6; /* 65536 and '-32767' */
     break;
   case MYSQL_TYPE_INT24:
-    field->max_length= 9;  /* as in '16777216' or in '-8388607' */
+    field->max_length=  8;  /* '16777216' or in '-8388607' */
     param->pack_length= 4;
     break;
   case MYSQL_TYPE_LONG:
-    field->max_length= 11;                    /* '-2147483647' */
+    field->max_length= field_is_unsigned ? 10 : 11; /* '4294967295' and '-2147483647' */
     param->pack_length= 4;
     break;
   case MYSQL_TYPE_LONGLONG:
-    field->max_length= 21;                    /* '18446744073709551616' */
+    field->max_length= 20; /* '18446744073709551616' or -9223372036854775808 */
     param->pack_length= 8;
     break;
   case MYSQL_TYPE_FLOAT:
diff --git a/man/mysqldump.1 b/man/mysqldump.1
index e3206e612f7..ad4b167c7b8 100644
--- a/man/mysqldump.1
+++ b/man/mysqldump.1
@@ -2279,7 +2279,7 @@ servers \- remote (federated) servers as \fBCREATE SERVER\fR\&.
 .sp -1
 .IP \(bu 2.3
 .\}
-stats \- statistics tables, InnoDB and Engine Independent Table Statistics (EITS), are dumped as \fBREPLACE INTO\fR (or \fBINSERT IGNORE\fR if \fB\-\-insert\-into\fR is specified) statements without (re)creating tables\&.
+stats \- statistics tables, InnoDB and Engine Independent Table Statistics (EITS), are dumped as \fBREPLACE INTO\fR (or \fBINSERT IGNORE\fR if \fB\-\-insert\-ignore\fR is specified) statements without (re)creating tables\&.
 .RE
 .RS 4
 .ie n \{\
@@ -2289,17 +2289,17 @@ stats \- statistics tables, InnoDB and Engine Independent Table Statistics (EITS
 .sp -1
 .IP \(bu 2.3
 .\}
-timezones \- timezone related system tables dumped as \fBREPLACE INTO\fR (or \fBINSERT IGNORE\fR if \fB\-\-insert\-into\fR is specified) statements without (re)creating tables\&.
+timezones \- timezone related system tables dumped as \fBREPLACE INTO\fR (or \fBINSERT IGNORE\fR if \fB\-\-insert\-ignore\fR is specified) statements without (re)creating tables\&.
 .RE
 .sp
-The format of the output is affected by \fB\-\-replace\fR and \fB\-\-insert\-into\fR\&. The \fB\-\-replace\fR option will output \fBCREATE OR REPLACE\fR
+The format of the output is affected by \fB\-\-replace\fR and \fB\-\-insert\-ignore\fR\&. The \fB\-\-replace\fR option will output \fBCREATE OR REPLACE\fR
 forms of SQL, and also \fBDROP IF EXISTS\fR prior to \fBCREATE\fR, if a \fBCREATE OR REPLACE\fR option isn't available.
 .sp
 With \fB\-\-system=user\fR (or \fBall\fR), and \fB\-\-replace\fR, SQL is generated to generate an error if attempting to import the dump with a connection user that is being replaced within the dump\&.
 .sp
-The \fB\-\-insert\-into\fR option will cause \fBCREATE IF NOT EXIST\fR forms of SQL to generated if available.
+The \fB\-\-insert\-ignore\fR option will cause \fBCREATE IF NOT EXIST\fR forms of SQL to generated if available.
 .sp
-For stats, and timezones, \fB\-\-replace\fR and \fB\-\-insert\-into\fR have the usual effects.
+For stats, and timezones, \fB\-\-replace\fR and \fB\-\-insert\-ignore\fR have the usual effects.
 .sp
 Enabling specific options here will cause the relevant tables in the mysql database to be ignored when dumping the mysql database or \fB\-\-all\-databases\fR\&.
 .sp
diff --git a/mysql-test/main/alias.result b/mysql-test/main/alias.result
index 0d14607f613..266991afbec 100644
--- a/mysql-test/main/alias.result
+++ b/mysql-test/main/alias.result
@@ -223,16 +223,16 @@ disconnect c1;
 #
 create or replace table t1 (a int);
 create or replace table t2 (b int);
-insert into t1 values(1<<30),(1<<29);
+insert into t1 values(111111111),(-2147483648);
 insert into t2 values(1),(2);
 select t1.a as a1 from t1 as t1,t2 order by t2.b,t1.a;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def	test	t1	t1	a	a1	3	11	10	Y	32768	0	63
+def	test	t1	t1	a	a1	3	11	11	Y	32768	0	63
 a1
-536870912
-1073741824
-536870912
-1073741824
+-2147483648
+111111111
+-2147483648
+111111111
 drop table t1,t2;
 #
 # End of 10.4 tests
diff --git a/mysql-test/main/alias.test b/mysql-test/main/alias.test
index 2408509ba10..881cc34d6c6 100644
--- a/mysql-test/main/alias.test
+++ b/mysql-test/main/alias.test
@@ -231,7 +231,7 @@ disconnect c1;
 --echo #
 create or replace table t1 (a int);
 create or replace table t2 (b int);
-insert into t1 values(1<<30),(1<<29);
+insert into t1 values(111111111),(-2147483648);
 insert into t2 values(1),(2);
 --enable_metadata
 select t1.a as a1 from t1 as t1,t2 order by t2.b,t1.a;
diff --git a/mysql-test/main/mdev-504.result b/mysql-test/main/mdev-504.result
deleted file mode 100644
index e34e57be6ed..00000000000
--- a/mysql-test/main/mdev-504.result
+++ /dev/null
@@ -1,25 +0,0 @@
-set @save_use_stat_tables=@@global.use_stat_tables;
-SET GLOBAL net_write_timeout = 900;
-CREATE TABLE A (
-pk INTEGER AUTO_INCREMENT PRIMARY KEY,
-fdate DATE
-) ENGINE=MyISAM;
-CREATE PROCEDURE p_analyze()
-BEGIN
-DECLARE attempts INTEGER DEFAULT 100;
-wl_loop: WHILE attempts > 0 DO
-ANALYZE TABLE A;
-SET attempts = attempts - 1;
-END WHILE wl_loop;
-END |
-CREATE FUNCTION rnd3() RETURNS INT
-BEGIN
-RETURN ROUND(3 * RAND() + 0.5);
-END |
-SET GLOBAL use_stat_tables = PREFERABLY;
-connection default;
-DROP TABLE A;
-DROP PROCEDURE p_analyze;
-DROP FUNCTION rnd3;
-SET GLOBAL use_stat_tables = @save_use_stat_tables;
-SET GLOBAL net_write_timeout = DEFAULT;
diff --git a/mysql-test/main/mdev-504.test b/mysql-test/main/mdev-504.test
deleted file mode 100644
index 277b5a038a0..00000000000
--- a/mysql-test/main/mdev-504.test
+++ /dev/null
@@ -1,82 +0,0 @@
---source include/not_valgrind.inc
---source include/no_protocol.inc
-
-set @save_use_stat_tables=@@global.use_stat_tables;
-
-SET GLOBAL net_write_timeout = 900; 
-
-CREATE TABLE A (
-  pk INTEGER AUTO_INCREMENT PRIMARY KEY,
-  fdate DATE
-) ENGINE=MyISAM;
-
---delimiter |
-
-CREATE PROCEDURE p_analyze()
-BEGIN
-  DECLARE attempts INTEGER DEFAULT 100;
-  wl_loop: WHILE attempts > 0 DO
-    ANALYZE TABLE A;
-    SET attempts = attempts - 1;
-  END WHILE wl_loop;
-END |
-
-CREATE FUNCTION rnd3() RETURNS INT
-BEGIN
-  RETURN ROUND(3 * RAND() + 0.5);
-END |
-
---delimiter ;
-
-SET GLOBAL use_stat_tables = PREFERABLY;  
-
---let $trial = 100
-
---disable_query_log
---disable_result_log
---disable_warnings
-while ($trial)
-{
-
-  --connect (con1,localhost,root,,)
-  --send CALL p_analyze()
-
-  --connect (con2,localhost,root,,)
-  --send CALL p_analyze()
-
-  --let $run = 100
-
-  while ($run)
-  {
-    --connect (con3,localhost,root,,)
-  
-    let $query = `SELECT CASE rnd3() 
-      WHEN 1 THEN 'INSERT INTO A (pk) VALUES (NULL)'
-      WHEN 2 THEN 'DELETE FROM A LIMIT 1'
-      ELSE 'UPDATE IGNORE A SET fdate = 2 LIMIT 1' END`;
-    --eval $query
-    --disconnect con3
-    --dec $run
-  }
-
-  --connection con2
-  --reap
-  --disconnect con2
-  --connection con1
-  --reap
-  --disconnect con1
-
-  --dec $trial
-}
-
---enable_query_log
---enable_result_log
---enable_warnings
-
-# Cleanup
---connection default
-DROP TABLE A;
-DROP PROCEDURE p_analyze;
-DROP FUNCTION rnd3;
-SET GLOBAL use_stat_tables = @save_use_stat_tables;
-SET GLOBAL net_write_timeout = DEFAULT;
diff --git a/mysql-test/main/truncate_notembedded.result b/mysql-test/main/truncate_notembedded.result
index 18a01c684e7..67beb79707c 100644
--- a/mysql-test/main/truncate_notembedded.result
+++ b/mysql-test/main/truncate_notembedded.result
@@ -5,7 +5,7 @@
 CREATE TABLE t1 (a INT) ENGINE=MyISAM;
 LOCK TABLE t1 READ;
 connect  con1,localhost,root,,test;
-SET SESSION max_session_mem_used= 65536;
+SET SESSION max_session_mem_used= 45500;
 LOCK TABLE t1 WRITE;
 connection default;
 SELECT * FROM t1;
@@ -13,7 +13,6 @@ a
 UNLOCK TABLES;
 connection con1;
 TRUNCATE TABLE t1;
-ERROR HY000: The MariaDB server is running with the --max-thread-mem-used=65536 option so it cannot execute this statement
 disconnect con1;
 connection default;
 DROP TABLE t1;
diff --git a/mysql-test/main/truncate_notembedded.test b/mysql-test/main/truncate_notembedded.test
index 7e186c8f7d5..c1fab2d3609 100644
--- a/mysql-test/main/truncate_notembedded.test
+++ b/mysql-test/main/truncate_notembedded.test
@@ -9,7 +9,7 @@ CREATE TABLE t1 (a INT) ENGINE=MyISAM;
 LOCK TABLE t1 READ;
 
 --connect (con1,localhost,root,,test)
-SET SESSION max_session_mem_used= 65536;
+SET SESSION max_session_mem_used= 45500;
 --send
   LOCK TABLE t1 WRITE;
 
@@ -19,7 +19,10 @@ UNLOCK TABLES;
 
 --connection con1
 --reap
---error ER_OPTION_PREVENTS_STATEMENT
+# This may work or fail as different servers uses different amount of
+# memory and the statement may work or not. What is important is that we
+# don't get a crash here!
+--error 0,ER_OPTION_PREVENTS_STATEMENT
 TRUNCATE TABLE t1;
 
 --disconnect con1
diff --git a/mysql-test/suite/encryption/r/innodb_encryption.result b/mysql-test/suite/encryption/r/innodb_encryption.result
index 4ede82ebd38..3b1552be4be 100644
--- a/mysql-test/suite/encryption/r/innodb_encryption.result
+++ b/mysql-test/suite/encryption/r/innodb_encryption.result
@@ -19,7 +19,7 @@ innodb_system
 # Success!
 # Now turn off encryption and wait for threads to decrypt everything
 SET GLOBAL innodb_encrypt_tables = off;
-# Wait max 10 min for key encryption threads to encrypt all spaces
+# Wait max 10 min for key encryption threads to decrypt all spaces
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0
 AND NAME NOT LIKE 'innodb_undo%' AND NAME NOT LIKE 'mysql/innodb_%_stats' AND NAME NOT LIKE 'mysql/transaction_registry';
 NAME
diff --git a/mysql-test/suite/encryption/t/innodb_encryption.test b/mysql-test/suite/encryption/t/innodb_encryption.test
index 1c8d200458a..2b0b2b8d7fb 100644
--- a/mysql-test/suite/encryption/t/innodb_encryption.test
+++ b/mysql-test/suite/encryption/t/innodb_encryption.test
@@ -33,7 +33,7 @@ AND NAME NOT LIKE 'innodb_undo%' AND NAME NOT LIKE 'mysql/innodb_%_stats' AND NA
 --echo # Now turn off encryption and wait for threads to decrypt everything
 SET GLOBAL innodb_encrypt_tables = off;
 
---echo # Wait max 10 min for key encryption threads to encrypt all spaces
+--echo # Wait max 10 min for key encryption threads to decrypt all spaces
 --let $wait_timeout= 600
 --let $wait_condition=SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 --source include/wait_condition.inc
diff --git a/mysql-test/suite/galera/r/galera_schema.result b/mysql-test/suite/galera/r/galera_schema.result
new file mode 100644
index 00000000000..24a4099c94d
--- /dev/null
+++ b/mysql-test/suite/galera/r/galera_schema.result
@@ -0,0 +1,114 @@
+connection node_2;
+connection node_1;
+CREATE TABLE IF NOT EXISTS wsrep_cluster
+(
+cluster_uuid CHAR(36) PRIMARY KEY,
+view_id BIGINT NOT NULL,
+view_seqno BIGINT NOT NULL,
+protocol_version INT NOT NULL,
+capabilities INT NOT NULL
+) ENGINE=InnoDB;
+CREATE TABLE IF NOT EXISTS wsrep_cluster_members
+(
+node_uuid CHAR(36) PRIMARY KEY,
+cluster_uuid CHAR(36) NOT NULL,
+node_name CHAR(32) NOT NULL,
+node_incoming_address VARCHAR(256) NOT NULL
+) ENGINE=InnoDB;
+CREATE TABLE IF NOT EXISTS wsrep_cluster_members_history
+(
+node_uuid CHAR(36) PRIMARY KEY,
+cluster_uuid CHAR(36) NOT NULL,
+last_view_id BIGINT NOT NULL,
+last_view_seqno BIGINT NOT NULL,
+node_name CHAR(32) NOT NULL,
+node_incoming_address VARCHAR(256) NOT NULL
+) ENGINE=InnoDB;
+CREATE TABLE IF NOT EXISTS wsrep_streaming_log
+(
+node_uuid CHAR(36),
+trx_id BIGINT,
+seqno BIGINT,
+flags INT NOT NULL,
+frag LONGBLOB NOT NULL,
+PRIMARY KEY (node_uuid, trx_id, seqno)
+) ENGINE=InnoDB;
+DELETE FROM wsrep_cluster;
+DELETE FROM wsrep_cluster_members;
+ALTER TABLE wsrep_cluster STATS_PERSISTENT=0;
+ALTER TABLE wsrep_cluster_members STATS_PERSISTENT=0;
+ALTER TABLE wsrep_cluster_members_history STATS_PERSISTENT=0;
+ALTER TABLE wsrep_streaming_log STATS_PERSISTENT=0;
+SHOW CREATE TABLE wsrep_cluster;
+Table	Create Table
+wsrep_cluster	CREATE TABLE `wsrep_cluster` (
+  `cluster_uuid` char(36) NOT NULL,
+  `view_id` bigint(20) NOT NULL,
+  `view_seqno` bigint(20) NOT NULL,
+  `protocol_version` int(11) NOT NULL,
+  `capabilities` int(11) NOT NULL,
+  PRIMARY KEY (`cluster_uuid`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
+SHOW CREATE TABLE wsrep_cluster_members;
+Table	Create Table
+wsrep_cluster_members	CREATE TABLE `wsrep_cluster_members` (
+  `node_uuid` char(36) NOT NULL,
+  `cluster_uuid` char(36) NOT NULL,
+  `node_name` char(32) NOT NULL,
+  `node_incoming_address` varchar(256) NOT NULL,
+  PRIMARY KEY (`node_uuid`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
+SHOW CREATE TABLE wsrep_cluster_members_history;
+Table	Create Table
+wsrep_cluster_members_history	CREATE TABLE `wsrep_cluster_members_history` (
+  `node_uuid` char(36) NOT NULL,
+  `cluster_uuid` char(36) NOT NULL,
+  `last_view_id` bigint(20) NOT NULL,
+  `last_view_seqno` bigint(20) NOT NULL,
+  `node_name` char(32) NOT NULL,
+  `node_incoming_address` varchar(256) NOT NULL,
+  PRIMARY KEY (`node_uuid`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
+SHOW CREATE TABLE wsrep_streaming_log;
+Table	Create Table
+wsrep_streaming_log	CREATE TABLE `wsrep_streaming_log` (
+  `node_uuid` char(36) NOT NULL,
+  `trx_id` bigint(20) NOT NULL,
+  `seqno` bigint(20) NOT NULL,
+  `flags` int(11) NOT NULL,
+  `frag` longblob NOT NULL,
+  PRIMARY KEY (`node_uuid`,`trx_id`,`seqno`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
+SHOW CREATE TABLE mysql.wsrep_cluster;
+Table	Create Table
+wsrep_cluster	CREATE TABLE `wsrep_cluster` (
+  `cluster_uuid` char(36) NOT NULL,
+  `view_id` bigint(20) NOT NULL,
+  `view_seqno` bigint(20) NOT NULL,
+  `protocol_version` int(11) NOT NULL,
+  `capabilities` int(11) NOT NULL,
+  PRIMARY KEY (`cluster_uuid`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
+SHOW CREATE TABLE mysql.wsrep_cluster_members;
+Table	Create Table
+wsrep_cluster_members	CREATE TABLE `wsrep_cluster_members` (
+  `node_uuid` char(36) NOT NULL,
+  `cluster_uuid` char(36) NOT NULL,
+  `node_name` char(32) NOT NULL,
+  `node_incoming_address` varchar(256) NOT NULL,
+  PRIMARY KEY (`node_uuid`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
+SHOW CREATE TABLE mysql.wsrep_streaming_log;
+Table	Create Table
+wsrep_streaming_log	CREATE TABLE `wsrep_streaming_log` (
+  `node_uuid` char(36) NOT NULL,
+  `trx_id` bigint(20) NOT NULL,
+  `seqno` bigint(20) NOT NULL,
+  `flags` int(11) NOT NULL,
+  `frag` longblob NOT NULL,
+  PRIMARY KEY (`node_uuid`,`trx_id`,`seqno`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
+DROP TABLE wsrep_cluster;
+DROP TABLE wsrep_cluster_members;
+DROP TABLE wsrep_cluster_members_history;
+DROP TABLE wsrep_streaming_log;
diff --git a/mysql-test/suite/galera/t/galera_schema.test b/mysql-test/suite/galera/t/galera_schema.test
new file mode 100644
index 00000000000..a3ee814c393
--- /dev/null
+++ b/mysql-test/suite/galera/t/galera_schema.test
@@ -0,0 +1,61 @@
+--source include/galera_cluster.inc
+
+CREATE TABLE IF NOT EXISTS wsrep_cluster
+(
+  cluster_uuid CHAR(36) PRIMARY KEY,
+  view_id BIGINT NOT NULL,
+  view_seqno BIGINT NOT NULL,
+  protocol_version INT NOT NULL,
+  capabilities INT NOT NULL
+) ENGINE=InnoDB;
+
+CREATE TABLE IF NOT EXISTS wsrep_cluster_members
+(
+  node_uuid CHAR(36) PRIMARY KEY,
+  cluster_uuid CHAR(36) NOT NULL,
+  node_name CHAR(32) NOT NULL,
+  node_incoming_address VARCHAR(256) NOT NULL
+) ENGINE=InnoDB;
+
+CREATE TABLE IF NOT EXISTS wsrep_cluster_members_history
+(
+  node_uuid CHAR(36) PRIMARY KEY,
+  cluster_uuid CHAR(36) NOT NULL,
+  last_view_id BIGINT NOT NULL,
+  last_view_seqno BIGINT NOT NULL,
+  node_name CHAR(32) NOT NULL,
+  node_incoming_address VARCHAR(256) NOT NULL
+) ENGINE=InnoDB;
+
+CREATE TABLE IF NOT EXISTS wsrep_streaming_log
+(
+  node_uuid CHAR(36),
+  trx_id BIGINT,
+  seqno BIGINT,
+  flags INT NOT NULL,
+  frag LONGBLOB NOT NULL,
+  PRIMARY KEY (node_uuid, trx_id, seqno)
+) ENGINE=InnoDB;
+
+DELETE FROM wsrep_cluster;
+DELETE FROM wsrep_cluster_members;
+
+ALTER TABLE wsrep_cluster STATS_PERSISTENT=0;
+ALTER TABLE wsrep_cluster_members STATS_PERSISTENT=0;
+ALTER TABLE wsrep_cluster_members_history STATS_PERSISTENT=0;
+ALTER TABLE wsrep_streaming_log STATS_PERSISTENT=0;
+
+SHOW CREATE TABLE wsrep_cluster;
+SHOW CREATE TABLE wsrep_cluster_members;
+SHOW CREATE TABLE wsrep_cluster_members_history;
+SHOW CREATE TABLE wsrep_streaming_log;
+
+SHOW CREATE TABLE mysql.wsrep_cluster;
+SHOW CREATE TABLE mysql.wsrep_cluster_members;
+#SHOW CREATE TABLE mysql.wsrep_cluster_members_history;
+SHOW CREATE TABLE mysql.wsrep_streaming_log;
+
+DROP TABLE wsrep_cluster;
+DROP TABLE wsrep_cluster_members;
+DROP TABLE wsrep_cluster_members_history;
+DROP TABLE wsrep_streaming_log;
diff --git a/mysql-test/suite/galera_3nodes/r/galera_wsrep_schema.result b/mysql-test/suite/galera_3nodes/r/galera_wsrep_schema.result
index ba01eab0e26..f51eb815cd5 100644
--- a/mysql-test/suite/galera_3nodes/r/galera_wsrep_schema.result
+++ b/mysql-test/suite/galera_3nodes/r/galera_wsrep_schema.result
@@ -14,7 +14,7 @@ wsrep_cluster	CREATE TABLE `wsrep_cluster` (
   `protocol_version` int(11) NOT NULL,
   `capabilities` int(11) NOT NULL,
   PRIMARY KEY (`cluster_uuid`)
-) ENGINE=InnoDB DEFAULT CHARSET=latin1
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
 SHOW CREATE TABLE mysql.wsrep_cluster_members;
 Table	Create Table
 wsrep_cluster_members	CREATE TABLE `wsrep_cluster_members` (
@@ -23,7 +23,7 @@ wsrep_cluster_members	CREATE TABLE `wsrep_cluster_members` (
   `node_name` char(32) NOT NULL,
   `node_incoming_address` varchar(256) NOT NULL,
   PRIMARY KEY (`node_uuid`)
-) ENGINE=InnoDB DEFAULT CHARSET=latin1
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
 SELECT COUNT(*) AS EXPECT_1 FROM mysql.wsrep_cluster;
 EXPECT_1
 1
diff --git a/mysql-test/suite/galera_3nodes/r/galera_wsrep_schema_init.result b/mysql-test/suite/galera_3nodes/r/galera_wsrep_schema_init.result
index 2a29afd62be..d9d3e817bed 100644
--- a/mysql-test/suite/galera_3nodes/r/galera_wsrep_schema_init.result
+++ b/mysql-test/suite/galera_3nodes/r/galera_wsrep_schema_init.result
@@ -14,7 +14,7 @@ wsrep_cluster	CREATE TABLE `wsrep_cluster` (
   `protocol_version` int(11) NOT NULL,
   `capabilities` int(11) NOT NULL,
   PRIMARY KEY (`cluster_uuid`)
-) ENGINE=InnoDB DEFAULT CHARSET=latin1
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
 SHOW CREATE TABLE mysql.wsrep_cluster_members;
 Table	Create Table
 wsrep_cluster_members	CREATE TABLE `wsrep_cluster_members` (
@@ -23,7 +23,7 @@ wsrep_cluster_members	CREATE TABLE `wsrep_cluster_members` (
   `node_name` char(32) NOT NULL,
   `node_incoming_address` varchar(256) NOT NULL,
   PRIMARY KEY (`node_uuid`)
-) ENGINE=InnoDB DEFAULT CHARSET=latin1
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
 SELECT @@sql_safe_updates;
 @@sql_safe_updates
 1
diff --git a/mysql-test/suite/galera_sr/r/GCF-627.result b/mysql-test/suite/galera_sr/r/GCF-627.result
index 65d8c95ad08..7cd2ab63ff3 100644
--- a/mysql-test/suite/galera_sr/r/GCF-627.result
+++ b/mysql-test/suite/galera_sr/r/GCF-627.result
@@ -2,7 +2,6 @@ connection node_2;
 connection node_1;
 connection node_1;
 CREATE TABLE t1 (f1 INTEGER, f2 VARCHAR(10)) ENGINE=InnoDB;
-CREATE TABLE t2 (f1 INTEGER);
 SET SESSION wsrep_trx_fragment_size = 1;
 SET AUTOCOMMIT=OFF;
 START TRANSACTION;
@@ -16,9 +15,10 @@ connect node_1a, 127.0.0.1, root, , test, $NODE_MYPORT_1;
 INSERT INTO t1 VALUES (2);
 ERROR 42S02: Table 'test.t1' doesn't exist
 connection node_1;
-SELECT * FROM mysql.wsrep_streaming_log;
-node_uuid	trx_id	seqno	flags	frag
+SELECT COUNT(*) FROM mysql.wsrep_streaming_log;
+COUNT(*)
+0
 connection node_2;
-SELECT * FROM mysql.wsrep_streaming_log;
-node_uuid	trx_id	seqno	flags	frag
-DROP TABLE t2;
+SELECT COUNT(*) FROM mysql.wsrep_streaming_log;
+COUNT(*)
+0
diff --git a/mysql-test/suite/galera_sr/t/GCF-627.test b/mysql-test/suite/galera_sr/t/GCF-627.test
index ad351eb9da6..6990c12314d 100644
--- a/mysql-test/suite/galera_sr/t/GCF-627.test
+++ b/mysql-test/suite/galera_sr/t/GCF-627.test
@@ -1,9 +1,7 @@
 --source include/galera_cluster.inc
---source include/have_innodb.inc
 
 --connection node_1
 CREATE TABLE t1 (f1 INTEGER, f2 VARCHAR(10)) ENGINE=InnoDB;
-CREATE TABLE t2 (f1 INTEGER);
 
 SET SESSION wsrep_trx_fragment_size = 1;
 SET AUTOCOMMIT=OFF;
@@ -25,11 +23,9 @@ INSERT INTO t1 VALUES (2);
 --let $wait_condition = SELECT COUNT(*) = 0 FROM mysql.wsrep_streaming_log
 --source include/wait_condition.inc
 
-SELECT * FROM mysql.wsrep_streaming_log;
+SELECT COUNT(*) FROM mysql.wsrep_streaming_log;
 
 --connection node_2
 --let $wait_condition = SELECT COUNT(*) = 0 FROM mysql.wsrep_streaming_log
 --source include/wait_condition.inc
-SELECT * FROM mysql.wsrep_streaming_log;
-
-DROP TABLE t2;
+SELECT COUNT(*) FROM mysql.wsrep_streaming_log;
diff --git a/mysql-test/suite/innodb/r/innodb_defrag_stats.result b/mysql-test/suite/innodb/r/innodb_defrag_stats.result
index 4fdcf42faa1..2e7a2ba5197 100644
--- a/mysql-test/suite/innodb/r/innodb_defrag_stats.result
+++ b/mysql-test/suite/innodb/r/innodb_defrag_stats.result
@@ -1,25 +1,32 @@
-select @@global.innodb_stats_persistent;
-@@global.innodb_stats_persistent
-1
-set global innodb_defragment_stats_accuracy = 20;
-CREATE TABLE t1(a INT PRIMARY KEY, b VARCHAR(256), KEY SECOND(a, b))
-ENGINE=INNODB;
+SET GLOBAL innodb_defragment_stats_accuracy = 20;
+DELETE FROM mysql.innodb_index_stats;
+# Create table.
+CREATE TABLE t1 (a INT PRIMARY KEY AUTO_INCREMENT, b VARCHAR(256),
+KEY SECOND(a, b)) ENGINE=INNODB STATS_PERSISTENT=0;
 INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_1_to_1024;
 # Not enough page splits to trigger persistent stats write yet.
-select * from mysql.innodb_index_stats where table_name='t1'
-and stat_name in ('n_page_split','n_pages_freed,n_leaf_pages_defrag');
-database_name	table_name	index_name	last_update	stat_name	stat_value	sample_size	stat_description
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+count(stat_value) = 0
+1
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+count(stat_value) = 0
+1
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
+count(stat_value) = 0
+1
 INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_1025_to_2048;
 # Persistent stats recorded.
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
 count(stat_value) > 0
 1
-select * from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
-database_name	table_name	index_name	last_update	stat_name	stat_value	sample_size	stat_description
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+count(stat_value) = 0
+1
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 count(stat_value) > 0
 1
 # Delete some rows.
+BEGIN;
 delete from t1 where a between 100 * 20 and 100 * 20 + 30;
 delete from t1 where a between 100 * 19 and 100 * 19 + 30;
 delete from t1 where a between 100 * 18 and 100 * 18 + 30;
@@ -40,82 +47,93 @@ delete from t1 where a between 100 * 4 and 100 * 4 + 30;
 delete from t1 where a between 100 * 3 and 100 * 3 + 30;
 delete from t1 where a between 100 * 2 and 100 * 2 + 30;
 delete from t1 where a between 100 * 1 and 100 * 1 + 30;
-# restart
-# Server Restarted
-# Confirm persistent stats still there after restart.
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
+COMMIT;
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
 count(stat_value) > 0
 1
-select * from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
-database_name	table_name	index_name	last_update	stat_name	stat_value	sample_size	stat_description
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+count(stat_value) = 0
+1
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 count(stat_value) > 0
 1
 optimize table t1;
 Table	Op	Msg_type	Msg_text
 test.t1	optimize	status	OK
-select sleep(2);
-sleep(2)
-0
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
 count(stat_value) > 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
 count(stat_value) > 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 count(stat_value) > 0
 1
 set global innodb_defragment_stats_accuracy = 40;
-INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_2049_to_4096;
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
+INSERT INTO t1 (b) SELECT b from t1;
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
 count(stat_value) > 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
 count(stat_value) > 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 count(stat_value) > 0
 1
-INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_4097_to_8192;
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
+INSERT INTO t1 (b) SELECT b from t1;
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
 count(stat_value) > 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
 count(stat_value) > 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 count(stat_value) > 0
 1
 # Table rename should cause stats rename.
 rename table t1 to t2;
-select * from mysql.innodb_index_stats where table_name = 't1';
-database_name	table_name	index_name	last_update	stat_name	stat_value	sample_size	stat_description
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_page_split');
-count(stat_value) > 0
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+count(stat_value) = 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_pages_freed');
-count(stat_value) > 0
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+count(stat_value) = 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_leaf_pages_defrag');
-count(stat_value) > 0
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
+count(stat_value) = 0
 1
-# Drop index should cause stats drop.
-drop index SECOND on t2;
-select * from mysql.innodb_index_stats where table_name = 't2' and index_name = 'SECOND';
-database_name	table_name	index_name	last_update	stat_name	stat_value	sample_size	stat_description
-# restart
-Server Restarted
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_page_split');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t2%' and  stat_name in ('n_page_split');
 count(stat_value) > 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t2%' and  stat_name in ('n_pages_freed');
 count(stat_value) > 0
 1
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t2%' and  stat_name in ('n_leaf_pages_defrag');
 count(stat_value) > 0
 1
+# Drop index should cause stats drop, but will not.
+drop index SECOND on t2;
+SELECT stat_name, stat_value>0 FROM mysql.innodb_index_stats
+WHERE table_name like '%t2%' AND index_name='SECOND';
+stat_name	stat_value>0
+#
+# MDEV-26636: Statistics must not be written for temporary tables
+#
+SET GLOBAL innodb_defragment_stats_accuracy = 1;
+CREATE TEMPORARY TABLE t (a INT PRIMARY KEY, c CHAR(255) NOT NULL)
+ENGINE=InnoDB;
+INSERT INTO t SELECT seq, '' FROM seq_1_to_100;
+# restart
+SELECT * FROM mysql.innodb_index_stats where table_name like '%t1%';
+database_name	table_name	index_name	last_update	stat_name	stat_value	sample_size	stat_description
+SELECT table_name, index_name, stat_name, stat_value>0
+FROM mysql.innodb_index_stats;
+table_name	index_name	stat_name	stat_value>0
+t2	PRIMARY	n_leaf_pages_defrag	1
+t2	PRIMARY	n_leaf_pages_reserved	1
+t2	PRIMARY	n_page_split	1
+t2	PRIMARY	n_pages_freed	0
 # Clean up
+ALTER TABLE t2 STATS_PERSISTENT=1;
 DROP TABLE t2;
-select * from mysql.innodb_index_stats where table_name = 't2';
+SELECT * FROM mysql.innodb_index_stats;
 database_name	table_name	index_name	last_update	stat_name	stat_value	sample_size	stat_description
diff --git a/mysql-test/suite/innodb/r/undo_truncate.result b/mysql-test/suite/innodb/r/undo_truncate.result
index ad236bdecd4..fbfd061c9cc 100644
--- a/mysql-test/suite/innodb/r/undo_truncate.result
+++ b/mysql-test/suite/innodb/r/undo_truncate.result
@@ -1,34 +1,13 @@
-SET @save_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
-SET @save_truncate = @@GLOBAL.innodb_undo_log_truncate;
 SET GLOBAL innodb_undo_log_truncate = 0;
 SET GLOBAL innodb_purge_rseg_truncate_frequency = 1;
-SET @trunc_start=
-(SELECT variable_value FROM information_schema.global_status
-WHERE variable_name = 'innodb_undo_truncations');
 create table t1(keyc int primary key, c char(100)) engine = innodb;
 create table t2(keyc int primary key, c char(100)) engine = innodb;
-CREATE PROCEDURE populate_t1()
-BEGIN
-DECLARE i INT DEFAULT 1;
-while (i <= 20000) DO
-insert into t1 values (i, 'a');
-SET i = i + 1;
-END WHILE;
-END |
-CREATE PROCEDURE populate_t2()
-BEGIN
-DECLARE i INT DEFAULT 1;
-while (i <= 20000) DO
-insert into t2 values (i, 'a');
-SET i = i + 1;
-END WHILE;
-END |
 connect  con1,localhost,root,,;
 begin;
-call populate_t1();
+insert into t1 select seq,'a' from seq_1_to_20000;
 connect  con2,localhost,root,,;
 begin;
-call populate_t2();
+insert into t2 select seq,'a' from seq_1_to_20000;
 connection con1;
 update t1 set c = 'mysql';
 connection con2;
@@ -49,9 +28,6 @@ connection con2;
 commit;
 disconnect con2;
 connection default;
+set global innodb_fast_shutdown=0;
+# restart
 drop table t1, t2;
-drop PROCEDURE populate_t1;
-drop PROCEDURE populate_t2;
-InnoDB		0 transactions not purged
-SET GLOBAL innodb_purge_rseg_truncate_frequency = @save_frequency;
-SET GLOBAL innodb_undo_log_truncate = @save_truncate;
diff --git a/mysql-test/suite/innodb/t/innodb_defrag_stats.test b/mysql-test/suite/innodb/t/innodb_defrag_stats.test
index 248fd24f0c8..13e4579d3d8 100644
--- a/mysql-test/suite/innodb/t/innodb_defrag_stats.test
+++ b/mysql-test/suite/innodb/t/innodb_defrag_stats.test
@@ -1,28 +1,32 @@
 --source include/have_innodb.inc
---source include/have_sequence.inc
---source include/big_test.inc
 --source include/not_valgrind.inc
 --source include/not_embedded.inc
+--source include/have_sequence.inc
+
+SET GLOBAL innodb_defragment_stats_accuracy = 20;
 
-select @@global.innodb_stats_persistent;
-set global innodb_defragment_stats_accuracy = 20;
+DELETE FROM mysql.innodb_index_stats;
+
+--echo # Create table.
+CREATE TABLE t1 (a INT PRIMARY KEY AUTO_INCREMENT, b VARCHAR(256),
+                 KEY SECOND(a, b)) ENGINE=INNODB STATS_PERSISTENT=0;
 
-CREATE TABLE t1(a INT PRIMARY KEY, b VARCHAR(256), KEY SECOND(a, b))
-ENGINE=INNODB;
 INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_1_to_1024;
 
 --echo # Not enough page splits to trigger persistent stats write yet.
-select * from mysql.innodb_index_stats where table_name='t1'
-and stat_name in ('n_page_split','n_pages_freed,n_leaf_pages_defrag');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 
 INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_1025_to_2048;
 
 --echo # Persistent stats recorded.
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
-select * from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 
 --echo # Delete some rows.
+BEGIN;
 let $num_delete = 20;
 while ($num_delete)
 {
@@ -30,58 +34,71 @@ while ($num_delete)
     eval delete from t1 where a between $j and $j + 30;
     dec $num_delete;
 }
+COMMIT;
 
---source include/restart_mysqld.inc
---echo # Server Restarted
-
---echo # Confirm persistent stats still there after restart.
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
-select * from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 
 optimize table t1;
-select sleep(2);
 
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 
 set global innodb_defragment_stats_accuracy = 40;
 
-INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_2049_to_4096;
+INSERT INTO t1 (b) SELECT b from t1;
+
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
 
-INSERT INTO t1 SELECT seq, REPEAT('A', 256) FROM seq_4097_to_8192;
+INSERT INTO t1 (b) SELECT b from t1;
 
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_page_split');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_pages_freed');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't1' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
 
 
 --echo # Table rename should cause stats rename.
 rename table t1 to t2;
-select * from mysql.innodb_index_stats where table_name = 't1';
 
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_page_split');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_pages_freed');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_leaf_pages_defrag');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_page_split');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_pages_freed');
+select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and  stat_name in ('n_leaf_pages_defrag');
+
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t2%' and  stat_name in ('n_page_split');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t2%' and  stat_name in ('n_pages_freed');
+select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t2%' and  stat_name in ('n_leaf_pages_defrag');
 
---echo # Drop index should cause stats drop.
+--echo # Drop index should cause stats drop, but will not.
 drop index SECOND on t2;
 
-select * from mysql.innodb_index_stats where table_name = 't2' and index_name = 'SECOND';
+--sorted_result
+SELECT stat_name, stat_value>0 FROM mysql.innodb_index_stats
+WHERE table_name like '%t2%' AND index_name='SECOND';
+
+--echo #
+--echo # MDEV-26636: Statistics must not be written for temporary tables
+--echo #
+SET GLOBAL innodb_defragment_stats_accuracy = 1;
+CREATE TEMPORARY TABLE t (a INT PRIMARY KEY, c CHAR(255) NOT NULL)
+ENGINE=InnoDB;
+INSERT INTO t SELECT seq, '' FROM seq_1_to_100;
 
 --source include/restart_mysqld.inc
---echo Server Restarted
 
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_page_split');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_pages_freed');
-select count(stat_value) > 0 from mysql.innodb_index_stats where table_name = 't2' and  stat_name in ('n_leaf_pages_defrag');
+SELECT * FROM mysql.innodb_index_stats where table_name like '%t1%';
+
+--sorted_result
+SELECT table_name, index_name, stat_name, stat_value>0
+FROM mysql.innodb_index_stats;
 
 --echo # Clean up
+# DROP TABLE will not touch persistent statistics if the table has none!
+ALTER TABLE t2 STATS_PERSISTENT=1;
 DROP TABLE t2;
 
-select * from mysql.innodb_index_stats where table_name = 't2';
+SELECT * FROM mysql.innodb_index_stats;
diff --git a/mysql-test/suite/innodb/t/undo_truncate.opt b/mysql-test/suite/innodb/t/undo_truncate.opt
new file mode 100644
index 00000000000..f4d78725c6e
--- /dev/null
+++ b/mysql-test/suite/innodb/t/undo_truncate.opt
@@ -0,0 +1 @@
+--innodb-buffer-pool-size=24M
diff --git a/mysql-test/suite/innodb/t/undo_truncate.test b/mysql-test/suite/innodb/t/undo_truncate.test
index d2a4e287305..9601de482b3 100644
--- a/mysql-test/suite/innodb/t/undo_truncate.test
+++ b/mysql-test/suite/innodb/t/undo_truncate.test
@@ -1,16 +1,16 @@
 --source include/have_innodb.inc
 --source include/innodb_page_size.inc
 --source include/have_undo_tablespaces.inc
+--source include/not_embedded.inc
+--source include/have_sequence.inc
+
+--disable_query_log
+call mtr.add_suppression("InnoDB: Difficult to find free blocks in the buffer pool");
+--enable_query_log
 
-SET @save_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
-SET @save_truncate = @@GLOBAL.innodb_undo_log_truncate;
 SET GLOBAL innodb_undo_log_truncate = 0;
 SET GLOBAL innodb_purge_rseg_truncate_frequency = 1;
 
-SET @trunc_start=
-(SELECT variable_value FROM information_schema.global_status
-WHERE variable_name = 'innodb_undo_truncations');
-
 #-----------------------------------------------------------------------------
 #
 # Perform DML action using multiple clients and multiple undo tablespace.
@@ -19,37 +19,14 @@ WHERE variable_name = 'innodb_undo_truncations');
 create table t1(keyc int primary key, c char(100)) engine = innodb;
 create table t2(keyc int primary key, c char(100)) engine = innodb;
 #
-delimiter |;
-CREATE PROCEDURE populate_t1()
-BEGIN
-        DECLARE i INT DEFAULT 1;
-        while (i <= 20000) DO
-                insert into t1 values (i, 'a');
-                SET i = i + 1;
-        END WHILE;
-END |
-delimiter ;|
-#
-delimiter |;
-CREATE PROCEDURE populate_t2()
-BEGIN
-        DECLARE i INT DEFAULT 1;
-        while (i <= 20000) DO
-                insert into t2 values (i, 'a');
-                SET i = i + 1;
-        END WHILE;
-END |
-delimiter ;|
-#
-#
 let DATADIR = `select @@datadir`;
 connect (con1,localhost,root,,);
 begin;
-send call populate_t1();
+send insert into t1 select seq,'a' from seq_1_to_20000;
 
 connect (con2,localhost,root,,);
 begin;
-send call populate_t2();
+send insert into t2 select seq,'a' from seq_1_to_20000;
 
 connection con1; reap; send update t1 set c = 'mysql';
 connection con2; reap; send update t2 set c = 'mysql';
@@ -59,62 +36,25 @@ connection con1; reap; send delete from t1;
 connection con2; reap; delete from t2;
 connection con1; reap;
 
-let CHECKFILE = $MYSQL_TMP_DIR/check.txt;
-perl;
-($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size1)
-	= stat("$ENV{DATADIR}/undo001");
-($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size2)
-	= stat("$ENV{DATADIR}/undo002");
-open(OUT, ">$ENV{CHECKFILE}") || die;
-print OUT "let \$size1='$size1,$size2';\n";
-close(OUT);
-EOF
-
 SET GLOBAL innodb_undo_log_truncate = 1;
 commit; disconnect con1;
 connection con2; commit; disconnect con2;
 
 connection default;
-drop table t1, t2;
-drop PROCEDURE populate_t1;
-drop PROCEDURE populate_t2;
-
---source include/wait_all_purged.inc
 
-# Truncation will normally not occur with innodb_page_size=64k,
-# and occasionally not with innodb_page_size=32k,
-# because the undo log will not grow enough.
-# TODO: For some reason this does not occur on 4k either!
-if (`select @@innodb_page_size IN (8192,16384)`)
-{
-  let $wait_condition = (SELECT variable_value!=@trunc_start
-                         FROM information_schema.global_status
-                         WHERE variable_name = 'innodb_undo_truncations');
-  source include/wait_condition.inc;
-}
+--replace_regex /.*Trx id counter ([0-9]+).*/\1/
+let $trx_before= `SHOW ENGINE INNODB STATUS`;
+let $trx_before= `select substr('$trx_before',9)+2`;
 
---source $CHECKFILE
-perl;
-($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size1)
-	= stat("$ENV{DATADIR}/undo001");
-($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size2)
-	= stat("$ENV{DATADIR}/undo002");
-open(OUT, ">$ENV{CHECKFILE}") || die;
-print OUT "let \$size2='$size1,$size2';\n";
-close(OUT);
-EOF
+set global innodb_fast_shutdown=0;
+--source include/restart_mysqld.inc
+--replace_regex /.*Trx id counter ([0-9]+).*/\1/
+let $trx_after= `SHOW ENGINE INNODB STATUS`;
+let $trx_after= `select substr('$trx_after',9)`;
 
---source $CHECKFILE
---remove_file $CHECKFILE
+drop table t1, t2;
 
-if ($size1 == $size2)
+if ($trx_before != $trx_after)
 {
-  # This fails for innodb_page_size=64k, occasionally also for 32k.
-  if (`select @@innodb_page_size IN (8192,16384)`)
-  {
-    echo Truncation did not happen: $size1;
-  }
+  echo Transaction sequence mismatch: $trx_before != $trx_after;
 }
-
-SET GLOBAL innodb_purge_rseg_truncate_frequency = @save_frequency;
-SET GLOBAL innodb_undo_log_truncate = @save_truncate;
diff --git a/scripts/wsrep_sst_mariabackup.sh b/scripts/wsrep_sst_mariabackup.sh
index 562b9b929f2..54632e5f79b 100644
--- a/scripts/wsrep_sst_mariabackup.sh
+++ b/scripts/wsrep_sst_mariabackup.sh
@@ -949,8 +949,10 @@ then
         tmpdir=$(parse_cnf "$encgroups" 'tmpdir')
         if [ -z "$tmpdir" ]; then
             xtmpdir="$(mktemp -d)"
-        else
+        elif [ "$OS" = 'Linux' ]; then
             xtmpdir=$(mktemp '-d' "--tmpdir=$tmpdir")
+        else
+            xtmpdir=$(TMPDIR="$tmpdir"; mktemp '-d')
         fi
 
         wsrep_log_info "Using '$xtmpdir' as mariabackup temporary directory"
diff --git a/scripts/wsrep_sst_rsync.sh b/scripts/wsrep_sst_rsync.sh
index d90e87b68f2..e16ed75cb16 100644
--- a/scripts/wsrep_sst_rsync.sh
+++ b/scripts/wsrep_sst_rsync.sh
@@ -725,8 +725,10 @@ EOF
             tmpdir=$(parse_cnf '--mysqld|sst' 'tmpdir')
             if [ -z "$tmpdir" ]; then
                tmpfile="$(mktemp)"
-            else
+            elif [ "$OS" = 'Linux' ]; then
                tmpfile=$(mktemp "--tmpdir=$tmpdir")
+            else
+               tmpfile=$(TMPDIR="$tmpdir"; mktemp '-d')
             fi
 
             wsrep_log_info "Extracting binlog files:"
diff --git a/sql/CMakeLists.txt b/sql/CMakeLists.txt
index c50229ada1e..854d6cac8aa 100644
--- a/sql/CMakeLists.txt
+++ b/sql/CMakeLists.txt
@@ -1,5 +1,5 @@
 # Copyright (c) 2006, 2014, Oracle and/or its affiliates.
-# Copyright (c) 2010, 2020, MariaDB Corporation.
+# Copyright (c) 2010, 2021, 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
@@ -65,6 +65,8 @@ ADD_CUSTOM_COMMAND(
   DEPENDS gen_lex_token
 )
 
+FIND_PACKAGE(BISON 2.4)
+
 ADD_CUSTOM_COMMAND(
   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/yy_mariadb.yy
          ${CMAKE_CURRENT_BINARY_DIR}/yy_oracle.yy
@@ -72,6 +74,7 @@ ADD_CUSTOM_COMMAND(
    "-DOUT1=${CMAKE_CURRENT_BINARY_DIR}/yy_oracle.yy"
    "-DOUT2=${CMAKE_CURRENT_BINARY_DIR}/yy_mariadb.yy"
    "-DIN=${CMAKE_CURRENT_SOURCE_DIR}/sql_yacc.yy"
+    "-DBISON_VERSION=${BISON_VERSION}"
    -P ${CMAKE_CURRENT_SOURCE_DIR}/gen_yy_files.cmake
   COMMENT "Building yy_mariadb.yy and yy_oracle.yy from sql_yacc.yy"
   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/sql_yacc.yy
@@ -325,9 +328,6 @@ IF(WITH_MYSQLD_LDFLAGS)
 ENDIF()
 
 
-FIND_PACKAGE(BISON 2.4)
-
-
 # Handle out-of-source build from source package with possibly broken 
 # bison. Copy bison output to from source to build directory, if not already 
 # there
diff --git a/sql/gen_yy_files.cmake b/sql/gen_yy_files.cmake
index da63c72c37c..3ceb60a95de 100644
--- a/sql/gen_yy_files.cmake
+++ b/sql/gen_yy_files.cmake
@@ -5,6 +5,9 @@ file(READ "${IN}" data)
 file(WRITE "${OUT1}" "")
 file(WRITE "${OUT2}" "")
 set(where 0)
+if(NOT(BISON_VERSION VERSION_LESS "3.0.0"))
+  string(REPLACE "\n%pure-parser" "\n%define api.pure" data "${data}")
+endif()
 string(REGEX REPLACE "/\\* sql_yacc\\.yy \\*/" "/* DON'T EDIT THIS FILE. IT'S GENERATED.  EDIT sql_yacc.yy INSTEAD */" data "${data}")
 while(NOT data STREQUAL "")
   string(REGEX MATCH "^(%[ie][^\n]*\n)|((%[^ie\n]|[^%\n])[^\n]*\n)+|\n+" line "${data}")
diff --git a/sql/sql_class.cc b/sql/sql_class.cc
index 954d53b9d72..7c0879af8c9 100644
--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -4929,6 +4929,9 @@ MYSQL_THD create_background_thd()
   thd->set_command(COM_DAEMON);
   thd->system_thread= SYSTEM_THREAD_GENERIC;
   thd->security_ctx->host_or_ip= "";
+  thd->real_id= 0;
+  thd->thread_id= 0;
+  thd->query_id= 0;
   return thd;
 }
 
diff --git a/sql/sql_delete.cc b/sql/sql_delete.cc
index 0a2db2ea93a..e35cf17b182 100644
--- a/sql/sql_delete.cc
+++ b/sql/sql_delete.cc
@@ -631,14 +631,18 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     if (!table->check_virtual_columns_marked_for_read())
     {
       DBUG_PRINT("info", ("Trying direct delete"));
-      if (select && select->cond &&
-          (select->cond->used_tables() == table->map))
+      bool use_direct_delete= !select || !select->cond;
+      if (!use_direct_delete &&
+          (select->cond->used_tables() & ~RAND_TABLE_BIT) == table->map)
       {
         DBUG_ASSERT(!table->file->pushed_cond);
         if (!table->file->cond_push(select->cond))
+        {
+          use_direct_delete= TRUE;
           table->file->pushed_cond= select->cond;
+        }
       }
-      if (!table->file->direct_delete_rows_init())
+      if (use_direct_delete && !table->file->direct_delete_rows_init())
       {
         /* Direct deleting is supported */
         DBUG_PRINT("info", ("Using direct delete"));
diff --git a/sql/sql_update.cc b/sql/sql_update.cc
index 6214b42d56a..f5aec151686 100644
--- a/sql/sql_update.cc
+++ b/sql/sql_update.cc
@@ -754,15 +754,20 @@ int mysql_update(THD *thd,
       !table->check_virtual_columns_marked_for_write())
   {
     DBUG_PRINT("info", ("Trying direct update"));
-    if (select && select->cond &&
-        (select->cond->used_tables() == table->map))
+    bool use_direct_update= !select || !select->cond;
+    if (!use_direct_update &&
+        (select->cond->used_tables() & ~RAND_TABLE_BIT) == table->map)
     {
       DBUG_ASSERT(!table->file->pushed_cond);
       if (!table->file->cond_push(select->cond))
+      {
+        use_direct_update= TRUE;
         table->file->pushed_cond= select->cond;
+      }
     }
 
-    if (!table->file->info_push(INFO_KIND_UPDATE_FIELDS, &fields) &&
+    if (use_direct_update &&
+        !table->file->info_push(INFO_KIND_UPDATE_FIELDS, &fields) &&
         !table->file->info_push(INFO_KIND_UPDATE_VALUES, &values) &&
         !table->file->direct_update_rows_init(&fields))
     {
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index f5a4fc99135..6c1b19446ce 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -75,6 +75,9 @@
 /* warning C4065: switch statement contains 'default' but no 'case' labels */
 #pragma warning (disable : 4065)
 #endif
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-Wunused-label" /* yyexhaustedlab: */
+#endif
 
 int yylex(void *yylval, void *yythd);
 
diff --git a/sql/wsrep_schema.cc b/sql/wsrep_schema.cc
index 9d77577ed42..cc8ec7a5af4 100644
--- a/sql/wsrep_schema.cc
+++ b/sql/wsrep_schema.cc
@@ -1,4 +1,4 @@
-/* Copyright (C) 2015-2019 Codership Oy <info@codership.com>
+/* Copyright (C) 2015-2021 Codership Oy <info@codership.com>
 
    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
@@ -54,7 +54,7 @@ static const std::string create_cluster_table_str=
   "view_seqno BIGINT NOT NULL,"
   "protocol_version INT NOT NULL,"
   "capabilities INT NOT NULL"
-  ") ENGINE=InnoDB";
+  ") ENGINE=InnoDB STATS_PERSISTENT=0";
 
 static const std::string create_members_table_str=
   "CREATE TABLE IF NOT EXISTS " + wsrep_schema_str + "." + members_table_str +
@@ -63,7 +63,7 @@ static const std::string create_members_table_str=
   "cluster_uuid CHAR(36) NOT NULL,"
   "node_name CHAR(32) NOT NULL,"
   "node_incoming_address VARCHAR(256) NOT NULL"
-  ") ENGINE=InnoDB";
+  ") ENGINE=InnoDB STATS_PERSISTENT=0";
 
 #ifdef WSREP_SCHEMA_MEMBERS_HISTORY
 static const std::string cluster_member_history_table_str= "wsrep_cluster_member_history";
@@ -76,7 +76,7 @@ static const std::string create_members_history_table_str=
   "last_view_seqno BIGINT NOT NULL,"
   "node_name CHAR(32) NOT NULL,"
   "node_incoming_address VARCHAR(256) NOT NULL"
-  ") ENGINE=InnoDB";
+  ") ENGINE=InnoDB STATS_PERSISTENT=0";
 #endif /* WSREP_SCHEMA_MEMBERS_HISTORY */
 
 static const std::string create_frag_table_str=
@@ -88,7 +88,7 @@ static const std::string create_frag_table_str=
   "flags INT NOT NULL, "
   "frag LONGBLOB NOT NULL, "
   "PRIMARY KEY (node_uuid, trx_id, seqno)"
-  ") ENGINE=InnoDB";
+  ") ENGINE=InnoDB STATS_PERSISTENT=0";
 
 static const std::string delete_from_cluster_table=
   "DELETE FROM " + wsrep_schema_str + "." + cluster_table_str;
@@ -96,6 +96,26 @@ static const std::string delete_from_cluster_table=
 static const std::string delete_from_members_table=
   "DELETE FROM " + wsrep_schema_str + "." + members_table_str;
 
+/* For rolling upgrade we need to use ALTER. We do not want
+persistent statistics to be collected from these tables. */
+static const std::string alter_cluster_table=
+  "ALTER TABLE " + wsrep_schema_str + "." + cluster_table_str +
+  " STATS_PERSISTENT=0";
+
+static const std::string alter_members_table=
+  "ALTER TABLE " + wsrep_schema_str + "." + members_table_str +
+  " STATS_PERSISTENT=0";
+
+#ifdef WSREP_SCHEMA_MEMBERS_HISTORY
+static const std::string alter_members_history_table=
+  "ALTER TABLE " + wsrep_schema_str + "." + members_history_table_str +
+  " STATS_PERSISTENT=0";
+#endif
+
+static const std::string alter_frag_table=
+  "ALTER TABLE " + wsrep_schema_str + "." + sr_table_str +
+  " STATS_PERSISTENT=0";
+
 namespace Wsrep_schema_impl
 {
 
@@ -675,13 +695,27 @@ int Wsrep_schema::init()
       Wsrep_schema_impl::execute_SQL(thd,
                                      create_members_history_table_str.c_str(),
                                      create_members_history_table_str.size()) ||
+      Wsrep_schema_impl::execute_SQL(thd,
+                                     alter_members_history_table.c_str(),
+                                     alter_members_history_table.size()) ||
 #endif /* WSREP_SCHEMA_MEMBERS_HISTORY */
       Wsrep_schema_impl::execute_SQL(thd,
                                      create_frag_table_str.c_str(),
-                                     create_frag_table_str.size())) {
+                                     create_frag_table_str.size()) ||
+      Wsrep_schema_impl::execute_SQL(thd,
+                                     alter_cluster_table.c_str(),
+                                     alter_cluster_table.size()) ||
+      Wsrep_schema_impl::execute_SQL(thd,
+                                     alter_members_table.c_str(),
+                                     alter_members_table.size()) ||
+      Wsrep_schema_impl::execute_SQL(thd,
+                                     alter_frag_table.c_str(),
+	                             alter_frag_table.size()))
+  {
     ret= 1;
   }
-  else {
+  else
+  {
     ret= 0;
   }
 
diff --git a/storage/innobase/btr/btr0defragment.cc b/storage/innobase/btr/btr0defragment.cc
index 0e21acb4fda..19f6edc7ec7 100644
--- a/storage/innobase/btr/btr0defragment.cc
+++ b/storage/innobase/btr/btr0defragment.cc
@@ -225,6 +225,7 @@ void btr_defragment_save_defrag_stats_if_needed(dict_index_t *index)
 {
 	if (srv_defragment_stats_accuracy != 0 // stats tracking disabled
 	    && index->table->space_id != 0 // do not track system tables
+	    && !index->table->is_temporary()
 	    && index->stat_defrag_modified_counter
 	       >= srv_defragment_stats_accuracy) {
 		dict_stats_defrag_pool_add(index);
diff --git a/storage/innobase/buf/buf0buf.cc b/storage/innobase/buf/buf0buf.cc
index bab95c5453c..4ec6a61ccb9 100644
--- a/storage/innobase/buf/buf0buf.cc
+++ b/storage/innobase/buf/buf0buf.cc
@@ -3390,6 +3390,7 @@ loop:
   /* Delete possible entries for the page from the insert buffer:
   such can exist if the page belonged to an index which was dropped */
   if (page_id < page_id_t{SRV_SPACE_ID_UPPER_BOUND, 0} &&
+      !srv_is_undo_tablespace(page_id.space()) &&
       !recv_recovery_is_on())
     ibuf_merge_or_delete_for_page(nullptr, page_id, zip_size);
 
diff --git a/storage/innobase/buf/buf0flu.cc b/storage/innobase/buf/buf0flu.cc
index 84b0287d535..2107f0af9ae 100644
--- a/storage/innobase/buf/buf0flu.cc
+++ b/storage/innobase/buf/buf0flu.cc
@@ -366,10 +366,12 @@ void buf_page_write_complete(const IORequest &request)
   const bool temp= fsp_is_system_temporary(bpage->id().space());
 
   mysql_mutex_lock(&buf_pool.mutex);
+  mysql_mutex_assert_not_owner(&buf_pool.flush_list_mutex);
   buf_pool.stat.n_pages_written++;
   /* While we do not need any mutex for clearing oldest_modification
   here, we hope that it will be in the same cache line with io_fix,
   whose changes must be protected by buf_pool.mutex. */
+  ut_ad(temp || bpage->oldest_modification() > 2);
   bpage->clear_oldest_modification(temp);
   ut_ad(bpage->io_fix() == BUF_IO_WRITE);
   bpage->set_io_fix(BUF_IO_NONE);
@@ -2234,7 +2236,9 @@ unemployed:
 
       mysql_mutex_unlock(&buf_pool.flush_list_mutex);
 
-      if (!recv_recovery_is_on() && srv_operation == SRV_OPERATION_NORMAL)
+      if (!recv_recovery_is_on() &&
+          !srv_startup_is_before_trx_rollback_phase &&
+          srv_operation == SRV_OPERATION_NORMAL)
         log_checkpoint();
 
       mysql_mutex_lock(&buf_pool.flush_list_mutex);
diff --git a/storage/innobase/fsp/fsp0fsp.cc b/storage/innobase/fsp/fsp0fsp.cc
index 8477e74c5f1..2581cecddc3 100644
--- a/storage/innobase/fsp/fsp0fsp.cc
+++ b/storage/innobase/fsp/fsp0fsp.cc
@@ -564,7 +564,7 @@ void fsp_header_init(fil_space_t* space, uint32_t size, mtr_t* mtr)
 	in order to avoid optimizing away any unchanged most
 	significant bytes of FSP_SIZE. */
 	mtr->write<4,mtr_t::FORCED>(*block, FSP_HEADER_OFFSET + FSP_SIZE
-				   + block->frame, size);
+				    + block->frame, size);
 	ut_ad(0 == mach_read_from_4(FSP_HEADER_OFFSET + FSP_FREE_LIMIT
 				    + block->frame));
 	if (auto f = space->flags & ~FSP_FLAGS_MEM_MASK) {
@@ -758,10 +758,12 @@ fsp_try_extend_data_file(fil_space_t *space, buf_block_t *header, mtr_t *mtr)
 		return(0);
 	}
 
-	/* We ignore any fragments of a full megabyte when storing the size
-	to the space header */
+	/* For the system tablespace, we ignore any fragments of a
+	full megabyte when storing the size to the space header */
 
-	space->size_in_header = ut_2pow_round(space->size, (1024 * 1024) / ps);
+	space->size_in_header = space->id
+		? space->size
+		: ut_2pow_round(space->size, (1024 * 1024) / ps);
 
 	/* recv_sys_t::parse() expects to find a WRITE record that
 	covers all 4 bytes. Therefore, we must specify mtr_t::FORCED
@@ -1045,11 +1047,36 @@ static
 buf_block_t*
 fsp_page_create(fil_space_t *space, page_no_t offset, mtr_t *mtr)
 {
-  buf_block_t *free_block= buf_LRU_get_free_block(false);
-  buf_block_t *block= buf_page_create(space, static_cast<uint32_t>(offset),
-                                      space->zip_size(), mtr, free_block);
+  buf_block_t *block, *free_block;
+
+  if (UNIV_UNLIKELY(space->is_being_truncated))
+  {
+    const page_id_t page_id{space->id, offset};
+    const ulint fold= page_id.fold();
+    mysql_mutex_lock(&buf_pool.mutex);
+    block= reinterpret_cast<buf_block_t*>
+      (buf_pool.page_hash_get_low(page_id, fold));
+    if (block && block->page.oldest_modification() <= 1)
+      block= nullptr;
+    mysql_mutex_unlock(&buf_pool.mutex);
+
+    if (block)
+    {
+      ut_ad(block->page.buf_fix_count() >= 1);
+      ut_ad(block->lock.x_lock_count() == 1);
+      ut_ad(mtr->have_x_latch(*block));
+      free_block= block;
+      goto got_free_block;
+    }
+  }
+
+  free_block= buf_LRU_get_free_block(false);
+got_free_block:
+  block= buf_page_create(space, static_cast<uint32_t>(offset),
+                         space->zip_size(), mtr, free_block);
   if (UNIV_UNLIKELY(block != free_block))
     buf_pool.free_block(free_block);
+
   fsp_init_file_page(space, block, mtr);
   return block;
 }
@@ -1753,7 +1780,10 @@ fseg_create(fil_space_t *space, ulint byte_offset, mtr_t *mtr,
 			goto funct_exit;
 		}
 
-		ut_ad(block->lock.not_recursive());
+		ut_d(const auto x = block->lock.x_lock_count());
+		ut_ad(x || block->lock.not_recursive());
+		ut_ad(x == 1 || space->is_being_truncated);
+		ut_ad(x <= 2);
 		ut_ad(!fil_page_get_type(block->frame));
 		mtr->write<1>(*block, FIL_PAGE_TYPE + 1 + block->frame,
 			      FIL_PAGE_TYPE_SYS);
@@ -2179,14 +2209,14 @@ take_hinted_page:
 		return(NULL);
 	}
 
-	if (space->size <= ret_page && !is_system_tablespace(space_id)) {
+	if (space->size <= ret_page && !is_predefined_tablespace(space_id)) {
 		/* It must be that we are extending a single-table
 		tablespace whose size is still < 64 pages */
 
 		if (ret_page >= FSP_EXTENT_SIZE) {
-			ib::error() << "Error (2): trying to extend"
-			" a single-table tablespace " << space_id
-			<< " by single page(s) though the"
+			ib::error() << "Trying to extend '"
+			<< space->chain.start->name
+			<< "' by single page(s) though the"
 			<< " space size " << space->size
 			<< ". Page no " << ret_page << ".";
 			ut_ad(!has_done_reservation);
diff --git a/storage/innobase/include/buf0buf.h b/storage/innobase/include/buf0buf.h
index 3f922708ef1..59f4c400653 100644
--- a/storage/innobase/include/buf0buf.h
+++ b/storage/innobase/include/buf0buf.h
@@ -2142,9 +2142,7 @@ inline void buf_page_t::clear_oldest_modification()
 it from buf_pool.flush_list */
 inline void buf_page_t::clear_oldest_modification(bool temporary)
 {
-  mysql_mutex_assert_not_owner(&buf_pool.flush_list_mutex);
   ut_ad(temporary == fsp_is_system_temporary(id().space()));
-  ut_ad(io_fix_ == BUF_IO_WRITE);
   if (temporary)
   {
     ut_ad(oldest_modification() == 2);
diff --git a/storage/innobase/include/log0log.h b/storage/innobase/include/log0log.h
index a651a56e8a0..be28528adb0 100644
--- a/storage/innobase/include/log0log.h
+++ b/storage/innobase/include/log0log.h
@@ -113,12 +113,16 @@ struct completion_callback;
 void log_write_up_to(lsn_t lsn, bool flush_to_disk, bool rotate_key = false,
   const completion_callback* cb=nullptr);
 
-/** write to the log file up to the last log entry.
-@param[in]	sync	whether we want the written log
-also to be flushed to disk. */
-void
-log_buffer_flush_to_disk(
-	bool sync = true);
+/** Write to the log file up to the last log entry.
+@param sync  whether to wait for a durable write to complete */
+void log_buffer_flush_to_disk(bool sync= true);
+
+
+/** Prepare to invoke log_write_and_flush(), before acquiring log_sys.mutex. */
+ATTRIBUTE_COLD void log_write_and_flush_prepare();
+
+/** Durably write the log up to log_sys.lsn() and release log_sys.mutex. */
+ATTRIBUTE_COLD void log_write_and_flush();
 
 /** Make a checkpoint */
 ATTRIBUTE_COLD void log_make_checkpoint();
diff --git a/storage/innobase/include/mtr0mtr.h b/storage/innobase/include/mtr0mtr.h
index 00df3525fe7..5551cb7b587 100644
--- a/storage/innobase/include/mtr0mtr.h
+++ b/storage/innobase/include/mtr0mtr.h
@@ -101,6 +101,10 @@ struct mtr_t {
   /** Commit the mini-transaction. */
   void commit();
 
+  /** Commit a mini-transaction that is shrinking a tablespace.
+  @param space   tablespace that is being shrunk */
+  ATTRIBUTE_COLD void commit_shrink(fil_space_t &space);
+
   /** Commit a mini-transaction that did not modify any pages,
   but generated some redo log on a higher level, such as
   FILE_MODIFY records and an optional FILE_CHECKPOINT marker.
diff --git a/storage/innobase/include/mtr0mtr.ic b/storage/innobase/include/mtr0mtr.ic
index 3896f2f6715..f1b2f9aba83 100644
--- a/storage/innobase/include/mtr0mtr.ic
+++ b/storage/innobase/include/mtr0mtr.ic
@@ -48,8 +48,8 @@ mtr_t::memo_push(void* object, mtr_memo_type_t type)
 
 	/* If this mtr has x-fixed a clean page then we set
 	the made_dirty flag. This tells us if we need to
-	grab log_flush_order_mutex at mtr_commit so that we
-	can insert the dirtied page to the flush list. */
+	grab log_sys.flush_order_mutex at mtr_t::commit() so that we
+	can insert the dirtied page into the flush list. */
 
 	if ((type == MTR_MEMO_PAGE_X_FIX || type == MTR_MEMO_PAGE_SX_FIX)
 	    && !m_made_dirty) {
diff --git a/storage/innobase/include/sux_lock.h b/storage/innobase/include/sux_lock.h
index c09915cf6de..6d2ddadb9c3 100644
--- a/storage/innobase/include/sux_lock.h
+++ b/storage/innobase/include/sux_lock.h
@@ -98,6 +98,9 @@ public:
     ut_ad(recursive);
     return recursive == RECURSIVE_X || recursive == RECURSIVE_U;
   }
+
+  /** @return the number of X locks being held (by any thread) */
+  unsigned x_lock_count() const { return recursive & RECURSIVE_MAX; }
 #endif
 
   /** Acquire a recursive lock */
diff --git a/storage/innobase/include/trx0rseg.h b/storage/innobase/include/trx0rseg.h
index 7d0147b3752..d0dd3e016d7 100644
--- a/storage/innobase/include/trx0rseg.h
+++ b/storage/innobase/include/trx0rseg.h
@@ -55,6 +55,7 @@ trx_rsegf_get_new(
 /** Create a rollback segment header.
 @param[in,out]	space		system, undo, or temporary tablespace
 @param[in]	rseg_id		rollback segment identifier
+@param[in]	max_trx_id	new value of TRX_RSEG_MAX_TRX_ID
 @param[in,out]	sys_header	the TRX_SYS page (NULL for temporary rseg)
 @param[in,out]	mtr		mini-transaction
 @return the created rollback segment
@@ -63,6 +64,7 @@ buf_block_t*
 trx_rseg_header_create(
 	fil_space_t*	space,
 	ulint		rseg_id,
+	trx_id_t	max_trx_id,
 	buf_block_t*	sys_header,
 	mtr_t*		mtr);
 
diff --git a/storage/innobase/log/log0log.cc b/storage/innobase/log/log0log.cc
index 2757571b52c..4d927227944 100644
--- a/storage/innobase/log/log0log.cc
+++ b/storage/innobase/log/log0log.cc
@@ -833,15 +833,41 @@ void log_write_up_to(lsn_t lsn, bool flush_to_disk, bool rotate_key,
   DBUG_EXECUTE_IF("crash_after_log_write_upto", DBUG_SUICIDE(););
 }
 
-/** write to the log file up to the last log entry.
-@param[in]	sync	whether we want the written log
-also to be flushed to disk. */
+/** Write to the log file up to the last log entry.
+@param sync  whether to wait for a durable write to complete */
 void log_buffer_flush_to_disk(bool sync)
 {
   ut_ad(!srv_read_only_mode);
   log_write_up_to(log_sys.get_lsn(std::memory_order_acquire), sync);
 }
 
+/** Prepare to invoke log_write_and_flush(), before acquiring log_sys.mutex. */
+ATTRIBUTE_COLD void log_write_and_flush_prepare()
+{
+  mysql_mutex_assert_not_owner(&log_sys.mutex);
+
+  while (flush_lock.acquire(log_sys.get_lsn() + 1, nullptr) !=
+         group_commit_lock::ACQUIRED);
+  while (write_lock.acquire(log_sys.get_lsn() + 1, nullptr) !=
+         group_commit_lock::ACQUIRED);
+}
+
+/** Durably write the log and release log_sys.mutex */
+ATTRIBUTE_COLD void log_write_and_flush()
+{
+  ut_ad(!srv_read_only_mode);
+  auto lsn= log_sys.get_lsn();
+  write_lock.set_pending(lsn);
+  log_write(false);
+  ut_a(log_sys.write_lsn == lsn);
+  write_lock.release(lsn);
+
+  lsn= write_lock.value();
+  flush_lock.set_pending(lsn);
+  log_write_flush_to_disk_low(lsn);
+  flush_lock.release(lsn);
+}
+
 /********************************************************************
 
 Tries to establish a big enough margin of free space in the log buffer, such
diff --git a/storage/innobase/mtr/mtr0mtr.cc b/storage/innobase/mtr/mtr0mtr.cc
index 76a703b7496..ae3183703c2 100644
--- a/storage/innobase/mtr/mtr0mtr.cc
+++ b/storage/innobase/mtr/mtr0mtr.cc
@@ -461,6 +461,114 @@ void mtr_t::commit()
   release_resources();
 }
 
+/** Shrink a tablespace. */
+struct Shrink
+{
+  /** the first non-existing page in the tablespace */
+  const page_id_t high;
+
+  Shrink(const fil_space_t &space) : high({space.id, space.size}) {}
+
+  bool operator()(mtr_memo_slot_t *slot) const
+  {
+    if (!slot->object)
+      return true;
+    switch (slot->type) {
+    default:
+      ut_ad("invalid type" == 0);
+      return false;
+    case MTR_MEMO_SPACE_X_LOCK:
+      ut_ad(high.space() == static_cast<fil_space_t*>(slot->object)->id);
+      return true;
+    case MTR_MEMO_PAGE_X_MODIFY:
+    case MTR_MEMO_PAGE_SX_MODIFY:
+    case MTR_MEMO_PAGE_X_FIX:
+    case MTR_MEMO_PAGE_SX_FIX:
+      auto &bpage= static_cast<buf_block_t*>(slot->object)->page;
+      ut_ad(bpage.io_fix() == BUF_IO_NONE);
+      const auto id= bpage.id();
+      if (id < high)
+      {
+        ut_ad(id.space() == high.space() ||
+              (id == page_id_t{0, TRX_SYS_PAGE_NO} &&
+               srv_is_undo_tablespace(high.space())));
+        break;
+      }
+      ut_ad(id.space() == high.space());
+      ut_ad(bpage.state() == BUF_BLOCK_FILE_PAGE);
+      if (bpage.oldest_modification() > 1)
+        bpage.clear_oldest_modification(false);
+      slot->type= static_cast<mtr_memo_type_t>(slot->type & ~MTR_MEMO_MODIFY);
+    }
+    return true;
+  }
+};
+
+/** Commit a mini-transaction that is shrinking a tablespace.
+@param space   tablespace that is being shrunk */
+void mtr_t::commit_shrink(fil_space_t &space)
+{
+  ut_ad(is_active());
+  ut_ad(!is_inside_ibuf());
+  ut_ad(!high_level_read_only);
+  ut_ad(m_modifications);
+  ut_ad(m_made_dirty);
+  ut_ad(!recv_recovery_is_on());
+  ut_ad(m_log_mode == MTR_LOG_ALL);
+  ut_ad(UT_LIST_GET_LEN(space.chain) == 1);
+
+  log_write_and_flush_prepare();
+
+  const lsn_t start_lsn= finish_write(prepare_write()).first;
+
+  mysql_mutex_lock(&log_sys.flush_order_mutex);
+  /* Durably write the reduced FSP_SIZE before truncating the data file. */
+  log_write_and_flush();
+
+  os_file_truncate(space.chain.start->name, space.chain.start->handle,
+                   os_offset_t{space.size} << srv_page_size_shift, true);
+
+  if (m_freed_pages)
+  {
+    ut_ad(!m_freed_pages->empty());
+    ut_ad(m_freed_space == &space);
+    ut_ad(memo_contains(*m_freed_space));
+    ut_ad(is_named_space(m_freed_space));
+    m_freed_space->update_last_freed_lsn(m_commit_lsn);
+
+    if (!is_trim_pages())
+      for (const auto &range : *m_freed_pages)
+        m_freed_space->add_free_range(range);
+    else
+      m_freed_space->clear_freed_ranges();
+    delete m_freed_pages;
+    m_freed_pages= nullptr;
+    m_freed_space= nullptr;
+    /* mtr_t::start() will reset m_trim_pages */
+  }
+  else
+    ut_ad(!m_freed_space);
+
+  m_memo.for_each_block_in_reverse(CIterate<Shrink>{space});
+
+  m_memo.for_each_block_in_reverse(CIterate<const ReleaseBlocks>
+                                   (ReleaseBlocks(start_lsn, m_commit_lsn,
+                                                  m_memo)));
+  mysql_mutex_unlock(&log_sys.flush_order_mutex);
+
+  mysql_mutex_lock(&fil_system.mutex);
+  ut_ad(space.is_being_truncated);
+  ut_ad(space.is_stopping());
+  space.clear_stopping();
+  space.is_being_truncated= false;
+  mysql_mutex_unlock(&fil_system.mutex);
+
+  m_memo.for_each_block_in_reverse(CIterate<ReleaseLatches>());
+  srv_stats.log_write_requests.inc();
+
+  release_resources();
+}
+
 /** Commit a mini-transaction that did not modify any pages,
 but generated some redo log on a higher level, such as
 FILE_MODIFY records and an optional FILE_CHECKPOINT marker.
diff --git a/storage/innobase/row/row0ftsort.cc b/storage/innobase/row/row0ftsort.cc
index 792a9b46e8a..e116c9efc98 100644
--- a/storage/innobase/row/row0ftsort.cc
+++ b/storage/innobase/row/row0ftsort.cc
@@ -1637,7 +1637,6 @@ row_fts_merge_insert(
 	aux_table = dict_table_open_on_name(aux_table_name, false,
 					    DICT_ERR_IGNORE_NONE);
 	ut_ad(aux_table != NULL);
-	aux_table->release();
 	aux_index = dict_table_get_first_index(aux_table);
 
 	ut_ad(!aux_index->is_instant());
@@ -1762,6 +1761,8 @@ row_fts_merge_insert(
 	}
 
 exit:
+	aux_table->release();
+
 	fts_sql_commit(trx);
 
 	trx->op_info = "";
diff --git a/storage/innobase/srv/srv0srv.cc b/storage/innobase/srv/srv0srv.cc
index bb7dc5709db..f8a4d838a98 100644
--- a/storage/innobase/srv/srv0srv.cc
+++ b/storage/innobase/srv/srv0srv.cc
@@ -1808,7 +1808,9 @@ fewer_threads:
     if (history_size &&
         trx_purge(n_use_threads,
                   !(++count % srv_purge_rseg_truncate_frequency) ||
-                  purge_sys.truncate.current))
+                  purge_sys.truncate.current ||
+                  (srv_shutdown_state != SRV_SHUTDOWN_NONE &&
+                   srv_fast_shutdown == 0)))
       continue;
 
     if (m_running == sigcount)
diff --git a/storage/innobase/trx/trx0purge.cc b/storage/innobase/trx/trx0purge.cc
index d78500b1e14..54919c260c8 100644
--- a/storage/innobase/trx/trx0purge.cc
+++ b/storage/innobase/trx/trx0purge.cc
@@ -546,250 +546,255 @@ function is called, the caller must not have any latches on undo log pages!
 */
 static void trx_purge_truncate_history()
 {
-	ut_ad(purge_sys.head <= purge_sys.tail);
-	purge_sys_t::iterator& head = purge_sys.head.trx_no
-		? purge_sys.head : purge_sys.tail;
-
-	if (head.trx_no >= purge_sys.low_limit_no()) {
-		/* This is sometimes necessary. TODO: find out why. */
-		head.trx_no = purge_sys.low_limit_no();
-		head.undo_no = 0;
-	}
-
-	for (auto& rseg : trx_sys.rseg_array) {
-		if (rseg.space) {
-			trx_purge_truncate_rseg_history(rseg, head);
-		}
-	}
-
-	if (srv_undo_tablespaces_active < 2) {
-		return;
-	}
-
-	while (srv_undo_log_truncate) {
-		if (!purge_sys.truncate.current) {
-			const ulint threshold = ulint(srv_max_undo_log_size
-						      >> srv_page_size_shift);
-			for (ulint i = purge_sys.truncate.last
-				     ? purge_sys.truncate.last->id
-				     - srv_undo_space_id_start
-				     : 0, j = i;; ) {
-				ulint space_id = srv_undo_space_id_start + i;
-				ut_ad(srv_is_undo_tablespace(space_id));
-				fil_space_t* space= fil_space_get(space_id);
-
-				if (space && space->get_size() > threshold) {
-					purge_sys.truncate.current = space;
-					break;
-				}
-
-				++i;
-				i %= srv_undo_tablespaces_active;
-				if (i == j) {
-					break;
-				}
-			}
-		}
-
-		if (!purge_sys.truncate.current) {
-			return;
-		}
-
-		fil_space_t& space = *purge_sys.truncate.current;
-		/* Undo tablespace always are a single file. */
-		ut_a(UT_LIST_GET_LEN(space.chain) == 1);
-		fil_node_t* file = UT_LIST_GET_FIRST(space.chain);
-		/* The undo tablespace files are never closed. */
-		ut_ad(file->is_open());
-
-		DBUG_LOG("undo", "marking for truncate: " << file->name);
-
-		for (auto& rseg : trx_sys.rseg_array) {
-			if (rseg.space == &space) {
-				/* Once set, this rseg will
-				not be allocated to subsequent
-				transactions, but we will wait
-				for existing active
-				transactions to finish. */
-				rseg.set_skip_allocation();
-			}
-		}
+  ut_ad(purge_sys.head <= purge_sys.tail);
+  purge_sys_t::iterator &head= purge_sys.head.trx_no
+    ? purge_sys.head : purge_sys.tail;
+
+  if (head.trx_no >= purge_sys.low_limit_no())
+  {
+    /* This is sometimes necessary. TODO: find out why. */
+    head.trx_no= purge_sys.low_limit_no();
+    head.undo_no= 0;
+  }
+
+  for (auto &rseg : trx_sys.rseg_array)
+    if (rseg.space)
+      trx_purge_truncate_rseg_history(rseg, head);
+
+  if (srv_undo_tablespaces_active < 2)
+    return;
 
-		for (auto& rseg : trx_sys.rseg_array) {
-			if (rseg.space != &space) {
-				continue;
-			}
-			ut_ad(rseg.skip_allocation());
-			if (rseg.is_referenced()) {
-				return;
-			}
-			rseg.latch.rd_lock();
-			ut_ad(rseg.skip_allocation());
-			if (rseg.is_referenced()) {
+  while (srv_undo_log_truncate)
+  {
+    if (!purge_sys.truncate.current)
+    {
+      const ulint threshold=
+        ulint(srv_max_undo_log_size >> srv_page_size_shift);
+      for (ulint i= purge_sys.truncate.last
+           ? purge_sys.truncate.last->id - srv_undo_space_id_start : 0,
+           j= i;; )
+      {
+        const auto space_id= srv_undo_space_id_start + i;
+        ut_ad(srv_is_undo_tablespace(space_id));
+        fil_space_t *space= fil_space_get(space_id);
+        ut_a(UT_LIST_GET_LEN(space->chain) == 1);
+
+        if (space && space->get_size() > threshold)
+        {
+          purge_sys.truncate.current= space;
+          break;
+        }
+
+        ++i;
+        i %= srv_undo_tablespaces_active;
+        if (i == j)
+          return;
+      }
+    }
+
+    fil_space_t &space= *purge_sys.truncate.current;
+    /* Undo tablespace always are a single file. */
+    fil_node_t *file= UT_LIST_GET_FIRST(space.chain);
+    /* The undo tablespace files are never closed. */
+    ut_ad(file->is_open());
+
+    DBUG_LOG("undo", "marking for truncate: " << file->name);
+
+    for (auto &rseg : trx_sys.rseg_array)
+      if (rseg.space == &space)
+        /* Once set, this rseg will not be allocated to subsequent
+        transactions, but we will wait for existing active
+        transactions to finish. */
+        rseg.set_skip_allocation();
+
+    for (auto &rseg : trx_sys.rseg_array)
+    {
+      if (rseg.space != &space)
+        continue;
+      rseg.latch.rd_lock();
+      ut_ad(rseg.skip_allocation());
+      if (rseg.is_referenced())
+      {
 not_free:
-				rseg.latch.rd_unlock();
-				return;
-			}
-
-			if (rseg.curr_size != 1) {
-				/* Check if all segments are
-				cached and safe to remove. */
-				ulint cached = 0;
-
-				for (trx_undo_t* undo = UT_LIST_GET_FIRST(
-					     rseg.undo_cached);
-				     undo;
-				     undo = UT_LIST_GET_NEXT(undo_list,
-							     undo)) {
-					if (head.trx_no < undo->trx_id) {
-						goto not_free;
-					} else {
-						cached += undo->size;
-					}
-				}
-
-				ut_ad(rseg.curr_size > cached);
-
-				if (rseg.curr_size > cached + 1) {
-					goto not_free;
-				}
-			}
-
-			rseg.latch.rd_unlock();
-		}
-
-		ib::info() << "Truncating " << file->name;
-		trx_purge_cleanse_purge_queue(space);
-
-		/* Flush all to-be-discarded pages of the tablespace.
-
-		During truncation, we do not want any writes to the
-		to-be-discarded area, because we must set the space.size
-		early in order to have deterministic page allocation.
-
-		If a log checkpoint was completed at LSN earlier than our
-		mini-transaction commit and the server was killed, then
-		discarding the to-be-trimmed pages without flushing would
-		break crash recovery. So, we cannot avoid the write. */
-		while (buf_flush_list_space(&space));
-
-		log_free_check();
-
-		/* Re-initialize tablespace, in a single mini-transaction. */
-		mtr_t mtr;
-		const ulint size = SRV_UNDO_TABLESPACE_SIZE_IN_PAGES;
-		mtr.start();
-		mtr.x_lock_space(&space);
-
-		/* Adjust the tablespace metadata. */
-		mysql_mutex_lock(&fil_system.mutex);
-		ut_d(bool stopped=) space.set_stopping();
-		ut_ad(!stopped);
-		space.is_being_truncated = true;
-		if (space.crypt_data) {
-			space.reacquire();
-			mysql_mutex_unlock(&fil_system.mutex);
-			fil_space_crypt_close_tablespace(&space);
-			space.release();
-		} else {
-			mysql_mutex_unlock(&fil_system.mutex);
-		}
-
-		uint i = 60;
-
-		while (space.referenced()) {
-			if (!--i) {
-				mtr.commit();
-				ib::error() << "Failed to freeze"
-					" UNDO tablespace "
-					    << file->name;
-				return;
-			}
-
-			std::this_thread::sleep_for(std::chrono::seconds(1));
-		}
-
-		/* Associate the undo tablespace with mtr.
-		During mtr::commit(), InnoDB can use the undo
-		tablespace object to clear all freed ranges */
-		mtr.set_named_space(&space);
-		mtr.trim_pages(page_id_t(space.id, size));
-		fsp_header_init(&space, size, &mtr);
-		mysql_mutex_lock(&fil_system.mutex);
-		space.size = file->size = size;
-		mysql_mutex_unlock(&fil_system.mutex);
-
-		buf_block_t* sys_header = trx_sysf_get(&mtr);
-
-		for (auto& rseg : trx_sys.rseg_array) {
-			if (rseg.space != &space) {
-				continue;
-			}
-
-			buf_block_t* rblock = trx_rseg_header_create(
-				purge_sys.truncate.current,
-				i, sys_header, &mtr);
-			ut_ad(rblock);
-			/* These were written by trx_rseg_header_create(). */
-			ut_ad(!mach_read_from_4(TRX_RSEG + TRX_RSEG_FORMAT
-						+ rblock->frame));
-			ut_ad(!mach_read_from_4(TRX_RSEG + TRX_RSEG_HISTORY_SIZE
-						+ rblock->frame));
-			rseg.reinit(rblock
-				    ? rblock->page.id().page_no() : FIL_NULL);
-		}
-
-		mtr.commit();
-		/* Write-ahead the redo log record. */
-		log_write_up_to(mtr.commit_lsn(), true);
-
-		/* Trim the file size. */
-		os_file_truncate(file->name, file->handle,
-				 os_offset_t(size) << srv_page_size_shift,
-				 true);
-
-		/* This is only executed by srv_purge_coordinator_thread. */
-		export_vars.innodb_undo_truncations++;
-
-		/* In MDEV-8319 (10.5) we will PUNCH_HOLE the garbage
-		(with write-ahead logging). */
-		mysql_mutex_lock(&fil_system.mutex);
-		ut_ad(&space == purge_sys.truncate.current);
-		ut_ad(space.is_being_truncated);
-		purge_sys.truncate.current->clear_stopping();
-		purge_sys.truncate.current->is_being_truncated = false;
-		mysql_mutex_unlock(&fil_system.mutex);
-
-		if (purge_sys.rseg != NULL
-		    && purge_sys.rseg->last_page_no == FIL_NULL) {
-			/* If purge_sys.rseg is pointing to rseg that
-			was recently truncated then move to next rseg
-			element.  Note: Ideally purge_sys.rseg should
-			be NULL because purge should complete
-			processing of all the records but there is
-			purge_batch_size that can force the purge loop
-			to exit before all the records are purged and
-			in this case purge_sys.rseg could point to a
-			valid rseg waiting for next purge cycle. */
-			purge_sys.next_stored = false;
-			purge_sys.rseg = NULL;
-		}
-
-		DBUG_EXECUTE_IF("ib_undo_trunc",
-				ib::info() << "ib_undo_trunc";
-				log_buffer_flush_to_disk();
-				DBUG_SUICIDE(););
-
-		for (auto& rseg : trx_sys.rseg_array) {
-			if (rseg.space == &space) {
-				rseg.clear_skip_allocation();
-			}
-		}
-
-		ib::info() << "Truncated " << file->name;
-		purge_sys.truncate.last = purge_sys.truncate.current;
-		purge_sys.truncate.current = NULL;
-	}
+        rseg.latch.rd_unlock();
+        return;
+      }
+
+      if (rseg.curr_size != 1)
+      {
+        /* Check if all segments are cached and safe to remove. */
+        ulint cached= 0;
+        for (trx_undo_t *undo= UT_LIST_GET_FIRST(rseg.undo_cached); undo;
+             undo= UT_LIST_GET_NEXT(undo_list, undo))
+        {
+          if (head.trx_no < undo->trx_id)
+            goto not_free;
+          else
+            cached+= undo->size;
+        }
+
+        ut_ad(rseg.curr_size > cached);
+
+        if (rseg.curr_size > cached + 1)
+          goto not_free;
+      }
+
+      rseg.latch.rd_unlock();
+    }
+
+    ib::info() << "Truncating " << file->name;
+    trx_purge_cleanse_purge_queue(space);
+
+    log_free_check();
+
+    mtr_t mtr;
+    mtr.start();
+    mtr.x_lock_space(&space);
+
+    /* Lock all modified pages of the tablespace.
+
+    During truncation, we do not want any writes to the file.
+
+    If a log checkpoint was completed at LSN earlier than our
+    mini-transaction commit and the server was killed, then
+    discarding the to-be-trimmed pages without flushing would
+    break crash recovery. */
+    mysql_mutex_lock(&buf_pool.flush_list_mutex);
+
+    for (buf_page_t *bpage= UT_LIST_GET_LAST(buf_pool.flush_list); bpage; )
+    {
+      ut_ad(bpage->oldest_modification());
+      ut_ad(bpage->in_file());
+
+      buf_page_t *prev= UT_LIST_GET_PREV(list, bpage);
+
+      if (bpage->id().space() == space.id &&
+          bpage->oldest_modification() != 1)
+      {
+        ut_ad(bpage->state() == BUF_BLOCK_FILE_PAGE);
+        auto block= reinterpret_cast<buf_block_t*>(bpage);
+        block->fix();
+        buf_pool.flush_hp.set(prev);
+        mysql_mutex_unlock(&buf_pool.flush_list_mutex);
+
+#ifdef BTR_CUR_HASH_ADAPT
+        ut_ad(!block->index); /* There is no AHI on undo tablespaces. */
+#endif
+        block->lock.x_lock();
+        mysql_mutex_lock(&buf_pool.flush_list_mutex);
+        ut_ad(bpage->io_fix() == BUF_IO_NONE);
+
+        if (bpage->oldest_modification() > 1)
+        {
+          bpage->clear_oldest_modification(false);
+          mtr.memo_push(block, MTR_MEMO_PAGE_X_FIX);
+        }
+        else
+        {
+          block->lock.x_unlock();
+          block->unfix();
+        }
+
+        if (prev != buf_pool.flush_hp.get())
+        {
+          /* Rescan, because we may have lost the position. */
+          bpage= UT_LIST_GET_LAST(buf_pool.flush_list);
+          continue;
+        }
+      }
+
+      bpage= prev;
+    }
+
+    mysql_mutex_unlock(&buf_pool.flush_list_mutex);
+
+    /* Re-initialize tablespace, in a single mini-transaction. */
+    const ulint size= SRV_UNDO_TABLESPACE_SIZE_IN_PAGES;
+
+    /* Adjust the tablespace metadata. */
+    mysql_mutex_lock(&fil_system.mutex);
+    space.set_stopping();
+    space.is_being_truncated= true;
+    if (space.crypt_data)
+    {
+      space.reacquire();
+      mysql_mutex_unlock(&fil_system.mutex);
+      fil_space_crypt_close_tablespace(&space);
+      space.release();
+    }
+    else
+      mysql_mutex_unlock(&fil_system.mutex);
+
+    for (auto i= 6000; space.referenced();
+         std::this_thread::sleep_for(std::chrono::milliseconds(10)))
+    {
+      if (!--i)
+      {
+        mtr.commit();
+        ib::error() << "Failed to freeze UNDO tablespace " << file->name;
+        return;
+      }
+    }
+
+    /* Associate the undo tablespace with mtr.
+    During mtr::commit_shrink(), InnoDB can use the undo
+    tablespace object to clear all freed ranges */
+    mtr.set_named_space(&space);
+    mtr.trim_pages(page_id_t(space.id, size));
+    fsp_header_init(&space, size, &mtr);
+    mysql_mutex_lock(&fil_system.mutex);
+    space.size= file->size= size;
+    mysql_mutex_unlock(&fil_system.mutex);
+
+    buf_block_t *sys_header= trx_sysf_get(&mtr);
+
+    for (auto &rseg : trx_sys.rseg_array)
+    {
+      if (rseg.space != &space)
+        continue;
+
+      buf_block_t *rblock= trx_rseg_header_create(&space,
+                                                  &rseg - trx_sys.rseg_array,
+                                                  trx_sys.get_max_trx_id(),
+                                                  sys_header, &mtr);
+      ut_ad(rblock);
+      /* These were written by trx_rseg_header_create(). */
+      ut_ad(!mach_read_from_4(TRX_RSEG + TRX_RSEG_FORMAT + rblock->frame));
+      ut_ad(!mach_read_from_4(TRX_RSEG + TRX_RSEG_HISTORY_SIZE +
+                              rblock->frame));
+      rseg.reinit(rblock ? rblock->page.id().page_no() : FIL_NULL);
+    }
+
+    mtr.commit_shrink(space);
+
+    /* No mutex; this is only updated by the purge coordinator. */
+    export_vars.innodb_undo_truncations++;
+
+    if (purge_sys.rseg && purge_sys.rseg->last_page_no == FIL_NULL)
+    {
+      /* If purge_sys.rseg is pointing to rseg that was recently
+      truncated then move to next rseg element.
+
+      Note: Ideally purge_sys.rseg should be NULL because purge should
+      complete processing of all the records but srv_purge_batch_size
+      can force the purge loop to exit before all the records are purged. */
+      purge_sys.rseg= nullptr;
+      purge_sys.next_stored= false;
+    }
+
+    DBUG_EXECUTE_IF("ib_undo_trunc", ib::info() << "ib_undo_trunc";
+                    log_buffer_flush_to_disk();
+                    DBUG_SUICIDE(););
+
+    for (auto &rseg : trx_sys.rseg_array)
+      if (rseg.space == &space)
+        rseg.clear_skip_allocation();
+
+    ib::info() << "Truncated " << file->name;
+    purge_sys.truncate.last= purge_sys.truncate.current;
+    ut_ad(&space == purge_sys.truncate.current);
+    purge_sys.truncate.current= nullptr;
+  }
 }
 
 /***********************************************************************//**
diff --git a/storage/innobase/trx/trx0rseg.cc b/storage/innobase/trx/trx0rseg.cc
index 6c83feb0b8a..ace1d8531fc 100644
--- a/storage/innobase/trx/trx0rseg.cc
+++ b/storage/innobase/trx/trx0rseg.cc
@@ -299,6 +299,7 @@ void trx_rseg_format_upgrade(buf_block_t *rseg_header, mtr_t *mtr)
 /** Create a rollback segment header.
 @param[in,out]	space		system, undo, or temporary tablespace
 @param[in]	rseg_id		rollback segment identifier
+@param[in]	max_trx_id	new value of TRX_RSEG_MAX_TRX_ID
 @param[in,out]	sys_header	the TRX_SYS page (NULL for temporary rseg)
 @param[in,out]	mtr		mini-transaction
 @return the created rollback segment
@@ -307,6 +308,7 @@ buf_block_t*
 trx_rseg_header_create(
 	fil_space_t*	space,
 	ulint		rseg_id,
+	trx_id_t	max_trx_id,
 	buf_block_t*	sys_header,
 	mtr_t*		mtr)
 {
@@ -327,10 +329,16 @@ trx_rseg_header_create(
 				    + block->frame));
 	ut_ad(0 == mach_read_from_4(TRX_RSEG_HISTORY_SIZE + TRX_RSEG
 				    + block->frame));
+	ut_ad(0 == mach_read_from_4(TRX_RSEG_MAX_TRX_ID + TRX_RSEG
+				    + block->frame));
 
 	/* Initialize the history list */
 	flst_init(block, TRX_RSEG_HISTORY + TRX_RSEG, mtr);
 
+	mtr->write<8,mtr_t::MAYBE_NOP>(*block,
+				       TRX_RSEG + TRX_RSEG_MAX_TRX_ID
+				       + block->frame, max_trx_id);
+
 	/* Reset the undo log slots */
 	mtr->memset(block, TRX_RSEG_UNDO_SLOTS + TRX_RSEG,
 		    TRX_RSEG_N_SLOTS * 4, 0xff);
@@ -678,7 +686,7 @@ void trx_temp_rseg_create()
 		mtr.x_lock_space(fil_system.temp_space);
 
 		buf_block_t* rblock = trx_rseg_header_create(
-			fil_system.temp_space, i, NULL, &mtr);
+			fil_system.temp_space, i, 0, NULL, &mtr);
 		trx_sys.temp_rsegs[i].init(fil_system.temp_space,
 					   rblock->page.id().page_no());
 		mtr.commit();
diff --git a/storage/innobase/trx/trx0sys.cc b/storage/innobase/trx/trx0sys.cc
index fd5617fec76..52e246c5c4f 100644
--- a/storage/innobase/trx/trx0sys.cc
+++ b/storage/innobase/trx/trx0sys.cc
@@ -191,7 +191,7 @@ trx_sysf_create(
 	/* Create the first rollback segment in the SYSTEM tablespace */
 	slot_no = trx_sys_rseg_find_free(block);
 	buf_block_t* rblock = trx_rseg_header_create(fil_system.sys_space,
-						     slot_no, block, mtr);
+						     slot_no, 0, block, mtr);
 
 	ut_a(slot_no == TRX_SYS_SYSTEM_RSEG_ID);
 	ut_a(rblock->page.id() == page_id_t(0, FSP_FIRST_RSEG_PAGE_NO));
@@ -293,7 +293,7 @@ static trx_rseg_t *trx_rseg_create(ulint space_id)
     {
       ulint rseg_id= trx_sys_rseg_find_free(sys_header);
       if (buf_block_t *rblock= rseg_id == ULINT_UNDEFINED
-          ? nullptr : trx_rseg_header_create(space, rseg_id, sys_header,
+          ? nullptr : trx_rseg_header_create(space, rseg_id, 0, sys_header,
                                              &mtr))
       {
         ut_ad(trx_sysf_rseg_get_space(sys_header, rseg_id) == space_id);
diff --git a/storage/spider/mysql-test/spider/r/udf_pushdown.result b/storage/spider/mysql-test/spider/r/udf_pushdown.result
new file mode 100644
index 00000000000..4ca734165e7
--- /dev/null
+++ b/storage/spider/mysql-test/spider/r/udf_pushdown.result
@@ -0,0 +1,218 @@
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3
+child3_1
+child3_2
+child3_3
+#
+# MDEV-26545 Spider does not correctly handle UDF and stored function in where conds
+#
+
+##### enable general_log #####
+connection child2_1;
+SET @general_log_backup = @@global.general_log;
+SET @log_output_backup = @@global.log_output;
+SET @@global.general_log = 1;
+SET @@global.log_output = "TABLE";
+TRUNCATE TABLE mysql.general_log;
+
+##### create databases #####
+connection master_1;
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+connection child2_1;
+CREATE DATABASE auto_test_remote;
+USE auto_test_remote;
+
+##### create tables #####
+connection child2_1;
+CHILD_CREATE_TABLE
+connection master_1;
+MASTER_CREATE_TABLE
+CREATE TABLE ta_l (
+id INT NOT NULL,
+a INT,
+PRIMARY KEY(id)
+) MASTER_1_ENGINE MASTER_1_CHARSET MASTER_1_COMMENT_2_1
+INSERT INTO ta_l VALUES
+(1, 11),
+(2, 22),
+(3, 33),
+(4, 44),
+(5, 55);
+
+##### create functions #####
+connection master_1;
+CREATE FUNCTION `plusone`( param INT ) RETURNS INT
+BEGIN
+RETURN param + 1;
+END //
+connection child2_1;
+CREATE FUNCTION `plusone`( param INT ) RETURNS INT
+BEGIN
+RETURN param + 1;
+END //
+
+########## spider_use_pushdown_udf=0 ##########
+connection master_1;
+SET @@spider_use_pushdown_udf = 0;
+
+##### test SELECTs #####
+connection master_1;
+SELECT * FROM ta_l WHERE id = plusone(1);
+id	a
+2	22
+SELECT * FROM ta_l WHERE id IN (plusone(1), plusone(2)) AND a = plusone(32);
+id	a
+3	33
+connection child2_1;
+SELECT argument FROM mysql.general_log WHERE argument LIKE "%select%" AND argument NOT LIKE "%argument%";
+argument
+select `id`,`a` from `auto_test_remote`.`ta_r`
+select `id`,`a` from `auto_test_remote`.`ta_r`
+
+##### test UPDATEs #####
+connection master_1;
+UPDATE ta_l SET a = plusone(221) WHERE id = plusone(1);
+SELECT * FROM ta_l;
+id	a
+1	11
+2	222
+3	33
+4	44
+5	55
+UPDATE ta_l SET a = plusone(332) WHERE id IN (plusone(1), plusone(2)) AND a = plusone(32);
+SELECT * FROM ta_l;
+id	a
+1	11
+2	222
+3	333
+4	44
+5	55
+connection child2_1;
+SELECT argument FROM mysql.general_log WHERE argument LIKE "%update%" AND argument NOT LIKE "%argument%";
+argument
+select `id`,`a` from `auto_test_remote`.`ta_r` for update
+update `auto_test_remote`.`ta_r` set `a` = 222 where `id` = 2 limit 1
+select `id`,`a` from `auto_test_remote`.`ta_r` for update
+update `auto_test_remote`.`ta_r` set `a` = 333 where `id` = 3 and `a` = 33 limit 1
+
+##### test DELETEs #####
+connection master_1;
+DELETE FROM ta_l WHERE id = plusone(1);
+SELECT * FROM ta_l;
+id	a
+1	11
+3	333
+4	44
+5	55
+DELETE FROM ta_l WHERE id IN (plusone(1), plusone(2), plusone(3)) AND a = plusone(43);
+SELECT * FROM ta_l;
+id	a
+1	11
+3	333
+5	55
+connection child2_1;
+SELECT argument FROM mysql.general_log WHERE (argument LIKE "%delete%" OR argument LIKE "%update%") AND argument NOT LIKE "%argument%";
+argument
+select `id` from `auto_test_remote`.`ta_r` for update
+delete from `auto_test_remote`.`ta_r` where `id` = 2 limit 1
+select `id`,`a` from `auto_test_remote`.`ta_r` for update
+delete from `auto_test_remote`.`ta_r` where `id` = 4 and `a` = 44 limit 1
+
+##### reset records #####
+connection master_1;
+TRUNCATE TABLE ta_l;
+INSERT INTO ta_l VALUES
+(1, 11),
+(2, 22),
+(3, 33),
+(4, 44),
+(5, 55);
+
+########## spider_use_pushdown_udf=1 ##########
+connection master_1;
+SET @@spider_use_pushdown_udf = 1;
+
+##### test SELECTs #####
+connection master_1;
+SELECT * FROM ta_l WHERE id = plusone(1);
+id	a
+2	22
+SELECT * FROM ta_l WHERE id IN (plusone(1), plusone(2)) AND a = plusone(32);
+id	a
+3	33
+connection child2_1;
+SELECT argument FROM mysql.general_log WHERE argument LIKE "%select%" AND argument NOT LIKE "%argument%";
+argument
+select t0.`id` `id`,t0.`a` `a` from `auto_test_remote`.`ta_r` t0 where (t0.`id` = (`plusone`(1)))
+select t0.`id` `id`,t0.`a` `a` from `auto_test_remote`.`ta_r` t0 where ((t0.`id` in( (`plusone`(1)) , (`plusone`(2)))) and (t0.`a` = (`plusone`(32))))
+
+##### test UPDATEs #####
+connection master_1;
+UPDATE ta_l SET a = plusone(221) WHERE id = plusone(1);
+SELECT * FROM ta_l;
+id	a
+1	11
+2	222
+3	33
+4	44
+5	55
+UPDATE ta_l SET a = plusone(332) WHERE id IN (plusone(1), plusone(2)) AND a = plusone(32);
+SELECT * FROM ta_l;
+id	a
+1	11
+2	222
+3	333
+4	44
+5	55
+connection child2_1;
+SELECT argument FROM mysql.general_log WHERE argument LIKE "%update%" AND argument NOT LIKE "%argument%";
+argument
+update `auto_test_remote`.`ta_r` set `a` = (`plusone`(221)) where (`id` = (`plusone`(1)))
+update `auto_test_remote`.`ta_r` set `a` = (`plusone`(332)) where ((`id` in( (`plusone`(1)) , (`plusone`(2)))) and (`a` = (`plusone`(32))))
+
+##### test DELETEs #####
+connection master_1;
+DELETE FROM ta_l WHERE id = plusone(1);
+SELECT * FROM ta_l;
+id	a
+1	11
+3	333
+4	44
+5	55
+DELETE FROM ta_l WHERE id IN (plusone(1), plusone(2), plusone(3)) AND a = plusone(43);
+SELECT * FROM ta_l;
+id	a
+1	11
+3	333
+5	55
+connection child2_1;
+SELECT argument FROM mysql.general_log WHERE (argument LIKE "%delete%" OR argument LIKE "%update%") AND argument NOT LIKE "%argument%";
+argument
+delete from `auto_test_remote`.`ta_r` where (`id` = (`plusone`(1)))
+delete from `auto_test_remote`.`ta_r` where ((`id` in( (`plusone`(1)) , (`plusone`(2)) , (`plusone`(3)))) and (`a` = (`plusone`(43))))
+
+deinit
+connection master_1;
+DROP FUNCTION `plusone`;
+DROP DATABASE IF EXISTS auto_test_local;
+connection child2_1;
+SET @@global.general_log = @general_log_backup;
+SET @@global.log_output = @log_output_backup;
+DROP FUNCTION `plusone`;
+DROP DATABASE IF EXISTS auto_test_remote;
+for master_1
+for child2
+child2_1
+child2_2
+child2_3
+for child3
+child3_1
+child3_2
+child3_3
+
+end of test
diff --git a/storage/spider/mysql-test/spider/t/udf_pushdown.inc b/storage/spider/mysql-test/spider/t/udf_pushdown.inc
new file mode 100644
index 00000000000..160e8af21b2
--- /dev/null
+++ b/storage/spider/mysql-test/spider/t/udf_pushdown.inc
@@ -0,0 +1,48 @@
+--echo
+--echo ##### test SELECTs #####
+--connection master_1
+SELECT * FROM ta_l WHERE id = plusone(1);
+SELECT * FROM ta_l WHERE id IN (plusone(1), plusone(2)) AND a = plusone(32);
+
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  SELECT argument FROM mysql.general_log WHERE argument LIKE "%select%" AND argument NOT LIKE "%argument%";
+  --disable_query_log
+  TRUNCATE TABLE mysql.general_log;
+  --enable_query_log
+}
+
+--echo
+--echo ##### test UPDATEs #####
+--connection master_1
+UPDATE ta_l SET a = plusone(221) WHERE id = plusone(1);
+SELECT * FROM ta_l;
+UPDATE ta_l SET a = plusone(332) WHERE id IN (plusone(1), plusone(2)) AND a = plusone(32);
+SELECT * FROM ta_l;
+
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  SELECT argument FROM mysql.general_log WHERE argument LIKE "%update%" AND argument NOT LIKE "%argument%";
+  --disable_query_log
+  TRUNCATE TABLE mysql.general_log;
+  --enable_query_log
+}
+
+--echo
+--echo ##### test DELETEs #####
+--connection master_1
+DELETE FROM ta_l WHERE id = plusone(1);
+SELECT * FROM ta_l;
+DELETE FROM ta_l WHERE id IN (plusone(1), plusone(2), plusone(3)) AND a = plusone(43);
+SELECT * FROM ta_l;
+
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  SELECT argument FROM mysql.general_log WHERE (argument LIKE "%delete%" OR argument LIKE "%update%") AND argument NOT LIKE "%argument%";
+  --disable_query_log
+  TRUNCATE TABLE mysql.general_log;
+  --enable_query_log
+}
diff --git a/storage/spider/mysql-test/spider/t/udf_pushdown.test b/storage/spider/mysql-test/spider/t/udf_pushdown.test
new file mode 100644
index 00000000000..2eadbbbb40b
--- /dev/null
+++ b/storage/spider/mysql-test/spider/t/udf_pushdown.test
@@ -0,0 +1,141 @@
+--disable_warnings
+--disable_query_log
+--disable_result_log
+--source test_init.inc
+--enable_result_log
+--enable_query_log
+
+--echo #
+--echo # MDEV-26545 Spider does not correctly handle UDF and stored function in where conds
+--echo #
+
+let $CHILD_CREATE_TABLE=
+  CREATE TABLE ta_r (
+    id INT NOT NULL,
+    a INT,
+    PRIMARY KEY(id)
+  ) $CHILD2_1_ENGINE $CHILD2_1_CHARSET;
+
+let $MASTER_CREATE_TABLE_OUTPUT=
+  CREATE TABLE ta_l (
+    id INT NOT NULL,
+    a INT,
+    PRIMARY KEY(id)
+  ) MASTER_1_ENGINE MASTER_1_CHARSET MASTER_1_COMMENT_2_1;
+
+let $MASTER_CREATE_TABLE=
+  CREATE TABLE ta_l (
+    id INT NOT NULL,
+    a INT,
+    PRIMARY KEY(id)
+  ) $MASTER_1_ENGINE $MASTER_1_CHARSET $MASTER_1_COMMENT_2_1;
+
+--echo
+--echo ##### enable general_log #####
+--connection child2_1
+SET @general_log_backup = @@global.general_log;
+SET @log_output_backup = @@global.log_output;
+SET @@global.general_log = 1;
+SET @@global.log_output = "TABLE";
+TRUNCATE TABLE mysql.general_log;
+
+--echo
+--echo ##### create databases #####
+--connection master_1
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  CREATE DATABASE auto_test_remote;
+  USE auto_test_remote;
+}
+
+--echo
+--echo ##### create tables #####
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  --disable_query_log
+  echo CHILD_CREATE_TABLE;
+  eval $CHILD_CREATE_TABLE;
+  --enable_query_log
+}
+
+--connection master_1
+--disable_query_log
+echo MASTER_CREATE_TABLE;
+echo $MASTER_CREATE_TABLE_OUTPUT;
+eval $MASTER_CREATE_TABLE;
+--enable_query_log
+
+INSERT INTO ta_l VALUES
+    (1, 11),
+    (2, 22),
+    (3, 33),
+    (4, 44),
+    (5, 55);
+
+--echo
+--echo ##### create functions #####
+--connection master_1
+DELIMITER //;
+CREATE FUNCTION `plusone`( param INT ) RETURNS INT
+BEGIN
+    RETURN param + 1;
+END //
+DELIMITER ;//
+
+--connection child2_1
+DELIMITER //;
+CREATE FUNCTION `plusone`( param INT ) RETURNS INT
+BEGIN
+    RETURN param + 1;
+END //
+DELIMITER ;//
+
+--echo
+--echo ########## spider_use_pushdown_udf=0 ##########
+--connection master_1
+SET @@spider_use_pushdown_udf = 0;
+--source udf_pushdown.inc
+
+--echo
+--echo ##### reset records #####
+--connection master_1
+TRUNCATE TABLE ta_l;
+INSERT INTO ta_l VALUES
+    (1, 11),
+    (2, 22),
+    (3, 33),
+    (4, 44),
+    (5, 55);
+
+--echo
+--echo ########## spider_use_pushdown_udf=1 ##########
+--connection master_1
+SET @@spider_use_pushdown_udf = 1;
+--source udf_pushdown.inc
+
+--echo
+--echo deinit
+--disable_warnings
+--connection master_1
+DROP FUNCTION `plusone`;
+DROP DATABASE IF EXISTS auto_test_local;
+if ($USE_CHILD_GROUP2)
+{
+  --connection child2_1
+  SET @@global.general_log = @general_log_backup;
+  SET @@global.log_output = @log_output_backup;
+  DROP FUNCTION `plusone`;
+  DROP DATABASE IF EXISTS auto_test_remote;
+}
+--disable_query_log
+--disable_result_log
+--source test_deinit.inc
+--enable_result_log
+--enable_query_log
+--enable_warnings
+--echo
+--echo end of test
diff --git a/storage/spider/spd_db_mysql.cc b/storage/spider/spd_db_mysql.cc
index 10b4fb7cee4..62e6e2f1245 100644
--- a/storage/spider/spd_db_mysql.cc
+++ b/storage/spider/spd_db_mysql.cc
@@ -6676,11 +6676,17 @@ int spider_db_mbase_util::open_item_func(
         separator_str_length = SPIDER_SQL_AND_LEN;
       }
       break;
+    case Item_func::FUNC_SP:
     case Item_func::UDF_FUNC:
       use_pushdown_udf = spider_param_use_pushdown_udf(
         spider->wide_handler->trx->thd,
         spider->share->use_pushdown_udf);
       if (!use_pushdown_udf)
+        /*
+          This is the default behavior because the remote nodes may deal with
+          the function in an unexpected way (e.g. not having the same
+          definition). Users can turn it on if they know what they are doing.
+        */
         DBUG_RETURN(ER_SPIDER_COND_SKIP_NUM);
       if (str)
       {
diff --git a/storage/spider/spd_param.cc b/storage/spider/spd_param.cc
index ec0949b579f..b23877ca92a 100644
--- a/storage/spider/spd_param.cc
+++ b/storage/spider/spd_param.cc
@@ -2005,7 +2005,7 @@ static MYSQL_THDVAR_INT(
   "Remote server transmission existence when UDF is used at condition and \"engine_condition_pushdown=1\"", /* comment */
   NULL, /* check */
   NULL, /* update */
-  -1, /* def */
+  0, /* def */
   -1, /* min */
   1, /* max */
   0 /* blk */
diff --git a/wsrep-lib b/wsrep-lib
-Subproject 4f1c201c9d8ba96f9f43e9aafe8bb6a6c8aeceb
+Subproject efb4aab090cb9c1b57b9e7f9988ae1c41f48344