Merge 10.2 into 10.3

29 files changed, 1362 insertions, 35 deletions

diff --git a/appveyor.yml b/appveyor.yml
index b42453a8350..9797aec6b44 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,3 +1,9 @@
+init:
+  # Install bison
+  - choco feature disable --name showDownloadProgress
+  - choco install -y winflexbison
+  - C:\ProgramData\chocolatey\lib\winflexbison\tools\win_bison.exe --version
+
 version: build-{build}~branch-{branch}
 
 clone_depth: 1
@@ -17,7 +23,7 @@ build_script:
   - set BUILD_TYPE=MinSizeRel
   - set GENERATOR=-GNinja
   - call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat"
-  - cmake -E time cmake %GENERATOR% .. -DCMAKE_BUILD_TYPE=%BUILD_TYPE% -DMYSQL_MAINTAINER_MODE=ERR -DFAST_BUILD=1 -DBISON_EXECUTABLE=C:\cygwin64\bin\bison -DPLUGIN_PERFSCHEMA=NO -DPLUGIN_FEEDBACK=NO
+  - cmake -E time cmake %GENERATOR% .. -DCMAKE_BUILD_TYPE=%BUILD_TYPE% -DMYSQL_MAINTAINER_MODE=ERR -DFAST_BUILD=1 -DBISON_EXECUTABLE=C:\ProgramData\chocolatey\lib\winflexbison\tools\win_bison.exe -DPLUGIN_PERFSCHEMA=NO -DPLUGIN_FEEDBACK=NO
   - set /A jobs=2*%NUMBER_OF_PROCESSORS%
   - cmake -E time cmake --build . -j %jobs% --config %BUILD_TYPE% --target minbuild
 
diff --git a/client/mysql.cc b/client/mysql.cc
index 31b56441f23..e1069017c82 100644
--- a/client/mysql.cc
+++ b/client/mysql.cc
@@ -1,6 +1,6 @@
 /*
    Copyright (c) 2000, 2018, Oracle and/or its affiliates.
-   Copyright (c) 2009, 2019, MariaDB Corporation.
+   Copyright (c) 2009, 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
@@ -90,10 +90,14 @@ extern "C" {
 #if defined(__WIN__)
 #include <conio.h>
 #else
-#include <readline.h>
-#if !defined(USE_LIBEDIT_INTERFACE)
-#include <history.h>
-#endif
+# ifdef __APPLE__
+#  include <editline/readline.h>
+# else
+#  include <readline.h>
+#  if !defined(USE_LIBEDIT_INTERFACE)
+#   include <history.h>
+#  endif
+# endif
 #define HAVE_READLINE
 #define USE_POPEN
 #endif
diff --git a/cmake/cpack_rpm.cmake b/cmake/cpack_rpm.cmake
index 6abe4e8b223..8743ca2a325 100644
--- a/cmake/cpack_rpm.cmake
+++ b/cmake/cpack_rpm.cmake
@@ -48,21 +48,82 @@ SET(CPACK_RPM_PACKAGE_RELOCATABLE FALSE)
 SET(CPACK_PACKAGE_RELOCATABLE FALSE)
 SET(CPACK_RPM_PACKAGE_GROUP "Applications/Databases")
 SET(CPACK_RPM_PACKAGE_URL ${CPACK_PACKAGE_URL})
-SET(CPACK_RPM_PACKAGE_DESCRIPTION "${CPACK_PACKAGE_DESCRIPTION}")
 
 SET(CPACK_RPM_shared_PACKAGE_VENDOR "MariaDB Corporation Ab")
 SET(CPACK_RPM_shared_PACKAGE_LICENSE "LGPLv2.1")
-SET(CPACK_RPM_shared_PACKAGE_SUMMARY "LGPL MariaDB client library")
-SET(CPACK_RPM_shared_PACKAGE_DESCRIPTION "
-This is LGPL MariaDB client library that can be used to connect to MySQL
+
+# Set default description for packages
+SET(CPACK_RPM_PACKAGE_DESCRIPTION "MariaDB: a very fast and robust SQL database server
+
+It is GPL v2 licensed, which means you can use the it free of charge under the
+conditions of the GNU General Public License Version 2 (http://www.gnu.org/licenses/).
+
+MariaDB documentation can be found at https://mariadb.com/kb
+MariaDB bug reports should be submitted through https://jira.mariadb.org")
+
+# Packages with default description
+SET(CPACK_RPM_client_PACKAGE_SUMMARY "MariaDB database client binaries")
+SET(CPACK_RPM_common_PACKAGE_SUMMARY "MariaDB database common files (e.g. /etc/mysql/conf.d/mariadb.cnf)")
+SET(CPACK_RPM_compat_PACKAGE_SUMMARY "MariaDB database client library MySQL compat package")
+SET(CPACK_RPM_devel_PACKAGE_SUMMARY "MariaDB database development files")
+SET(CPACK_RPM_server_PACKAGE_SUMMARY "MariaDB database server binaries")
+SET(CPACK_RPM_test_PACKAGE_SUMMARY "MariaDB database regression test suite")
+
+# libmariadb3
+SET(CPACK_RPM_shared_PACKAGE_SUMMARY "LGPL MariaDB database client library")
+SET(CPACK_RPM_shared_PACKAGE_DESCRIPTION "This is LGPL MariaDB client library that can be used to connect to MySQL
 or MariaDB.
 
 This code is based on the LGPL libmysql client library from MySQL 3.23
 and PHP's mysqlnd extension.
 
 This product includes PHP software, freely available from
-<http://www.php.net/software/>
-")
+http://www.php.net/software/")
+
+# Summary and descriptions per package
+SET(CPACK_RPM_backup_PACKAGE_SUMMARY "Backup tool for MariaDB server")
+SET(CPACK_RPM_backup_PACKAGE_DESCRIPTION "Mariabackup is an open source tool provided by MariaDB
+for performing physical online backups of InnoDB, Aria and MyISAM tables.
+For InnoDB, “hot online” backups are possible.
+It was originally forked from Percona XtraBackup 2.3.8.")
+
+SET(CPACK_RPM_cassandra-engine_PACKAGE_SUMMARY "Cassandra storage engine for MariaDB")
+SET(CPACK_RPM_cassandra-engine_PACKAGE_DESCRIPTION "The Cassandra Storage Engine allows access to data in a Cassandra cluster from
+MariaDB, combining the best of SQL and no-SQL worlds. Cassandra SE (storage
+engine) makes Cassandra's column family appear as a table in MariaDB that you
+can insert to, update, and select from. You can write joins against this table,
+it is possible to join data that's stored in MariaDB with data that's stored in
+Cassandra.")
+
+SET(CPACK_RPM_connect-engine_PACKAGE_SUMMARY "Connect storage engine for MariaDB")
+SET(CPACK_RPM_connect-engine_PACKAGE_DESCRIPTION "Connect engine supports a number of file formats (dbf, xml, txt, bin, etc),
+connections to ODBC tables and remote MySQL tables, as well as a number of
+other interesting features.")
+
+SET(CPACK_RPM_cracklib-password-check_PACKAGE_SUMMARY "CrackLib Password Validation Plugin for MariaDB")
+SET(CPACK_RPM_cracklib-password-check_PACKAGE_DESCRIPTION "This password validation plugin uses cracklib to allow only
+sufficiently secure (as defined by cracklib) user passwords in MariaDB.")
+
+SET(CPACK_RPM_gssapi-server_PACKAGE_SUMMARY "GSSAPI authentication plugin for MariaDB server")
+SET(CPACK_RPM_gssapi-server_PACKAGE_DESCRIPTION "The gssapi authentication plugin allows the user to authenticate with services
+that use the Generic Security Services Application Program Interface (GSSAPI).
+The gssapi authentication plugin is most often used for authenticating with Microsoft Active Directory.")
+
+SET(CPACK_RPM_oqgraph-engine_PACKAGE_SUMMARY "OQGraph storage engine for MariaDB")
+SET(CPACK_RPM_oqgraph-engine_PACKAGE_DESCRIPTION "The Open Query GRAPH computation engine, or OQGRAPH as the engine itself is called,
+allows you to handle hierarchies (tree structures) and complex graphs
+(nodes having many connections in several directions).
+It is intended to be used for retrieving hierarchical information, such as those used for graphs,
+routes or social relationships, in plain SQL.")
+
+SET(CPACK_RPM_rocksdb-engine_PACKAGE_SUMMARY "RocksDB storage engine for MariaDB")
+SET(CPACK_RPM_rocksdb-engine_PACKAGE_DESCRIPTION "The RocksDB storage engine is a high performance storage engine, aimed
+at maximising storage efficiency while maintaining InnoDB-like performance.")
+
+SET(CPACK_RPM_tokudb-engine_PACKAGE_SUMMARY "TokuDB storage engine for MariaDB")
+SET(CPACK_RPM_tokudb-engine_PACKAGE_DESCRIPTION "The TokuDB storage engine is for use in high-performance and write-intensive
+environments, offering increased compression and better performance based
+on fractal indexes.")
 
 SET(CPACK_RPM_SPEC_MORE_DEFINE "
 %define mysql_vendor ${CPACK_PACKAGE_VENDOR}
diff --git a/extra/mariabackup/ds_compress.cc b/extra/mariabackup/ds_compress.cc
index 3c28e55e1fe..514c86f5a17 100644
--- a/extra/mariabackup/ds_compress.cc
+++ b/extra/mariabackup/ds_compress.cc
@@ -370,6 +370,7 @@ create_worker_threads(uint n)
 				   thd)) {
 			msg("compress: pthread_create() failed: "
 			    "errno = %d", errno);
+			pthread_mutex_unlock(&thd->ctrl_mutex);
 			goto err;
 		}
 	}
@@ -386,6 +387,13 @@ create_worker_threads(uint n)
 	return threads;
 
 err:
+	while (i > 0) {
+		comp_thread_ctxt_t *thd;
+		i--;
+		thd = threads + i;
+		pthread_mutex_unlock(&thd->ctrl_mutex);
+	}
+
 	my_free(threads);
 	return NULL;
 }
diff --git a/mysql-test/lib/My/Debugger.pm b/mysql-test/lib/My/Debugger.pm
index cc151b233d5..8d09189e766 100644
--- a/mysql-test/lib/My/Debugger.pm
+++ b/mysql-test/lib/My/Debugger.pm
@@ -147,7 +147,8 @@ sub do_args($$$$$) {
   my %vars = (
     vardir => $::opt_vardir,
     exe => $$exe,
-    args => join(' ', map { quote_from_mtr $_ } @$$args, '--loose-gdb'),
+    args => join(' ', map { quote_from_mtr $_ } @$$args,
+                 '--loose-debug-gdb', '--loose-skip-stack-trace'),
     input => $input,
     script => "$::opt_vardir/tmp/${k}init.$type",
     log => "$::opt_vardir/log/$type.$k",
diff --git a/mysql-test/main/ctype_cp850.result b/mysql-test/main/ctype_cp850.result
index c028f72b58a..c6aba9d3f4e 100644
--- a/mysql-test/main/ctype_cp850.result
+++ b/mysql-test/main/ctype_cp850.result
@@ -12,3 +12,1053 @@ DROP TABLE t1;
 #
 # End of 5.5 tests
 #
+#
+# Start of 10.2 tests
+#
+#
+# MDEV-25610 Assertion `escape != -1' failed in Item_func_like::val_int
+#
+SET NAMES cp850;
+SELECT '' LIKE '' ESCAPE _cp850 0xFF;
+'' LIKE '' ESCAPE _cp850 0xFF
+1
+BEGIN NOT ATOMIC
+DECLARE ch INT DEFAULT 0x00;
+DECLARE query TEXT DEFAULT 'SELECT _cp850'''' LIKE _cp850'''' ESCAPE _cp850 0xFF';
+WHILE ch <= 0xFF DO
+SET @query= REPLACE(query, 'FF', CONV(ch, 10, 16));
+SELECT @query;
+PREPARE stmt FROM @query;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+SET ch=ch+1;
+END WHILE;
+END;
+$$
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x0
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x0
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x1
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x1
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x2
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x2
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x3
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x3
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x4
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x4
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x5
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x5
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x6
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x6
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x7
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x7
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x8
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x8
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x9
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x9
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0xA
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0xA
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0xB
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0xB
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0xC
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0xC
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0xD
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0xD
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0xE
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0xE
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0xF
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0xF
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x10
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x10
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x11
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x11
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x12
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x12
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x13
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x13
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x14
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x14
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x15
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x15
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x16
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x16
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x17
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x17
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x18
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x18
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x19
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x19
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x1A
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x1A
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x1B
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x1B
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x1C
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x1C
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x1D
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x1D
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x1E
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x1E
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x1F
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x1F
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x20
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x20
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x21
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x21
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x22
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x22
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x23
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x23
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x24
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x24
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x25
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x25
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x26
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x26
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x27
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x27
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x28
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x28
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x29
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x29
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x2A
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x2A
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x2B
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x2B
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x2C
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x2C
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x2D
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x2D
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x2E
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x2E
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x2F
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x2F
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x30
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x30
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x31
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x31
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x32
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x32
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x33
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x33
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x34
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x34
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x35
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x35
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x36
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x36
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x37
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x37
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x38
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x38
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x39
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x39
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x3A
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x3A
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x3B
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x3B
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x3C
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x3C
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x3D
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x3D
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x3E
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x3E
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x3F
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x3F
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x40
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x40
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x41
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x41
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x42
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x42
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x43
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x43
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x44
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x44
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x45
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x45
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x46
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x46
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x47
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x47
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x48
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x48
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x49
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x49
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x4A
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x4A
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x4B
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x4B
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x4C
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x4C
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x4D
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x4D
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x4E
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x4E
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x4F
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x4F
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x50
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x50
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x51
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x51
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x52
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x52
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x53
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x53
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x54
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x54
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x55
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x55
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x56
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x56
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x57
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x57
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x58
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x58
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x59
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x59
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x5A
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x5A
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0x5B
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0x5B
+1
+@query
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+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0xFE
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0xFE
+1
+@query
+SELECT _cp850'' LIKE _cp850'' ESCAPE _cp850 0xFF
+_cp850'' LIKE _cp850'' ESCAPE _cp850 0xFF
+1
+#
+# End of 10.2 tests
+#
diff --git a/mysql-test/main/ctype_cp850.test b/mysql-test/main/ctype_cp850.test
index 358829eb351..d2fac6f3646 100644
--- a/mysql-test/main/ctype_cp850.test
+++ b/mysql-test/main/ctype_cp850.test
@@ -14,3 +14,35 @@ DROP TABLE t1;
 --echo #
 --echo # End of 5.5 tests
 --echo #
+
+--echo #
+--echo # Start of 10.2 tests
+--echo #
+
+--echo #
+--echo # MDEV-25610 Assertion `escape != -1' failed in Item_func_like::val_int
+--echo #
+
+SET NAMES cp850;
+SELECT '' LIKE '' ESCAPE _cp850 0xFF;
+
+DELIMITER $$;
+BEGIN NOT ATOMIC
+  DECLARE ch INT DEFAULT 0x00;
+  DECLARE query TEXT DEFAULT 'SELECT _cp850'''' LIKE _cp850'''' ESCAPE _cp850 0xFF';
+  WHILE ch <= 0xFF DO
+    SET @query= REPLACE(query, 'FF', CONV(ch, 10, 16));
+    SELECT @query;
+    PREPARE stmt FROM @query;
+    EXECUTE stmt;
+    DEALLOCATE PREPARE stmt;
+    SET ch=ch+1;
+  END WHILE;
+END;
+$$
+DELIMITER ;$$
+
+
+--echo #
+--echo # End of 10.2 tests
+--echo #
diff --git a/mysql-test/main/ctype_cp866.result b/mysql-test/main/ctype_cp866.result
new file mode 100644
index 00000000000..008f94f3c79
--- /dev/null
+++ b/mysql-test/main/ctype_cp866.result
@@ -0,0 +1,12 @@
+#
+# Start of 10.2 tests
+#
+#
+# MDEV-25610 Assertion `escape != -1' failed in Item_func_like::val_int
+#
+SELECT _cp866'' LIKE _cp866'' ESCAPE _cp866 0xFF;
+_cp866'' LIKE _cp866'' ESCAPE _cp866 0xFF
+1
+#
+# End of 10.2 tests
+#
diff --git a/mysql-test/main/ctype_cp866.test b/mysql-test/main/ctype_cp866.test
new file mode 100644
index 00000000000..cdc694d2fc7
--- /dev/null
+++ b/mysql-test/main/ctype_cp866.test
@@ -0,0 +1,14 @@
+--echo #
+--echo # Start of 10.2 tests
+--echo #
+
+--echo #
+--echo # MDEV-25610 Assertion `escape != -1' failed in Item_func_like::val_int
+--echo #
+
+SELECT _cp866'' LIKE _cp866'' ESCAPE _cp866 0xFF;
+
+
+--echo #
+--echo # End of 10.2 tests
+--echo #
diff --git a/mysql-test/main/ctype_tis620.result b/mysql-test/main/ctype_tis620.result
index 9650c366d38..d0c30a112e3 100644
--- a/mysql-test/main/ctype_tis620.result
+++ b/mysql-test/main/ctype_tis620.result
@@ -4421,5 +4421,14 @@ DROP TABLE t1;
 #
 SET STORAGE_ENGINE=Default;
 #
+# MDEV-24901 SIGSEGV in fts_get_table_name, SIGSEGV in ib_vector_size, SIGSEGV in row_merge_fts_doc_tokenize, stack smashing
+#
+SELECT HEX(WEIGHT_STRING(_tis620 'a\0b'));
+HEX(WEIGHT_STRING(_tis620 'a\0b'))
+610062
+SELECT HEX(WEIGHT_STRING(_tis620 'a\0b' COLLATE tis620_thai_nopad_ci));
+HEX(WEIGHT_STRING(_tis620 'a\0b' COLLATE tis620_thai_nopad_ci))
+610062
+#
 # End of 10.2 tests
 #
diff --git a/mysql-test/main/ctype_tis620.test b/mysql-test/main/ctype_tis620.test
index 7bc248aec2b..7f6382fe7bc 100644
--- a/mysql-test/main/ctype_tis620.test
+++ b/mysql-test/main/ctype_tis620.test
@@ -210,5 +210,12 @@ let $coll_pad='tis620_bin';
 --source include/ctype_pad_all_engines.inc
 
 --echo #
+--echo # MDEV-24901 SIGSEGV in fts_get_table_name, SIGSEGV in ib_vector_size, SIGSEGV in row_merge_fts_doc_tokenize, stack smashing
+--echo #
+
+SELECT HEX(WEIGHT_STRING(_tis620 'a\0b'));
+SELECT HEX(WEIGHT_STRING(_tis620 'a\0b' COLLATE tis620_thai_nopad_ci));
+
+--echo #
 --echo # End of 10.2 tests
 --echo #
diff --git a/mysql-test/main/ctype_utf8.result b/mysql-test/main/ctype_utf8.result
index 3efa008abe8..9a7bb2119ae 100644
--- a/mysql-test/main/ctype_utf8.result
+++ b/mysql-test/main/ctype_utf8.result
@@ -11256,6 +11256,17 @@ DROP TABLE kv;
 DROP VIEW v1;
 SET NAMES utf8;
 #
+# MDEV-24335 Unexpected question mark in the end of a TINYTEXT column
+#
+CREATE TABLE t1 (a TINYTEXT character set utf8);
+INSERT IGNORE INTO t1 VALUES (REPEAT(_utf8 0xD184, 250));
+Warnings:
+Warning	1366	Incorrect string value: '\xD1\x84\xD1\x84\xD1\x84...' for column `test`.`t1`.`a` at row 1
+SELECT LENGTH(a), CHAR_LENGTH(a), RIGHT(a,3) FROM t1;
+LENGTH(a)	CHAR_LENGTH(a)	RIGHT(a,3)
+254	127	ффф
+DROP TABLE t1;
+#
 # End of 10.2 tests
 #
 #
diff --git a/mysql-test/main/ctype_utf8.test b/mysql-test/main/ctype_utf8.test
index 2e1f1e230f1..e2c47e75993 100644
--- a/mysql-test/main/ctype_utf8.test
+++ b/mysql-test/main/ctype_utf8.test
@@ -2184,6 +2184,15 @@ DROP VIEW v1;
 SET NAMES utf8;
 
 --echo #
+--echo # MDEV-24335 Unexpected question mark in the end of a TINYTEXT column
+--echo #
+
+CREATE TABLE t1 (a TINYTEXT character set utf8);
+INSERT IGNORE INTO t1 VALUES (REPEAT(_utf8 0xD184, 250));
+SELECT LENGTH(a), CHAR_LENGTH(a), RIGHT(a,3) FROM t1;
+DROP TABLE t1;
+
+--echo #
 --echo # End of 10.2 tests
 --echo #
 
diff --git a/mysql-test/suite/encryption/r/encrypt_and_grep.result b/mysql-test/suite/encryption/r/encrypt_and_grep.result
index e5ba46d10d2..72d612eeac8 100644
--- a/mysql-test/suite/encryption/r/encrypt_and_grep.result
+++ b/mysql-test/suite/encryption/r/encrypt_and_grep.result
@@ -19,6 +19,7 @@ mysql/innodb_table_stats
 mysql/transaction_registry
 test/t1
 test/t2
+FLUSH TABLES t1,t2,t3 FOR EXPORT;
 # t1 yes on expecting NOT FOUND
 NOT FOUND /foobarsecret/ in t1.ibd
 # t2 ... on expecting NOT FOUND
@@ -27,6 +28,7 @@ NOT FOUND /tempsecret/ in t2.ibd
 FOUND 12 /dummysecret/ in t3.ibd
 # ibdata1 expecting NOT FOUND
 NOT FOUND /foobarsecret/ in ibdata1
+UNLOCK TABLES;
 # 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 decrypt all spaces
@@ -41,6 +43,7 @@ test/t3
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 NAME
 test/t1
+FLUSH TABLES t1,t2,t3 FOR EXPORT;
 # t1 yes on expecting NOT FOUND
 NOT FOUND /foobarsecret/ in t1.ibd
 # t2 ... default expecting FOUND
@@ -49,6 +52,7 @@ FOUND 12 /tempsecret/ in t2.ibd
 FOUND 12 /dummysecret/ in t3.ibd
 # ibdata1 expecting NOT FOUND
 NOT FOUND /foobarsecret/ in ibdata1
+UNLOCK TABLES;
 # Now turn on encryption and wait for threads to encrypt all spaces
 SET GLOBAL innodb_encrypt_tables = on;
 # Wait max 10 min for key encryption threads to encrypt all spaces
@@ -63,6 +67,7 @@ mysql/innodb_table_stats
 mysql/transaction_registry
 test/t1
 test/t2
+FLUSH TABLES t1,t2,t3 FOR EXPORT;
 # t1 yes on expecting NOT FOUND
 NOT FOUND /foobarsecret/ in t1.ibd
 # t2 ... on expecting NOT FOUND
@@ -71,4 +76,5 @@ NOT FOUND /tempsecret/ in t2.ibd
 FOUND 12 /dummysecret/ in t3.ibd
 # ibdata1 expecting NOT FOUND
 NOT FOUND /foobarsecret/ in ibdata1
+UNLOCK TABLES;
 drop table t1, t2, t3;
diff --git a/mysql-test/suite/encryption/t/encrypt_and_grep.test b/mysql-test/suite/encryption/t/encrypt_and_grep.test
index 5fec86304b4..03f67db83f9 100644
--- a/mysql-test/suite/encryption/t/encrypt_and_grep.test
+++ b/mysql-test/suite/encryption/t/encrypt_and_grep.test
@@ -1,9 +1,6 @@
 -- source include/have_innodb.inc
 -- source include/have_file_key_management_plugin.inc
 
-# embedded does not support restart
--- source include/not_embedded.inc
-
 #
 # MDEV-8138: strange results from encrypt-and-grep test
 #
@@ -35,7 +32,7 @@ SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_
 --sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 
---source include/shutdown_mysqld.inc
+FLUSH TABLES t1,t2,t3 FOR EXPORT;
 
 --let SEARCH_PATTERN=foobarsecret
 --echo # t1 yes on expecting NOT FOUND
@@ -54,7 +51,7 @@ SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_
 -- let SEARCH_FILE=$ib1_IBD
 -- source include/search_pattern_in_file.inc
 
--- source include/start_mysqld.inc
+UNLOCK TABLES;
 
 --echo # Now turn off encryption and wait for threads to decrypt everything
 
@@ -71,7 +68,7 @@ SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_
 --sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 
---source include/shutdown_mysqld.inc
+FLUSH TABLES t1,t2,t3 FOR EXPORT;
 
 --let SEARCH_PATTERN=foobarsecret
 --echo # t1 yes on expecting NOT FOUND
@@ -90,8 +87,7 @@ SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_
 -- let SEARCH_FILE=$ib1_IBD
 -- source include/search_pattern_in_file.inc
 
-
--- source include/start_mysqld.inc
+UNLOCK TABLES;
 
 --echo # Now turn on encryption and wait for threads to encrypt all spaces
 SET GLOBAL innodb_encrypt_tables = on;
@@ -106,7 +102,7 @@ SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_
 --sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 
---source include/shutdown_mysqld.inc
+FLUSH TABLES t1,t2,t3 FOR EXPORT;
 
 --let SEARCH_PATTERN=foobarsecret
 --echo # t1 yes on expecting NOT FOUND
@@ -125,6 +121,6 @@ SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_
 -- let SEARCH_FILE=$ib1_IBD
 -- source include/search_pattern_in_file.inc
 
--- source include/start_mysqld.inc
+UNLOCK TABLES;
 
 drop table t1, t2, t3;
diff --git a/mysql-test/suite/innodb/r/innodb_ctype_tis620.result b/mysql-test/suite/innodb/r/innodb_ctype_tis620.result
new file mode 100644
index 00000000000..164212097bd
--- /dev/null
+++ b/mysql-test/suite/innodb/r/innodb_ctype_tis620.result
@@ -0,0 +1,28 @@
+SET STORAGE_ENGINE=InnoDB;
+#
+# Start of 10.2 tests
+#
+#
+#  MDEV-24901 SIGSEGV in fts_get_table_name, SIGSEGV in ib_vector_size, SIGSEGV in row_merge_fts_doc_tokenize, stack smashing Export
+#
+CREATE TABLE t1(c TEXT CHARACTER SET tis620);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c` text CHARACTER SET tis620 DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+INSERT INTO t1 VALUES('100');
+ALTER TABLE t1 ADD FULLTEXT INDEX(c), ALGORITHM=INPLACE;
+DROP TABLE t1;
+CREATE TABLE t1(c TEXT CHARACTER SET tis620 COLLATE tis620_thai_nopad_ci);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c` text CHARACTER SET tis620 COLLATE tis620_thai_nopad_ci DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+INSERT INTO t1 VALUES('100');
+ALTER TABLE t1 ADD FULLTEXT INDEX(c), ALGORITHM=INPLACE;
+DROP TABLE t1;
+#
+# End of 10.2 tests
+#
diff --git a/mysql-test/suite/innodb/t/innodb_ctype_tis620.test b/mysql-test/suite/innodb/t/innodb_ctype_tis620.test
new file mode 100644
index 00000000000..fee1b283ac3
--- /dev/null
+++ b/mysql-test/suite/innodb/t/innodb_ctype_tis620.test
@@ -0,0 +1,29 @@
+--source include/have_innodb.inc
+--source include/have_tis620.inc
+
+SET STORAGE_ENGINE=InnoDB;
+
+--echo #
+--echo # Start of 10.2 tests
+--echo #
+
+--echo #
+--echo #  MDEV-24901 SIGSEGV in fts_get_table_name, SIGSEGV in ib_vector_size, SIGSEGV in row_merge_fts_doc_tokenize, stack smashing Export
+--echo #
+
+CREATE TABLE t1(c TEXT CHARACTER SET tis620);
+SHOW CREATE TABLE t1;
+INSERT INTO t1 VALUES('100');
+ALTER TABLE t1 ADD FULLTEXT INDEX(c), ALGORITHM=INPLACE;
+DROP TABLE t1;
+
+CREATE TABLE t1(c TEXT CHARACTER SET tis620 COLLATE tis620_thai_nopad_ci);
+SHOW CREATE TABLE t1;
+INSERT INTO t1 VALUES('100');
+ALTER TABLE t1 ADD FULLTEXT INDEX(c), ALGORITHM=INPLACE;
+DROP TABLE t1;
+
+
+--echo #
+--echo # End of 10.2 tests
+--echo #
diff --git a/mysql-test/suite/maria/maria.result b/mysql-test/suite/maria/maria.result
index dccb8e5314f..2a0317d504d 100644
--- a/mysql-test/suite/maria/maria.result
+++ b/mysql-test/suite/maria/maria.result
@@ -2871,3 +2871,14 @@ insert into t1 values (8,'0');
 ERROR HY000: Table 't1' was locked with a READ lock and can't be updated
 unlock tables;
 drop table t1;
+#
+# MDEV-22284 Aria table key read crash because wrong index used
+#
+create table t1 (
+a int auto_increment,
+b int, c int,
+key(c, a), unique(b)
+) engine aria
+partition by hash (b);
+replace into t1 values (1, 0, 0), (2, 0, 0), (0, 0, 0);
+drop table t1;
diff --git a/mysql-test/suite/maria/maria.test b/mysql-test/suite/maria/maria.test
index 19aab4aa944..e0d9d2addc7 100644
--- a/mysql-test/suite/maria/maria.test
+++ b/mysql-test/suite/maria/maria.test
@@ -2092,3 +2092,16 @@ aria_page_checksum=$default_checksum,
 aria_log_file_size=$default_log_file_size;
 --enable_result_log
 --enable_query_log
+
+--echo #
+--echo # MDEV-22284 Aria table key read crash because wrong index used
+--echo #
+create table t1 (
+    a int auto_increment,
+    b int, c int,
+    key(c, a), unique(b)
+) engine aria
+partition by hash (b);
+replace into t1 values (1, 0, 0), (2, 0, 0), (0, 0, 0);
+# cleanup
+drop table t1;
diff --git a/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test b/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
index 02665c70b9e..c44bfa80ad4 100644
--- a/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
+++ b/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
@@ -8,6 +8,7 @@
 # Finish the following tests by calling its common test script:  
 # include/rpl_get_master_version_and_clock.test. 
 
+source include/not_valgrind.inc;
 source include/have_debug.inc;
 source include/have_debug_sync.inc;
 source include/master-slave.inc;
diff --git a/mysql-test/suite/rpl/t/rpl_row_big_table_id.test b/mysql-test/suite/rpl/t/rpl_row_big_table_id.test
index abf22cc876e..d898e894bc6 100644
--- a/mysql-test/suite/rpl/t/rpl_row_big_table_id.test
+++ b/mysql-test/suite/rpl/t/rpl_row_big_table_id.test
@@ -7,6 +7,7 @@
 # Verify row-based events applying when table map id value is about and greater
 # than 1 << 32.
 ##################################################################
+--source include/not_valgrind.inc
 --source include/word_size.inc
 --source include/have_debug.inc
 --source include/have_binlog_format_row.inc
diff --git a/sql/item.h b/sql/item.h
index 0e1a5d99a6e..099eb503d6c 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -6843,6 +6843,19 @@ public:
 
 
 /*
+  fix_escape_item() sets the out "escape" parameter to:
+  - native code in case of an 8bit character set
+  - Unicode code point in case of a multi-byte character set
+
+  The value meaning a not-initialized ESCAPE character must not be equal to
+  any valid value, so must be outside of these ranges:
+  - -128..+127, not to conflict with a valid 8bit charcter
+  - 0..0x10FFFF, not to conflict with a valid Unicode code point
+  The exact value does not matter.
+*/
+#define ESCAPE_NOT_INITIALIZED -1000
+
+/*
   It's used in ::fix_fields() methods of LIKE and JSON_SEARCH
   functions to handle the ESCAPE parameter.
   This parameter is quite non-standard so the specific function.
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index 9ebd765f1b2..38f0a285e84 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -5251,7 +5251,7 @@ void Item_func_like::print(String *str, enum_query_type query_type)
 longlong Item_func_like::val_int()
 {
   DBUG_ASSERT(fixed == 1);
-  DBUG_ASSERT(escape != -1);
+  DBUG_ASSERT(escape != ESCAPE_NOT_INITIALIZED);
   String* res= args[0]->val_str(&cmp_value1);
   if (args[0]->null_value)
   {
@@ -5355,7 +5355,7 @@ bool fix_escape_item(THD *thd, Item *escape_item, String *tmp_str,
     return TRUE;
   }
 
-  IF_DBUG(*escape= -1,);
+  IF_DBUG(*escape= ESCAPE_NOT_INITIALIZED,);
 
   if (escape_item->const_item())
   {
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index a00b3004cc1..575aafa416b 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -9884,7 +9884,6 @@ static int get_options(int *argc_ptr, char ***argv_ptr)
   {
     /* Allow break with SIGINT, no core or stack trace */
     test_flags|= TEST_SIGINT;
-    opt_stack_trace= 1;
     test_flags&= ~TEST_CORE_ON_SIGNAL;
   }
   /* Set global MyISAM variables from delay_key_write_options */
diff --git a/storage/innobase/pars/pars0grm.cc b/storage/innobase/pars/pars0grm.cc
index 10d0d0becd7..1e10a61f5ad 100644
--- a/storage/innobase/pars/pars0grm.cc
+++ b/storage/innobase/pars/pars0grm.cc
@@ -79,7 +79,7 @@ que_node_t */
 #include "que0que.h"
 #include "row0sel.h"
 
-#ifdef __GNUC__
+#if defined __GNUC__ && (!defined __clang_major__ || __clang_major__ > 11)
 #pragma GCC diagnostic ignored "-Wfree-nonheap-object"
 #endif
 
diff --git a/storage/innobase/pars/pars0grm.y b/storage/innobase/pars/pars0grm.y
index 3fb0865f608..ed2b9bc09b0 100644
--- a/storage/innobase/pars/pars0grm.y
+++ b/storage/innobase/pars/pars0grm.y
@@ -38,7 +38,7 @@ que_node_t */
 #include "que0que.h"
 #include "row0sel.h"
 
-#ifdef __GNUC__
+#if defined __GNUC__ && (!defined __clang_major__ || __clang_major__ > 11)
 #pragma GCC diagnostic ignored "-Wfree-nonheap-object"
 #endif
 
diff --git a/storage/maria/ma_extra.c b/storage/maria/ma_extra.c
index c2ac4d588a9..9abcab81107 100644
--- a/storage/maria/ma_extra.c
+++ b/storage/maria/ma_extra.c
@@ -210,7 +210,13 @@ int maria_extra(MARIA_HA *info, enum ha_extra_function function,
 	    info->last_key.data + share->base.max_key_length*2,
 	    info->save_lastkey_data_length + info->save_lastkey_ref_length);
       info->update=	info->save_update | HA_STATE_WRITTEN;
-      info->lastinx=	info->save_lastinx;
+      if (info->lastinx != info->save_lastinx)             /* Index changed */
+      {
+        info->lastinx = info->save_lastinx;
+        info->last_key.keyinfo= info->s->keyinfo + info->lastinx;
+        info->last_key.flag= 0;
+        info->page_changed=1;
+      }
       info->cur_row.lastpos= info->save_lastpos;
       info->last_key.data_length= info->save_lastkey_data_length;
       info->last_key.ref_length= info->save_lastkey_ref_length;
diff --git a/strings/ctype-mb.c b/strings/ctype-mb.c
index a890c147055..fc882d087fb 100644
--- a/strings/ctype-mb.c
+++ b/strings/ctype-mb.c
@@ -401,10 +401,10 @@ my_copy_fix_mb(CHARSET_INFO *cs,
   size_t well_formed_nchars;
   size_t well_formed_length;
   size_t fixed_length;
+  size_t min_length= MY_MIN(src_length, dst_length);
 
-  set_if_smaller(src_length, dst_length);
   well_formed_nchars= cs->cset->well_formed_char_length(cs,
-                                                        src, src + src_length,
+                                                        src, src + min_length,
                                                         nchars, status);
   DBUG_ASSERT(well_formed_nchars <= nchars);
   well_formed_length= status->m_source_end_pos - src;
diff --git a/strings/ctype-tis620.c b/strings/ctype-tis620.c
index afc5771d6c5..9760ea25162 100644
--- a/strings/ctype-tis620.c
+++ b/strings/ctype-tis620.c
@@ -605,8 +605,8 @@ my_strnxfrm_tis620(CHARSET_INFO *cs,
                    const uchar *src, size_t srclen, uint flags)
 {
   size_t len, dstlen0= dstlen;
-  len= (uint) (strmake((char*) dst, (char*) src, MY_MIN(dstlen, srclen)) -
-	               (char*) dst);
+  len= MY_MIN(dstlen, srclen);
+  memcpy(dst, src, len);
   len= thai2sortable(dst, len);
   set_if_smaller(dstlen, nweights);
   set_if_smaller(len, dstlen); 
@@ -628,8 +628,8 @@ my_strnxfrm_tis620_nopad(CHARSET_INFO *cs,
                          const uchar *src, size_t srclen, uint flags)
 {
   size_t len, dstlen0= dstlen;
-  len= (uint) (strmake((char*) dst, (char*) src, MY_MIN(dstlen, srclen)) -
-	               (char*) dst);
+  len= MY_MIN(dstlen, srclen);
+  memcpy(dst, src, len);
   len= thai2sortable(dst, len);
   set_if_smaller(dstlen, nweights);
   set_if_smaller(len, dstlen);