diff --git a/include/my_cpu.h b/include/my_cpu.h
index e536ff285f9..003087dd94d 100644
--- a/include/my_cpu.h
+++ b/include/my_cpu.h
@@ -24,6 +24,7 @@
 */
 
 #ifdef _ARCH_PWR8
+#ifdef __GLIBC__
 #include <sys/platform/ppc.h>
 /* Very low priority */
 #define HMT_very_low() __ppc_set_ppr_very_low()
@@ -37,6 +38,18 @@
 #define HMT_medium_high() __ppc_set_ppr_med_high()
 /* High priority */
 #define HMT_high() asm volatile("or 3,3,3")
+#else /* GLIBC */
+#if defined(__FreeBSD__)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+#define HMT_very_low() __asm__ volatile ("or 31,31,31")
+#define HMT_low() __asm__ volatile ("or 1,1,1")
+#define HMT_medium_low() __asm__ volatile ("or 6,6,6")
+#define HMT_medium() __asm__ volatile ("or 2,2,2")
+#define HMT_medium_high() __asm__ volatile ("or 5,5,5")
+#define HMT_high() asm volatile("or 3,3,3")
+#endif /* GLIBC */
 #else
 #define HMT_very_low()
 #define HMT_low()
@@ -81,7 +94,13 @@ static inline void MY_RELAX_CPU(void)
   __asm__ __volatile__ ("pause");
 #endif
 #elif defined(_ARCH_PWR8)
-  __ppc_get_timebase();
+#ifdef __FreeBSD__
+  uint64_t __tb;
+  __asm__ volatile ("mfspr %0, 268" : "=r" (__tb));
+#else
+  /* Changed from __ppc_get_timebase for musl compatibility */
+  __builtin_ppc_get_timebase();
+#endif
 #elif defined __GNUC__ && (defined __arm__ || defined __aarch64__)
   /* Mainly, prevent the compiler from optimizing away delay loops */
   __asm__ __volatile__ ("":::"memory");
diff --git a/mysql-test/main/join.result b/mysql-test/main/join.result
index b5789142fee..d7e8a746a8c 100644
--- a/mysql-test/main/join.result
+++ b/mysql-test/main/join.result
@@ -3495,3 +3495,87 @@ a	b	c
 SET OPTIMIZER_USE_CONDITION_SELECTIVITY=@tmp;
 DROP TABLE t1,t2;
 # End of 10.6 tests
+#
+# MDEV-34894: Poor query plan, because range estimates are not reused for ref(const)
+#
+create table t0 (
+a int,
+b int,
+dummy int
+);
+insert into t0 select seq,seq,seq from seq_1_to_10;
+create table t1 (
+pk1 int,
+pk2 int,
+pk3 int,
+key1 int,
+key(key1),
+filler char(100),
+primary key(pk1,pk2,pk3)
+);
+insert into t1
+select
+seq, seq, seq,
+FLOOR(seq/2),
+'filler-data'
+from seq_1_to_10000;
+analyze table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Engine-independent statistics collected
+test.t1	analyze	status	OK
+update t1 set pk1=1 where pk1 between 1 and 200;
+explain select * from t1 where pk1=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	const	231	
+explain select * from t0,t1 where t1.pk1=t0.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	test.t0.a	1	
+create table t2 (
+col int
+);
+insert into t2 select seq from seq_1_to_10000;
+set optimizer_adjust_secondary_key_costs='fix_reuse_range_for_ref';
+# This must use this good query plan:
+#  t0 - ALL
+#  t1 - ref, key=key1, not PRIMARY as pk1=1 is true for 20% of all rows
+#  t2 - ALL
+explain select * from t0, t1, t2
+where
+t1.pk1=1 and t1.pk2=t2.col and t1.pk3=t0.dummy and
+t1.key1=t0.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	SIMPLE	t1	ref	PRIMARY,key1	key1	5	test.t0.b	1	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10000	Using where; Using join buffer (flat, BNL join)
+set optimizer_adjust_secondary_key_costs='';
+# Bad query:
+#  t0 - ALL
+#  t1 - ref, key=PRIMARY
+#  t2 - ALL
+explain select * from t0, t1, t2
+where
+t1.pk1=1 and t1.pk2=t2.col and t1.pk3=t0.dummy and
+t1.key1=t0.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	10	
+1	SIMPLE	t1	ref	PRIMARY,key1	PRIMARY	4	const	1	Using index condition; Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10000	Using where; Using join buffer (flat, BNL join)
+drop table t0,t1,t2;
+set @@optimizer_adjust_secondary_key_costs="fix_reuse_range_for_ref";
+CREATE OR REPLACE TABLE t1 (a INT NOT NULL, b INT NOT NULL, c INT, key(a,b,c)) ENGINE=Aria;
+INSERT INTO t1 select seq/10,mod(seq,2),seq from seq_1_to_1000;
+update t1 set a=10 WHERE c < 100;
+update t1 set a=12 WHERE a=11;
+insert into t1 values (11,1,11), (11,2,11);
+create or replace table t2 select seq from seq_1_to_10;
+explain select count(*) from t1, t2 as seq where a=10 and b=seq.seq;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	seq	ALL	NULL	NULL	NULL	NULL	10	
+1	SIMPLE	t1	ref	a	a	8	const,test.seq.seq	5	Using where; Using index
+explain select count(*) from t1, t2 as seq where a=11 and b=seq.seq;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	a	a	4	const	2	Using index
+1	SIMPLE	seq	ALL	NULL	NULL	NULL	NULL	10	Using where; Using join buffer (flat, BNL join)
+drop table t1,t2;
+set @@optimizer_adjust_secondary_key_costs=default;
diff --git a/mysql-test/main/join.test b/mysql-test/main/join.test
index a4d34f41649..f5fb28985b9 100644
--- a/mysql-test/main/join.test
+++ b/mysql-test/main/join.test
@@ -1904,3 +1904,81 @@ SELECT * FROM
 SET OPTIMIZER_USE_CONDITION_SELECTIVITY=@tmp;
 DROP TABLE t1,t2;
 --echo # End of 10.6 tests
+
+--source include/have_sequence.inc
+
+--echo #
+--echo # MDEV-34894: Poor query plan, because range estimates are not reused for ref(const)
+--echo #
+create table t0 (
+  a int,
+  b int,
+  dummy int
+);
+insert into t0 select seq,seq,seq from seq_1_to_10;
+
+create table t1 (
+  pk1 int,
+  pk2 int,
+  pk3 int,
+  key1 int,
+  key(key1),
+  filler char(100),
+  primary key(pk1,pk2,pk3)
+);
+
+insert into t1
+select
+  seq, seq, seq,
+  FLOOR(seq/2),
+  'filler-data'
+from seq_1_to_10000;
+analyze table t1;
+
+update t1 set pk1=1 where pk1 between 1 and 200;
+
+explain select * from t1 where pk1=1;
+
+explain select * from t0,t1 where t1.pk1=t0.a;
+
+create table t2 (
+ col int
+);
+insert into t2 select seq from seq_1_to_10000;
+
+set optimizer_adjust_secondary_key_costs='fix_reuse_range_for_ref';
+--echo # This must use this good query plan:
+--echo #  t0 - ALL
+--echo #  t1 - ref, key=key1, not PRIMARY as pk1=1 is true for 20% of all rows
+--echo #  t2 - ALL
+explain select * from t0, t1, t2
+where
+  t1.pk1=1 and t1.pk2=t2.col and t1.pk3=t0.dummy and
+  t1.key1=t0.b;
+
+set optimizer_adjust_secondary_key_costs='';
+--echo # Bad query:
+--echo #  t0 - ALL
+--echo #  t1 - ref, key=PRIMARY
+--echo #  t2 - ALL
+explain select * from t0, t1, t2
+where
+  t1.pk1=1 and t1.pk2=t2.col and t1.pk3=t0.dummy and
+  t1.key1=t0.b;
+
+drop table t0,t1,t2;
+
+set @@optimizer_adjust_secondary_key_costs="fix_reuse_range_for_ref";
+CREATE OR REPLACE TABLE t1 (a INT NOT NULL, b INT NOT NULL, c INT, key(a,b,c)) ENGINE=Aria;
+INSERT INTO t1 select seq/10,mod(seq,2),seq from seq_1_to_1000;
+update t1 set a=10 WHERE c < 100;
+update t1 set a=12 WHERE a=11;
+insert into t1 values (11,1,11), (11,2,11);
+create or replace table t2 select seq from seq_1_to_10;
+
+explain select count(*) from t1, t2 as seq where a=10 and b=seq.seq;
+# This will execute code in ReuseRangeEstimateForRef-4
+explain select count(*) from t1, t2 as seq where a=11 and b=seq.seq;
+drop table t1,t2;
+
+set @@optimizer_adjust_secondary_key_costs=default;
diff --git a/mysql-test/main/mysqld--help.result b/mysql-test/main/mysqld--help.result
index 10945400e75..cc16fdaf981 100644
--- a/mysql-test/main/mysqld--help.result
+++ b/mysql-test/main/mysqld--help.result
@@ -745,8 +745,10 @@ The following specify which files/extra groups are read (specified before remain
  disable_forced_index_in_group_by = Disable automatic
  forced index in GROUP BY. fix_innodb_cardinality =
  Disable doubling of the Cardinality for InnoDB secondary
- keys. This variable will be deleted in MariaDB 11.0 as it
- is not needed with the new 11.0 optimizer.
+ keys. fix_reuse_range_for_ref = Do a better job at
+ reusing range access estimates when estimating ref
+ access. This variable will be deleted in MariaDB 11.0 as
+ it is not needed with the new 11.0 optimizer.
  Use 'ALL' to set all combinations.
  --optimizer-extra-pruning-depth=# 
  If the optimizer needs to enumerate join prefix of this
@@ -1746,7 +1748,7 @@ old-alter-table DEFAULT
 old-mode UTF8_IS_UTF8MB3
 old-passwords FALSE
 old-style-user-limits FALSE
-optimizer-adjust-secondary-key-costs 
+optimizer-adjust-secondary-key-costs fix_reuse_range_for_ref
 optimizer-extra-pruning-depth 8
 optimizer-join-limit-pref-ratio 0
 optimizer-max-sel-arg-weight 32000
diff --git a/mysql-test/main/opt_trace.result b/mysql-test/main/opt_trace.result
index b2359c7f0b2..9a69eed4eee 100644
--- a/mysql-test/main/opt_trace.result
+++ b/mysql-test/main/opt_trace.result
@@ -10854,8 +10854,6 @@ S
 {
     "access_type": "ref",
     "index": "PRIMARY",
-    "rows": 1.79769e308,
-    "cost": 1.79769e308,
     "chosen": false,
     "cause": "no predicate for first keypart"
 }
diff --git a/mysql-test/main/ps_mem_leaks.result b/mysql-test/main/ps_mem_leaks.result
index e647c89b740..c5b1a744ebf 100644
--- a/mysql-test/main/ps_mem_leaks.result
+++ b/mysql-test/main/ps_mem_leaks.result
@@ -90,6 +90,243 @@ DEALLOCATE PREPARE stmt;
 DROP TABLE t1;
 # End of 10.4 tests
 #
+# MDEV-34447: Memory leakage is detected on running the test main.ps against the server 11.1
+#
+CREATE TABLE t1 (id INT, value INT);
+CREATE TABLE t2 (id INT);
+PREPARE stmt FROM 'UPDATE t1 SET value = (SELECT 1 FROM t2 WHERE id = t1.id)';
+EXECUTE stmt;
+INSERT INTO t1 VALUES (1,10),(2,10),(3,10);
+INSERT INTO t2 VALUES (1),(2);
+EXECUTE stmt;
+SELECT * FROM t1;
+id	value
+1	1
+2	1
+3	NULL
+DEALLOCATE PREPARE stmt;
+DROP TABLE t1, t2;
+# Memory leak also could take place on running the DELETE statement
+# with the LIMIT clause. Check it.
+CREATE TABLE t1 (c1 INT);
+INSERT INTO t1 (c1) VALUES (1), (2), (3);
+CREATE PROCEDURE p1(p1 INT)
+DELETE FROM t1 LIMIT p1;
+CALL p1(0);
+CALL p1(1);
+CALL p1(2);
+# Clean up
+DROP TABLE t1;
+DROP PROCEDURE p1;
+#
+# MDEV-34757: assertion of (mem_root->flags & 4) == 0 fails in 2nd ps execution with partition pruning
+#
+CREATE TABLE t1 (id INT, value INT);
+CREATE TABLE t2 (id INT);
+PREPARE stmt FROM 'EXPLAIN UPDATE t1 SET value = (SELECT 1 FROM t2 WHERE id = t1.id)';
+EXECUTE stmt;
+INSERT INTO t1 VALUES (1,10),(2,10),(3,10);
+INSERT INTO t2 VALUES (1),(2);
+EXECUTE stmt;
+SELECT * FROM t1;
+id	value
+1	10
+2	10
+3	10
+DEALLOCATE PREPARE stmt;
+DROP TABLE t1, t2;
+set @var1=5;
+set @var2=4;
+create table t1 (a int) partition by list(a) (
+partition p0 values in (null,1,2),
+partition p1 values in (3,4)
+);
+create table t2 (a int);
+insert into t1 values (1),(2),(3),(4);
+insert into t2 values (4);
+PREPARE stmt FROM 'UPDATE t1 t1 SET a = (SELECT 1 FROM t2 WHERE a = t1.a) where a = ?';
+execute stmt using @var1;
+select * from t1;
+a
+1
+2
+3
+4
+execute stmt using @var2;
+select * from t1;
+a
+1
+2
+1
+3
+deallocate prepare stmt;
+drop table t1, t2;
+set @var1=5;
+set @var2=4;
+create table t1 (a int) partition by list(a) (
+partition p0 values in (null,1,2),
+partition p1 values in (3,4)
+);
+create table t2 (a int);
+insert into t1 values (1),(2),(3),(4);
+insert into t2 values (4);
+PREPARE stmt FROM 'EXPLAIN UPDATE t1 t1 SET a = (SELECT 1 FROM t2 WHERE a = t1.a) where a = ?';
+execute stmt using @var1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No matching rows after partition pruning
+select * from t1;
+a
+1
+2
+3
+4
+execute stmt using @var2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where; Using buffer
+2	DEPENDENT SUBQUERY	t2	system	NULL	NULL	NULL	NULL	1	
+select * from t1;
+a
+1
+2
+3
+4
+deallocate prepare stmt;
+drop table t1, t2;
+set @var1=1;
+set @var2=2;
+CREATE TABLE t1 ( id INT(10), value INT(10) );
+CREATE TABLE t2 ( id INT(10) );
+insert into t1 values (1,10),(2,10),(3,10);
+insert into t2 values (1),(2);
+PREPARE stmt FROM 'UPDATE t1 t1 SET value = (SELECT 1 FROM t2 WHERE id = t1.id) WHERE  ?=?';
+execute stmt using @var1, @var2;
+execute stmt using @var1, @var1;
+deallocate prepare stmt;
+DROP TABLE t1,t2;
+set @var1=1;
+set @var2=2;
+CREATE TABLE t1 ( id INT(10), value INT(10) );
+CREATE TABLE t2 ( id INT(10) );
+insert into t1 values (1,10),(2,10),(3,10);
+insert into t2 values (1),(2);
+PREPARE stmt FROM 'EXPLAIN UPDATE t1 t1 SET value = (SELECT 1 FROM t2 WHERE id = t1.id) WHERE  ?=?';
+execute stmt using @var1, @var2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+execute stmt using @var1, @var1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
+deallocate prepare stmt;
+DROP TABLE t1,t2;
+CREATE TABLE t1 (c1 INT);
+INSERT INTO t1 (c1) VALUES (1), (2), (3);
+CREATE PROCEDURE p1(p1 INT)
+EXPLAIN DELETE FROM t1 LIMIT p1;
+CALL p1(0);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+CALL p1(1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+CALL p1(2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+# Clean up
+DROP TABLE t1;
+DROP PROCEDURE p1;
+set @var1=5;
+set @var2=4;
+create table t1 (a int) partition by list(a) (
+partition p0 values in (1,2),
+partition p1 values in (3,4)
+);
+create table t2 (a int);
+insert into t1 values (1),(2),(3),(4);
+insert into t2 values (4);
+PREPARE stmt FROM 'DELETE FROM t1 where a = ?';
+execute stmt using @var1;
+select * from t1;
+a
+1
+2
+3
+4
+execute stmt using @var2;
+select * from t1;
+a
+1
+2
+3
+deallocate prepare stmt;
+drop table t1, t2;
+set @var1=5;
+set @var2=4;
+create table t1 (a int) partition by list(a) (
+partition p0 values in (1,2),
+partition p1 values in (3,4)
+);
+create table t2 (a int);
+insert into t1 values (1),(2),(3),(4);
+insert into t2 values (4);
+PREPARE stmt FROM 'EXPLAIN DELETE FROM t1 where a = ?';
+execute stmt using @var1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No matching rows after partition pruning
+select * from t1;
+a
+1
+2
+3
+4
+execute stmt using @var2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+select * from t1;
+a
+1
+2
+3
+4
+deallocate prepare stmt;
+drop table t1, t2;
+set @var1=1;
+set @var2=2;
+CREATE TABLE t1 ( id INT(10), value INT(10) );
+CREATE TABLE t2 ( id INT(10) );
+insert into t1 values (1,10),(2,10),(3,10);
+insert into t2 values (1),(2);
+PREPARE stmt FROM 'DELETE FROM t1 WHERE  ?=?';
+execute stmt using @var1, @var2;
+execute stmt using @var1, @var1;
+deallocate prepare stmt;
+DROP TABLE t1,t2;
+set @var1=1;
+set @var2=2;
+CREATE TABLE t1 ( id INT(10), value INT(10) );
+CREATE TABLE t2 ( id INT(10) );
+insert into t1 values (1,10),(2,10),(3,10);
+insert into t2 values (1),(2);
+PREPARE stmt FROM 'EXPLAIN DELETE FROM t1 WHERE  ?=?';
+execute stmt using @var1, @var2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+execute stmt using @var1, @var1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	3	Deleting all rows
+deallocate prepare stmt;
+DROP TABLE t1,t2;
+#
+# MDEV-33858: Assertion `(mem_root->flags & 4) == 0' fails on 2nd execution of PS with -DWITH_PROTECT_STATEMENT_MEMROOT=ON
+#
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES (1),(2);
+PREPARE stmt FROM "UPDATE t SET a = 0 LIMIT ?";
+EXECUTE stmt USING 0;
+EXECUTE stmt USING 1;
+DROP TABLE t;
+# End of 10.5 tests
+#
 # MDEV-33769: Memory leak found in the test main.rownum run with --ps-protocol against a server built with the option -DWITH_PROTECT_STATEMENT_MEMROOT
 #
 CREATE OR REPLACE TABLE t1(a INT);
diff --git a/mysql-test/main/ps_mem_leaks.test b/mysql-test/main/ps_mem_leaks.test
index 16a46596c94..b7d560e2016 100644
--- a/mysql-test/main/ps_mem_leaks.test
+++ b/mysql-test/main/ps_mem_leaks.test
@@ -5,6 +5,7 @@
 # The cmake  option -DWITH_PROTECT_STATEMENT_MEMROOT is used only
 # for debug build
 --source include/have_debug.inc
+--source include/have_partition.inc
 
 --echo #
 --echo # MDEV-32369: Memory leak when executing PS for query with IN subquery
@@ -111,6 +112,219 @@ DROP TABLE t1;
 
 --echo # End of 10.4 tests
 
+--echo #
+--echo # MDEV-34447: Memory leakage is detected on running the test main.ps against the server 11.1
+--echo #
+CREATE TABLE t1 (id INT, value INT);
+CREATE TABLE t2 (id INT);
+
+PREPARE stmt FROM 'UPDATE t1 SET value = (SELECT 1 FROM t2 WHERE id = t1.id)';
+EXECUTE stmt;
+INSERT INTO t1 VALUES (1,10),(2,10),(3,10);
+INSERT INTO t2 VALUES (1),(2);
+EXECUTE stmt;
+SELECT * FROM t1;
+DEALLOCATE PREPARE stmt;
+DROP TABLE t1, t2;
+
+--echo # Memory leak also could take place on running the DELETE statement
+--echo # with the LIMIT clause. Check it.
+CREATE TABLE t1 (c1 INT);
+INSERT INTO t1 (c1) VALUES (1), (2), (3);
+
+CREATE PROCEDURE p1(p1 INT)
+  DELETE FROM t1 LIMIT p1;
+
+CALL p1(0);
+CALL p1(1);
+CALL p1(2);
+
+--echo # Clean up
+DROP TABLE t1;
+DROP PROCEDURE p1;
+
+--echo #
+--echo # MDEV-34757: assertion of (mem_root->flags & 4) == 0 fails in 2nd ps execution with partition pruning
+--echo #
+# same as the first MDEV-34444 testcase but with explain
+CREATE TABLE t1 (id INT, value INT);
+CREATE TABLE t2 (id INT);
+
+PREPARE stmt FROM 'EXPLAIN UPDATE t1 SET value = (SELECT 1 FROM t2 WHERE id = t1.id)';
+# we are testing 2nd ps assertion failure, not explain output, which
+# may vary from version to version
+--disable_result_log
+EXECUTE stmt;
+--enable_result_log
+INSERT INTO t1 VALUES (1,10),(2,10),(3,10);
+INSERT INTO t2 VALUES (1),(2);
+--disable_result_log
+EXECUTE stmt;
+--enable_result_log
+SELECT * FROM t1;
+DEALLOCATE PREPARE stmt;
+DROP TABLE t1, t2;
+
+# 2nd ps mem leak; partition pruning
+set @var1=5;
+set @var2=4;
+create table t1 (a int) partition by list(a) (
+  partition p0 values in (null,1,2),
+  partition p1 values in (3,4)
+);
+create table t2 (a int);
+insert into t1 values (1),(2),(3),(4);
+insert into t2 values (4);
+PREPARE stmt FROM 'UPDATE t1 t1 SET a = (SELECT 1 FROM t2 WHERE a = t1.a) where a = ?';
+execute stmt using @var1;
+select * from t1;
+execute stmt using @var2;
+select * from t1;
+deallocate prepare stmt;
+drop table t1, t2;
+
+# same but with explain
+set @var1=5;
+set @var2=4;
+create table t1 (a int) partition by list(a) (
+  partition p0 values in (null,1,2),
+  partition p1 values in (3,4)
+);
+create table t2 (a int);
+insert into t1 values (1),(2),(3),(4);
+insert into t2 values (4);
+PREPARE stmt FROM 'EXPLAIN UPDATE t1 t1 SET a = (SELECT 1 FROM t2 WHERE a = t1.a) where a = ?';
+execute stmt using @var1;
+select * from t1;
+execute stmt using @var2;
+select * from t1;
+deallocate prepare stmt;
+drop table t1, t2;
+
+# top level impossible where
+set @var1=1;
+set @var2=2;
+CREATE TABLE t1 ( id INT(10), value INT(10) );
+CREATE TABLE t2 ( id INT(10) );
+insert into t1 values (1,10),(2,10),(3,10);
+insert into t2 values (1),(2);
+
+PREPARE stmt FROM 'UPDATE t1 t1 SET value = (SELECT 1 FROM t2 WHERE id = t1.id) WHERE  ?=?';
+execute stmt using @var1, @var2;
+execute stmt using @var1, @var1;
+deallocate prepare stmt;
+DROP TABLE t1,t2;
+
+# top level impossible where, with explain
+set @var1=1;
+set @var2=2;
+CREATE TABLE t1 ( id INT(10), value INT(10) );
+CREATE TABLE t2 ( id INT(10) );
+insert into t1 values (1,10),(2,10),(3,10);
+insert into t2 values (1),(2);
+
+PREPARE stmt FROM 'EXPLAIN UPDATE t1 t1 SET value = (SELECT 1 FROM t2 WHERE id = t1.id) WHERE  ?=?';
+execute stmt using @var1, @var2;
+execute stmt using @var1, @var1;
+deallocate prepare stmt;
+DROP TABLE t1,t2;
+
+# Now we do delete instead of update
+
+# same as the second MDEV-34447 testcase but with explain
+CREATE TABLE t1 (c1 INT);
+INSERT INTO t1 (c1) VALUES (1), (2), (3);
+
+CREATE PROCEDURE p1(p1 INT)
+  EXPLAIN DELETE FROM t1 LIMIT p1;
+
+CALL p1(0);
+CALL p1(1);
+CALL p1(2);
+
+--echo # Clean up
+DROP TABLE t1;
+DROP PROCEDURE p1;
+
+# partition pruning
+set @var1=5;
+set @var2=4;
+create table t1 (a int) partition by list(a) (
+  partition p0 values in (1,2),
+  partition p1 values in (3,4)
+);
+create table t2 (a int);
+insert into t1 values (1),(2),(3),(4);
+insert into t2 values (4);
+PREPARE stmt FROM 'DELETE FROM t1 where a = ?';
+execute stmt using @var1;
+select * from t1;
+execute stmt using @var2;
+select * from t1;
+deallocate prepare stmt;
+drop table t1, t2;
+
+# same but with explain
+set @var1=5;
+set @var2=4;
+create table t1 (a int) partition by list(a) (
+  partition p0 values in (1,2),
+  partition p1 values in (3,4)
+);
+create table t2 (a int);
+insert into t1 values (1),(2),(3),(4);
+insert into t2 values (4);
+PREPARE stmt FROM 'EXPLAIN DELETE FROM t1 where a = ?';
+execute stmt using @var1;
+select * from t1;
+execute stmt using @var2;
+select * from t1;
+deallocate prepare stmt;
+drop table t1, t2;
+
+# top level impossible where
+set @var1=1;
+set @var2=2;
+CREATE TABLE t1 ( id INT(10), value INT(10) );
+CREATE TABLE t2 ( id INT(10) );
+insert into t1 values (1,10),(2,10),(3,10);
+insert into t2 values (1),(2);
+
+PREPARE stmt FROM 'DELETE FROM t1 WHERE  ?=?';
+execute stmt using @var1, @var2;
+execute stmt using @var1, @var1;
+deallocate prepare stmt;
+DROP TABLE t1,t2;
+
+# top level impossible where, with explain
+set @var1=1;
+set @var2=2;
+CREATE TABLE t1 ( id INT(10), value INT(10) );
+CREATE TABLE t2 ( id INT(10) );
+insert into t1 values (1,10),(2,10),(3,10);
+insert into t2 values (1),(2);
+
+PREPARE stmt FROM 'EXPLAIN DELETE FROM t1 WHERE  ?=?';
+execute stmt using @var1, @var2;
+execute stmt using @var1, @var1;
+deallocate prepare stmt;
+DROP TABLE t1,t2;
+
+--echo #
+--echo # MDEV-33858: Assertion `(mem_root->flags & 4) == 0' fails on 2nd execution of PS with -DWITH_PROTECT_STATEMENT_MEMROOT=ON
+--echo #
+
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES (1),(2); # Optional, fails either way
+PREPARE stmt FROM "UPDATE t SET a = 0 LIMIT ?";
+EXECUTE stmt USING 0;
+EXECUTE stmt USING 1;
+
+# CLeanup
+DROP TABLE t;
+
+--echo # End of 10.5 tests
+
 --echo #
 --echo # MDEV-33769: Memory leak found in the test main.rownum run with --ps-protocol against a server built with the option -DWITH_PROTECT_STATEMENT_MEMROOT
 --echo #
diff --git a/mysql-test/main/secondary_key_costs.result b/mysql-test/main/secondary_key_costs.result
index b246b666115..3a5b883068c 100644
--- a/mysql-test/main/secondary_key_costs.result
+++ b/mysql-test/main/secondary_key_costs.result
@@ -82,7 +82,7 @@ json_detailed(json_extract(@trace, '$**.considered_access_paths'))
 drop table t1, name, flag2;
 select @@optimizer_adjust_secondary_key_costs;
 @@optimizer_adjust_secondary_key_costs
-
+fix_reuse_range_for_ref
 set @@optimizer_adjust_secondary_key_costs=7;
 select @@optimizer_adjust_secondary_key_costs;
 @@optimizer_adjust_secondary_key_costs
diff --git a/mysql-test/main/show_check.result b/mysql-test/main/show_check.result
index 30637e12ca0..9cbf1d19716 100644
--- a/mysql-test/main/show_check.result
+++ b/mysql-test/main/show_check.result
@@ -66,7 +66,7 @@ Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is
 def	information_schema	STATISTICS	STATISTICS	TABLE_NAME	Table	253	64	2	N	4097	0	8
 def	information_schema	STATISTICS	STATISTICS	NON_UNIQUE	Non_unique	8	1	1	N	36865	0	63
 def	information_schema	STATISTICS	STATISTICS	INDEX_NAME	Key_name	253	64	7	N	4097	0	8
-def	information_schema	STATISTICS	STATISTICS	SEQ_IN_INDEX	Seq_in_index	8	2	1	N	36865	0	63
+def	information_schema	STATISTICS	STATISTICS	SEQ_IN_INDEX	Seq_in_index	3	2	1	N	36897	0	63
 def	information_schema	STATISTICS	STATISTICS	COLUMN_NAME	Column_name	253	64	1	N	4097	0	8
 def	information_schema	STATISTICS	STATISTICS	COLLATION	Collation	253	1	1	Y	4096	0	8
 def	information_schema	STATISTICS	STATISTICS	CARDINALITY	Cardinality	8	21	1	Y	36864	0	63
@@ -652,7 +652,7 @@ Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is
 def	information_schema	STATISTICS	STATISTICS	TABLE_NAME	Table	253	64	2	N	4097	0	63
 def	information_schema	STATISTICS	STATISTICS	NON_UNIQUE	Non_unique	8	1	1	N	36865	0	63
 def	information_schema	STATISTICS	STATISTICS	INDEX_NAME	Key_name	253	64	7	N	4097	0	63
-def	information_schema	STATISTICS	STATISTICS	SEQ_IN_INDEX	Seq_in_index	8	2	1	N	36865	0	63
+def	information_schema	STATISTICS	STATISTICS	SEQ_IN_INDEX	Seq_in_index	3	2	1	N	36897	0	63
 def	information_schema	STATISTICS	STATISTICS	COLUMN_NAME	Column_name	253	64	6	N	4097	0	63
 def	information_schema	STATISTICS	STATISTICS	COLLATION	Collation	253	1	1	Y	4096	0	63
 def	information_schema	STATISTICS	STATISTICS	CARDINALITY	Cardinality	8	21	1	Y	36864	0	63
@@ -923,7 +923,7 @@ Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is
 def	information_schema	STATISTICS	STATISTICS	TABLE_NAME	Table	253	192	2	N	4097	0	33
 def	information_schema	STATISTICS	STATISTICS	NON_UNIQUE	Non_unique	8	1	1	N	36865	0	63
 def	information_schema	STATISTICS	STATISTICS	INDEX_NAME	Key_name	253	192	7	N	4097	0	33
-def	information_schema	STATISTICS	STATISTICS	SEQ_IN_INDEX	Seq_in_index	8	2	1	N	36865	0	63
+def	information_schema	STATISTICS	STATISTICS	SEQ_IN_INDEX	Seq_in_index	3	2	1	N	36897	0	63
 def	information_schema	STATISTICS	STATISTICS	COLUMN_NAME	Column_name	253	192	1	N	4097	0	33
 def	information_schema	STATISTICS	STATISTICS	COLLATION	Collation	253	3	1	Y	4096	0	33
 def	information_schema	STATISTICS	STATISTICS	CARDINALITY	Cardinality	8	21	1	Y	36864	0	63
diff --git a/mysql-test/suite/funcs_1/r/is_columns_is.result b/mysql-test/suite/funcs_1/r/is_columns_is.result
index be9d2b4c8b1..f1d819fa9ef 100644
--- a/mysql-test/suite/funcs_1/r/is_columns_is.result
+++ b/mysql-test/suite/funcs_1/r/is_columns_is.result
@@ -360,7 +360,7 @@ def	information_schema	STATISTICS	INDEX_TYPE	14	NULL	NO	varchar	16	48	NULL	NULL
 def	information_schema	STATISTICS	NON_UNIQUE	4	NULL	NO	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(1)			select		NEVER	NULL
 def	information_schema	STATISTICS	NULLABLE	13	NULL	NO	varchar	3	9	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(3)			select		NEVER	NULL
 def	information_schema	STATISTICS	PACKED	12	NULL	YES	varchar	10	30	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(10)			select		NEVER	NULL
-def	information_schema	STATISTICS	SEQ_IN_INDEX	7	NULL	NO	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(2)			select		NEVER	NULL
+def	information_schema	STATISTICS	SEQ_IN_INDEX	7	NULL	NO	int	NULL	NULL	10	0	NULL	NULL	NULL	int(2) unsigned			select		NEVER	NULL
 def	information_schema	STATISTICS	SUB_PART	11	NULL	YES	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(3)			select		NEVER	NULL
 def	information_schema	STATISTICS	TABLE_CATALOG	1	NULL	NO	varchar	512	1536	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(512)			select		NEVER	NULL
 def	information_schema	STATISTICS	TABLE_NAME	3	NULL	NO	varchar	64	192	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(64)			select		NEVER	NULL
@@ -905,7 +905,7 @@ NULL	information_schema	SPATIAL_REF_SYS	AUTH_SRID	int	NULL	NULL	NULL	NULL	int(5)
 NULL	information_schema	STATISTICS	NON_UNIQUE	bigint	NULL	NULL	NULL	NULL	bigint(1)
 3.0000	information_schema	STATISTICS	INDEX_SCHEMA	varchar	64	192	utf8mb3	utf8mb3_general_ci	varchar(64)
 3.0000	information_schema	STATISTICS	INDEX_NAME	varchar	64	192	utf8mb3	utf8mb3_general_ci	varchar(64)
-NULL	information_schema	STATISTICS	SEQ_IN_INDEX	bigint	NULL	NULL	NULL	NULL	bigint(2)
+NULL	information_schema	STATISTICS	SEQ_IN_INDEX	int	NULL	NULL	NULL	NULL	int(2) unsigned
 3.0000	information_schema	STATISTICS	COLUMN_NAME	varchar	64	192	utf8mb3	utf8mb3_general_ci	varchar(64)
 3.0000	information_schema	STATISTICS	COLLATION	varchar	1	3	utf8mb3	utf8mb3_general_ci	varchar(1)
 NULL	information_schema	STATISTICS	CARDINALITY	bigint	NULL	NULL	NULL	NULL	bigint(21)
diff --git a/mysql-test/suite/funcs_1/r/is_columns_is_embedded.result b/mysql-test/suite/funcs_1/r/is_columns_is_embedded.result
index 79c43e18776..6b4aa6fcb8e 100644
--- a/mysql-test/suite/funcs_1/r/is_columns_is_embedded.result
+++ b/mysql-test/suite/funcs_1/r/is_columns_is_embedded.result
@@ -360,7 +360,7 @@ def	information_schema	STATISTICS	INDEX_TYPE	14	NULL	NO	varchar	16	48	NULL	NULL
 def	information_schema	STATISTICS	NON_UNIQUE	4	NULL	NO	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(1)					NEVER	NULL
 def	information_schema	STATISTICS	NULLABLE	13	NULL	NO	varchar	3	9	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(3)					NEVER	NULL
 def	information_schema	STATISTICS	PACKED	12	NULL	YES	varchar	10	30	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(10)					NEVER	NULL
-def	information_schema	STATISTICS	SEQ_IN_INDEX	7	NULL	NO	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(2)					NEVER	NULL
+def	information_schema	STATISTICS	SEQ_IN_INDEX	7	NULL	NO	int	NULL	NULL	10	0	NULL	NULL	NULL	int(2) unsigned					NEVER	NULL
 def	information_schema	STATISTICS	SUB_PART	11	NULL	YES	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(3)					NEVER	NULL
 def	information_schema	STATISTICS	TABLE_CATALOG	1	NULL	NO	varchar	512	1536	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(512)					NEVER	NULL
 def	information_schema	STATISTICS	TABLE_NAME	3	NULL	NO	varchar	64	192	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(64)					NEVER	NULL
@@ -905,7 +905,7 @@ NULL	information_schema	SPATIAL_REF_SYS	AUTH_SRID	int	NULL	NULL	NULL	NULL	int(5)
 NULL	information_schema	STATISTICS	NON_UNIQUE	bigint	NULL	NULL	NULL	NULL	bigint(1)
 3.0000	information_schema	STATISTICS	INDEX_SCHEMA	varchar	64	192	utf8mb3	utf8mb3_general_ci	varchar(64)
 3.0000	information_schema	STATISTICS	INDEX_NAME	varchar	64	192	utf8mb3	utf8mb3_general_ci	varchar(64)
-NULL	information_schema	STATISTICS	SEQ_IN_INDEX	bigint	NULL	NULL	NULL	NULL	bigint(2)
+NULL	information_schema	STATISTICS	SEQ_IN_INDEX	int	NULL	NULL	NULL	NULL	int(2) unsigned
 3.0000	information_schema	STATISTICS	COLUMN_NAME	varchar	64	192	utf8mb3	utf8mb3_general_ci	varchar(64)
 3.0000	information_schema	STATISTICS	COLLATION	varchar	1	3	utf8mb3	utf8mb3_general_ci	varchar(1)
 NULL	information_schema	STATISTICS	CARDINALITY	bigint	NULL	NULL	NULL	NULL	bigint(21)
diff --git a/mysql-test/suite/funcs_1/r/is_statistics.result b/mysql-test/suite/funcs_1/r/is_statistics.result
index 809c287d8d6..f271913d329 100644
--- a/mysql-test/suite/funcs_1/r/is_statistics.result
+++ b/mysql-test/suite/funcs_1/r/is_statistics.result
@@ -34,7 +34,7 @@ TABLE_NAME	varchar(64)	NO		NULL
 NON_UNIQUE	bigint(1)	NO		NULL	
 INDEX_SCHEMA	varchar(64)	NO		NULL	
 INDEX_NAME	varchar(64)	NO		NULL	
-SEQ_IN_INDEX	bigint(2)	NO		NULL	
+SEQ_IN_INDEX	int(2) unsigned	NO		NULL	
 COLUMN_NAME	varchar(64)	NO		NULL	
 COLLATION	varchar(1)	YES		NULL	
 CARDINALITY	bigint(21)	YES		NULL	
@@ -54,7 +54,7 @@ STATISTICS	CREATE TEMPORARY TABLE `STATISTICS` (
   `NON_UNIQUE` bigint(1) NOT NULL,
   `INDEX_SCHEMA` varchar(64) NOT NULL,
   `INDEX_NAME` varchar(64) NOT NULL,
-  `SEQ_IN_INDEX` bigint(2) NOT NULL,
+  `SEQ_IN_INDEX` int(2) unsigned NOT NULL,
   `COLUMN_NAME` varchar(64) NOT NULL,
   `COLLATION` varchar(1),
   `CARDINALITY` bigint(21),
@@ -74,7 +74,7 @@ TABLE_NAME	varchar(64)	NO		NULL
 NON_UNIQUE	bigint(1)	NO		NULL	
 INDEX_SCHEMA	varchar(64)	NO		NULL	
 INDEX_NAME	varchar(64)	NO		NULL	
-SEQ_IN_INDEX	bigint(2)	NO		NULL	
+SEQ_IN_INDEX	int(2) unsigned	NO		NULL	
 COLUMN_NAME	varchar(64)	NO		NULL	
 COLLATION	varchar(1)	YES		NULL	
 CARDINALITY	bigint(21)	YES		NULL	
diff --git a/mysql-test/suite/sys_vars/r/sysvars_server_embedded.result b/mysql-test/suite/sys_vars/r/sysvars_server_embedded.result
index 7a0963af685..4d665991085 100644
--- a/mysql-test/suite/sys_vars/r/sysvars_server_embedded.result
+++ b/mysql-test/suite/sys_vars/r/sysvars_server_embedded.result
@@ -2325,11 +2325,11 @@ COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	OPTIMIZER_ADJUST_SECONDARY_KEY_COSTS
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	SET
-VARIABLE_COMMENT	A bit field with the following values: adjust_secondary_key_cost = Update secondary key costs for ranges to be at least 5x of clustered primary key costs. disable_max_seek = Disable 'max_seek optimization' for secondary keys and slight adjustment of filter cost. disable_forced_index_in_group_by = Disable automatic forced index in GROUP BY. fix_innodb_cardinality = Disable doubling of the Cardinality for InnoDB secondary keys. This variable will be deleted in MariaDB 11.0 as it is not needed with the new 11.0 optimizer.
+VARIABLE_COMMENT	A bit field with the following values: adjust_secondary_key_cost = Update secondary key costs for ranges to be at least 5x of clustered primary key costs. disable_max_seek = Disable 'max_seek optimization' for secondary keys and slight adjustment of filter cost. disable_forced_index_in_group_by = Disable automatic forced index in GROUP BY. fix_innodb_cardinality = Disable doubling of the Cardinality for InnoDB secondary keys. fix_reuse_range_for_ref = Do a better job at reusing range access estimates when estimating ref access. This variable will be deleted in MariaDB 11.0 as it is not needed with the new 11.0 optimizer.
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
-ENUM_VALUE_LIST	adjust_secondary_key_cost,disable_max_seek,disable_forced_index_in_group_by,fix_innodb_cardinality
+ENUM_VALUE_LIST	adjust_secondary_key_cost,disable_max_seek,disable_forced_index_in_group_by,fix_innodb_cardinality,fix_reuse_range_for_ref
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	OPTIMIZER_EXTRA_PRUNING_DEPTH
diff --git a/mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result b/mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result
index d25980e9902..ab89741b082 100644
--- a/mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result
+++ b/mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result
@@ -2495,11 +2495,11 @@ COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	OPTIMIZER_ADJUST_SECONDARY_KEY_COSTS
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	SET
-VARIABLE_COMMENT	A bit field with the following values: adjust_secondary_key_cost = Update secondary key costs for ranges to be at least 5x of clustered primary key costs. disable_max_seek = Disable 'max_seek optimization' for secondary keys and slight adjustment of filter cost. disable_forced_index_in_group_by = Disable automatic forced index in GROUP BY. fix_innodb_cardinality = Disable doubling of the Cardinality for InnoDB secondary keys. This variable will be deleted in MariaDB 11.0 as it is not needed with the new 11.0 optimizer.
+VARIABLE_COMMENT	A bit field with the following values: adjust_secondary_key_cost = Update secondary key costs for ranges to be at least 5x of clustered primary key costs. disable_max_seek = Disable 'max_seek optimization' for secondary keys and slight adjustment of filter cost. disable_forced_index_in_group_by = Disable automatic forced index in GROUP BY. fix_innodb_cardinality = Disable doubling of the Cardinality for InnoDB secondary keys. fix_reuse_range_for_ref = Do a better job at reusing range access estimates when estimating ref access. This variable will be deleted in MariaDB 11.0 as it is not needed with the new 11.0 optimizer.
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
-ENUM_VALUE_LIST	adjust_secondary_key_cost,disable_max_seek,disable_forced_index_in_group_by,fix_innodb_cardinality
+ENUM_VALUE_LIST	adjust_secondary_key_cost,disable_max_seek,disable_forced_index_in_group_by,fix_innodb_cardinality,fix_reuse_range_for_ref
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	OPTIMIZER_EXTRA_PRUNING_DEPTH
diff --git a/mysys/crc32/crc32c.cc b/mysys/crc32/crc32c.cc
index 6de7af70db7..0d65d0027d4 100644
--- a/mysys/crc32/crc32c.cc
+++ b/mysys/crc32/crc32c.cc
@@ -455,7 +455,7 @@ static int arch_ppc_probe(void) {
 
   return arch_ppc_crc32;
 }
-# elif defined __FreeBSD_version && __FreeBSD_version >= 1200000
+# elif defined __FreeBSD__
 #  include <machine/cpu.h>
 #  include <sys/auxv.h>
 #  include <sys/elf_common.h>
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index a63d7acd6fb..902e4df0f8d 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -207,7 +207,7 @@ typedef fp_except fp_except_t;
 
 inline void setup_fpu()
 {
-#if defined(__FreeBSD__) && defined(HAVE_IEEEFP_H) && !defined(HAVE_FEDISABLEEXCEPT)
+#if defined(__FreeBSD__) && defined(HAVE_IEEEFP_H) && !defined(HAVE_FEDISABLEEXCEPT) && defined(FP_X_INV)
   /* We can't handle floating point exceptions with threads, so disable
      this on freebsd
      Don't fall for overflow, underflow,divide-by-zero or loss of precision.
@@ -220,7 +220,7 @@ inline void setup_fpu()
   fpsetmask(~(FP_X_INV |             FP_X_OFL | FP_X_UFL | FP_X_DZ |
               FP_X_IMP));
 #endif /* FP_X_DNML */
-#endif /* __FreeBSD__ && HAVE_IEEEFP_H && !HAVE_FEDISABLEEXCEPT */
+#endif /* __FreeBSD__ && HAVE_IEEEFP_H && !HAVE_FEDISABLEEXCEPT && FP_X_INV */
 
 #ifdef HAVE_FEDISABLEEXCEPT
   fedisableexcept(FE_ALL_EXCEPT);
diff --git a/sql/sql_delete.cc b/sql/sql_delete.cc
index 9bdadf10fc0..d705f6973ee 100644
--- a/sql/sql_delete.cc
+++ b/sql/sql_delete.cc
@@ -523,6 +523,12 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     if (thd->binlog_for_noop_dml(transactional_table))
       DBUG_RETURN(1);
 
+    if (!thd->lex->current_select->leaf_tables_saved)
+    {
+      thd->lex->current_select->save_leaf_tables(thd);
+      thd->lex->current_select->leaf_tables_saved= true;
+    }
+
     my_ok(thd, 0);
     DBUG_RETURN(0);
   }
@@ -558,6 +564,12 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     if (thd->binlog_for_noop_dml(transactional_table))
       DBUG_RETURN(1);
 
+    if (!thd->lex->current_select->leaf_tables_saved)
+    {
+      thd->lex->current_select->save_leaf_tables(thd);
+      thd->lex->current_select->leaf_tables_saved= true;
+    }
+
     my_ok(thd, 0);
     DBUG_RETURN(0);				// Nothing to delete
   }
@@ -937,10 +949,10 @@ cleanup:
     query_cache_invalidate3(thd, table_list, 1);
   }
 
-  if (thd->lex->current_select->first_cond_optimization)
+  if (!thd->lex->current_select->leaf_tables_saved)
   {
     thd->lex->current_select->save_leaf_tables(thd);
-    thd->lex->current_select->first_cond_optimization= 0;
+    thd->lex->current_select->leaf_tables_saved= true;
   }
 
   delete deltempfile;
diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc
index 3523e2a52c7..411ca72e673 100644
--- a/sql/sql_insert.cc
+++ b/sql/sql_insert.cc
@@ -1411,10 +1411,10 @@ values_loop_end:
       ::my_ok(thd, info.copied + info.deleted + updated, id, buff);
   }
   thd->abort_on_warning= 0;
-  if (thd->lex->current_select->first_cond_optimization)
+  if (!thd->lex->current_select->leaf_tables_saved)
   {
     thd->lex->current_select->save_leaf_tables(thd);
-    thd->lex->current_select->first_cond_optimization= 0;
+    thd->lex->current_select->leaf_tables_saved= true;
   }
 
   my_free(readbuff);
diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index 825fd18ccb8..6509d6a88b5 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -3026,6 +3026,7 @@ void st_select_lex::init_query()
   first_natural_join_processing= 1;
   first_cond_optimization= 1;
   first_rownum_optimization= true;
+  leaf_tables_saved= false;
   no_wrap_view_item= 0;
   exclude_from_table_unique_test= 0;
   in_tvc= 0;
diff --git a/sql/sql_lex.h b/sql/sql_lex.h
index c3a9bad9ea0..8099a8c40c9 100644
--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -1196,6 +1196,10 @@ public:
     can be transformed into IN-subselect defined with TVC.
   */
   List<Item_func_in> in_funcs;
+  /**
+    Flag to guard against double initialization of leaf tables list
+  */
+  bool leaf_tables_saved;
   List<TABLE_LIST> leaf_tables;
   List<TABLE_LIST> leaf_tables_exec;
   List<TABLE_LIST> leaf_tables_prep;
diff --git a/sql/sql_priv.h b/sql/sql_priv.h
index 0cd7a8ba1e0..9e47af841f9 100644
--- a/sql/sql_priv.h
+++ b/sql/sql_priv.h
@@ -279,6 +279,7 @@
 #define OPTIMIZER_ADJ_DISABLE_MAX_SEEKS (2)
 #define OPTIMIZER_ADJ_DISABLE_FORCE_INDEX_GROUP_BY (4)
 #define OPTIMIZER_FIX_INNODB_CARDINALITY (8)
+#define OPTIMIZER_ADJ_FIX_REUSE_RANGE_FOR_REF (16)
 
 /*
   Replication uses 8 bytes to store SQL_MODE in the binary log. The day you
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index b6d1c6a1482..f7bfe6d9892 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -2263,12 +2263,14 @@ JOIN::optimize_inner()
 
     add_table_function_dependencies(join_list, table_map(-1));
 
-    if (thd->is_error() || select_lex->save_leaf_tables(thd))
+    if (thd->is_error() ||
+        (!select_lex->leaf_tables_saved && select_lex->save_leaf_tables(thd)))
     {
       if (arena)
         thd->restore_active_arena(arena, &backup);
       DBUG_RETURN(1);
     }
+    select_lex->leaf_tables_saved= true;
     build_bitmap_for_nested_joins(join_list, 0);
 
     sel->prep_where= conds ? conds->copy_andor_structure(thd) : 0;
@@ -7016,12 +7018,13 @@ Item_equal::add_key_fields(JOIN *join, KEY_FIELD **key_fields,
 }
 
 
-static uint
+static inline uint
 max_part_bit(key_part_map bits)
 {
-  uint found;
-  for (found=0; bits & 1 ; found++,bits>>=1) ;
-  return found;
+  if (bits == 0)
+    return 0;
+  /* find first zero bit by reverting all bits and find first bit */
+  return my_find_first_bit(~(ulonglong) bits);
 }
 
 
@@ -8193,7 +8196,6 @@ best_access_path(JOIN      *join,
   SplM_plan_info *spl_plan= 0;
   table_map spl_pd_boundary= 0;
   Range_rowid_filter_cost_info *filter= 0;
-  const char* cause= NULL;
   enum join_type best_type= JT_UNKNOWN, type= JT_UNKNOWN;
 
   disable_jbuf= disable_jbuf || idx == join->const_tables;  
@@ -8223,6 +8225,7 @@ best_access_path(JOIN      *join,
     TABLE *table= s->table;
     double best_records= DBL_MAX;
     uint max_key_part=0;
+    const char *cause= NULL;
 
     /* Test how we can use keys */
     rec= s->records/MATCHING_ROWS_IN_OTHER_TABLE;  // Assumed records/key
@@ -8235,6 +8238,7 @@ best_access_path(JOIN      *join,
       key_part_map notnull_part=0; // key parts which won't have NULL in lookup tuple.
       table_map found_ref= 0;
       uint key= keyuse->key;
+      uint max_const_parts;
       filter= 0;
       bool ft_key=  (keyuse->keypart == FT_KEYPART);
       /* Bitmap of keyparts where the ref access is over 'keypart=const': */
@@ -8338,6 +8342,8 @@ best_access_path(JOIN      *join,
         rec= MATCHING_ROWS_IN_OTHER_TABLE;      // Fix for small tables
 
       Json_writer_object trace_access_idx(thd);
+      max_const_parts= max_part_bit(const_part);
+
       /*
         full text keys require special treatment
       */
@@ -8455,9 +8461,7 @@ best_access_path(JOIN      *join,
                 in ReuseRangeEstimateForRef-3.
               */
               if (table->opt_range_keys.is_set(key) &&
-                  (const_part &
-                   (((key_part_map)1 << table->opt_range[key].key_parts)-1)) ==
-                  (((key_part_map)1 << table->opt_range[key].key_parts)-1) &&
+                  table->opt_range[key].key_parts <= max_const_parts &&
                   table->opt_range[key].ranges == 1 &&
                   records > (double) table->opt_range[key].rows)
               {
@@ -8503,6 +8507,17 @@ best_access_path(JOIN      *join,
                found_part == PREV_BITS(uint,keyinfo->user_defined_key_parts)))
           {
             max_key_part= max_part_bit(found_part);
+            bool all_used_equalities_are_const;
+            if ((thd->variables.optimizer_adjust_secondary_key_costs &
+                OPTIMIZER_ADJ_FIX_REUSE_RANGE_FOR_REF))
+            {
+              all_used_equalities_are_const= (max_key_part == max_const_parts);
+            }
+            else
+            {
+              // Old, incorrect check:
+              all_used_equalities_are_const= !found_ref;
+            }
             /*
               ReuseRangeEstimateForRef-3:
               We're now considering a ref[or_null] access via
@@ -8517,7 +8532,7 @@ best_access_path(JOIN      *join,
               create quick select over another index), so we can't compare
               them to (**). We'll make indirect judgements instead.
               The sufficient conditions for re-use are:
-              (C1) All e_i in (**) are constants, i.e. found_ref==FALSE. (if
+              (C1) All e_i in (**) are constants (if
                    this is not satisfied we have no way to know which ranges
                    will be actually scanned by 'ref' until we execute the 
                    join)
@@ -8527,7 +8542,7 @@ best_access_path(JOIN      *join,
               We also have a property that "range optimizer produces equal or 
               tighter set of scan intervals than ref(const) optimizer". Each
               of the intervals in (**) are "tightest possible" intervals when 
-              one limits itself to using keyparts 1..K (which we do in #2).              
+              one limits itself to using keyparts 1..K (which we do in #2).
               From here it follows that range access used either one, or
               both of the (I1) and (I2) intervals:
               
@@ -8542,7 +8557,8 @@ best_access_path(JOIN      *join,
 
               (C3) "range optimizer used (have ref_or_null?2:1) intervals"
             */
-            if (table->opt_range_keys.is_set(key) && !found_ref &&      //(C1)
+            if (table->opt_range_keys.is_set(key) &&
+                all_used_equalities_are_const && // (C1)
                 table->opt_range[key].key_parts == max_key_part &&      //(C2)
                 table->opt_range[key].ranges == 1 + MY_TEST(ref_or_null_part)) //(C3)
             {
@@ -8575,10 +8591,10 @@ best_access_path(JOIN      *join,
                 */
                 if (table->opt_range_keys.is_set(key))
                 {
+                  double rows= (double) table->opt_range[key].rows;
                   if (table->opt_range[key].key_parts >= max_key_part) // (2)
                   {
-                    double rows= (double) table->opt_range[key].rows;
-                    if (!found_ref &&                                  // (1)
+                    if (all_used_equalities_are_const &&               // (1)
                         records < rows)                                // (3)
                     {
                       trace_access_idx.add("used_range_estimates", "clipped up");
@@ -8646,15 +8662,26 @@ best_access_path(JOIN      *join,
               */
               if (table->opt_range_keys.is_set(key) &&
                   table->opt_range[key].key_parts <= max_key_part &&
-                  const_part &
-                  ((key_part_map)1 << table->opt_range[key].key_parts) &&
                   table->opt_range[key].ranges == (1 +
                                                    MY_TEST(ref_or_null_part &
                                                            const_part)) &&
                   records > (double) table->opt_range[key].rows)
               {
-                trace_access_idx.add("used_range_estimates", true);
-                records= (double) table->opt_range[key].rows;
+                bool all_parts_used;
+                if ((thd->variables.optimizer_adjust_secondary_key_costs &
+                     OPTIMIZER_ADJ_FIX_REUSE_RANGE_FOR_REF))
+                {
+                  all_parts_used= table->opt_range[key].key_parts <= max_const_parts;
+                }
+                else
+                  all_parts_used= (bool) (const_part &
+                                          ((key_part_map)1
+                                           << table->opt_range[key].key_parts));
+                if (all_parts_used)
+                {
+                  trace_access_idx.add("used_range_estimates", true);
+                  records= (double) table->opt_range[key].rows;
+                }
               }
             }
 
@@ -8770,7 +8797,9 @@ best_access_path(JOIN      *join,
                                table->key_info[filter->key_no].name);
         }
       }
-      trace_access_idx.add("rows", records).add("cost", tmp);
+
+      if (!cause)
+        trace_access_idx.add("rows", records).add("cost", tmp);
 
       if (tmp + 0.0001 < best_time - records/TIME_FOR_COMPARE)
       {
@@ -8789,7 +8818,6 @@ best_access_path(JOIN      *join,
         trace_access_idx.add("chosen", false)
                         .add("cause", cause ? cause : "cost");
       }
-      cause= nullptr;
     } /* for each key */
     records= best_records;
   }
diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 1c7c58f4cd2..551435d3265 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -9601,7 +9601,7 @@ ST_FIELD_INFO stat_fields_info[]=
   Column("NON_UNIQUE",    SLonglong(1),NOT_NULL, "Non_unique",  OPEN_FRM_ONLY),
   Column("INDEX_SCHEMA",  Name(),      NOT_NULL,                OPEN_FRM_ONLY),
   Column("INDEX_NAME",    Name(),      NOT_NULL, "Key_name",    OPEN_FRM_ONLY),
-  Column("SEQ_IN_INDEX",  SLonglong(2),NOT_NULL, "Seq_in_index",OPEN_FRM_ONLY),
+  Column("SEQ_IN_INDEX",  ULong(2),    NOT_NULL, "Seq_in_index",OPEN_FRM_ONLY),
   Column("COLUMN_NAME",   Name(),      NOT_NULL, "Column_name", OPEN_FRM_ONLY),
   Column("COLLATION",     Varchar(1),  NULLABLE, "Collation",   OPEN_FULL_TABLE),
   Column("CARDINALITY",   SLonglong(), NULLABLE, "Cardinality", OPEN_FULL_TABLE),
diff --git a/sql/sql_update.cc b/sql/sql_update.cc
index 0dfcb47e310..c9e3cbca9dc 100644
--- a/sql/sql_update.cc
+++ b/sql/sql_update.cc
@@ -577,6 +577,12 @@ int mysql_update(THD *thd,
     if (thd->binlog_for_noop_dml(transactional_table))
       DBUG_RETURN(1);
 
+    if (!thd->lex->current_select->leaf_tables_saved)
+    {
+      thd->lex->current_select->save_leaf_tables(thd);
+      thd->lex->current_select->leaf_tables_saved= true;
+    }
+
     my_ok(thd);				// No matching records
     DBUG_RETURN(0);
   }
@@ -611,6 +617,12 @@ int mysql_update(THD *thd,
     if (thd->binlog_for_noop_dml(transactional_table))
       DBUG_RETURN(1);
 
+    if (!thd->lex->current_select->leaf_tables_saved)
+    {
+      thd->lex->current_select->save_leaf_tables(thd);
+      thd->lex->current_select->leaf_tables_saved= true;
+    }
+
     my_ok(thd);				// No matching records
     DBUG_RETURN(0);
   }
@@ -1385,10 +1397,10 @@ update_end:
   }
   thd->count_cuted_fields= CHECK_FIELD_IGNORE;		/* calc cuted fields */
   thd->abort_on_warning= 0;
-  if (thd->lex->current_select->first_cond_optimization)
+  if (!thd->lex->current_select->leaf_tables_saved)
   {
     thd->lex->current_select->save_leaf_tables(thd);
-    thd->lex->current_select->first_cond_optimization= 0;
+    thd->lex->current_select->leaf_tables_saved= true;
   }
   *found_return= found;
   *updated_return= updated;
diff --git a/sql/sys_vars.cc b/sql/sys_vars.cc
index 6d52dfd516a..25ee0016991 100644
--- a/sql/sys_vars.cc
+++ b/sql/sys_vars.cc
@@ -2958,7 +2958,8 @@ static Sys_var_ulong Sys_optimizer_trace_max_mem_size(
 */
 static const char *adjust_secondary_key_cost[]=
 {
-  "adjust_secondary_key_cost", "disable_max_seek", "disable_forced_index_in_group_by", "fix_innodb_cardinality",0
+  "adjust_secondary_key_cost", "disable_max_seek", "disable_forced_index_in_group_by",
+  "fix_innodb_cardinality", "fix_reuse_range_for_ref", 0
 };
 
 
@@ -2973,10 +2974,12 @@ static Sys_var_set Sys_optimizer_adjust_secondary_key_costs(
     "GROUP BY. "
     "fix_innodb_cardinality = Disable doubling of the Cardinality for InnoDB "
     "secondary keys. "
+    "fix_reuse_range_for_ref = Do a better job at reusing range access estimates "
+    "when estimating ref access. "
     "This variable will be deleted in MariaDB 11.0 as it is not needed with the "
     "new 11.0 optimizer.",
     SESSION_VAR(optimizer_adjust_secondary_key_costs), CMD_LINE(REQUIRED_ARG),
-    adjust_secondary_key_cost, DEFAULT(0));
+    adjust_secondary_key_cost, DEFAULT(OPTIMIZER_ADJ_FIX_REUSE_RANGE_FOR_REF));
 
 
 static Sys_var_charptr_fscs Sys_pid_file(
diff --git a/storage/columnstore/CMakeLists.txt b/storage/columnstore/CMakeLists.txt
index 3767d5da0f2..70a9ef3df1f 100644
--- a/storage/columnstore/CMakeLists.txt
+++ b/storage/columnstore/CMakeLists.txt
@@ -26,6 +26,7 @@ SET_PROPERTY(DIRECTORY PROPERTY INCLUDE_DIRECTORIES "${dirs}")
 IF(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR
 CMAKE_SYSTEM_PROCESSOR STREQUAL "amd64" OR
 CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
+    SET(PCRE_INCLUDES "${PCRE_INCLUDE_DIRS}")
     add_subdirectory(columnstore)
 
     IF(TARGET columnstore)
diff --git a/unittest/sql/my_apc-t.cc b/unittest/sql/my_apc-t.cc
index e3f8293ffcb..83f894bedc5 100644
--- a/unittest/sql/my_apc-t.cc
+++ b/unittest/sql/my_apc-t.cc
@@ -190,6 +190,7 @@ int main(int args, char **argv)
   pthread_t request_thr[N_THREADS];
   int i;
 
+  my_mutex_init();
   my_thread_global_init();
 
   mysql_mutex_init(0, &apc_counters_mutex, MY_MUTEX_INIT_FAST);