MDEV-11984 Avoid accessing SYS_TABLESPACES unnecessarily

The following INFORMATION_SCHEMA views were unnecessarily retrieving
the data from the SYS_TABLESPACES table instead of directly fetching
it from the fil_system cache:

information_schema.innodb_tablespaces_encryption
information_schema.innodb_tablespaces_scrubbing

InnoDB always loads all tablespace metadata into memory at startup
and never evicts it while the tablespace exists.

With this fix, accessing these views will be much faster and use less
memory, and include data about all tablespaces, including undo
tablespaces.

The view information_schema.innodb_sys_tablespaces will still reflect
the contents of the SYS_TABLESPACES table.

mysql-test/suite/encryption/r/encrypt_and_grep.result

@@ -14,11 +14,11 @@ NAME
 test/t3
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 NAME
-mysql/innodb_table_stats
+innodb_system
 mysql/innodb_index_stats
+mysql/innodb_table_stats
 test/t1
 test/t2
-innodb_system
 # t1 yes on expecting NOT FOUND
 NOT FOUND /foobarsecret/ in t1.ibd
 # t2 ... on expecting NOT FOUND
@@ -32,11 +32,11 @@ SET GLOBAL innodb_encrypt_tables = off;
 # 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;
 NAME
-mysql/innodb_table_stats
+innodb_system
 mysql/innodb_index_stats
+mysql/innodb_table_stats
 test/t2
 test/t3
-innodb_system
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 NAME
 test/t1
@@ -56,11 +56,11 @@ NAME
 test/t3
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 NAME
-mysql/innodb_table_stats
+innodb_system
 mysql/innodb_index_stats
+mysql/innodb_table_stats
 test/t1
 test/t2
-innodb_system
 # t1 yes on expecting NOT FOUND
 NOT FOUND /foobarsecret/ in t1.ibd
 # t2 ... on expecting NOT FOUND

mysql-test/suite/encryption/r/innodb-spatial-index.result

@@ -36,11 +36,11 @@ INSERT INTO t2 values(1, 'secret', ST_GeomFromText('POINT(903994614 180726515)')
 # Success!
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION > 0;
 NAME
-mysql/innodb_table_stats
+innodb_system
 mysql/innodb_index_stats
+mysql/innodb_table_stats
 test/t1
 test/t2
-innodb_system
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
 NAME
 DROP TABLE t1, t2;

mysql-test/suite/encryption/r/innodb_encryption.result

@@ -8,23 +8,23 @@ innodb_encryption_rotation_iops	100
 innodb_encryption_threads	4
 SET GLOBAL innodb_encrypt_tables = ON;
 # Wait max 10 min for key encryption threads to encrypt all spaces
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+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';
 NAME
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+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';
 NAME
-mysql/innodb_table_stats
-mysql/innodb_index_stats
 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
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+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';
 NAME
-mysql/innodb_table_stats
-mysql/innodb_index_stats
 innodb_system
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+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';
 NAME
 # Success!
 # Shutdown innodb_encryption_threads
@@ -33,23 +33,23 @@ SET GLOBAL innodb_encryption_threads=0;
 # since threads are off tables should remain unencrypted
 SET GLOBAL innodb_encrypt_tables = on;
 # Wait 15s to check that nothing gets encrypted
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+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';
 NAME
-mysql/innodb_table_stats
-mysql/innodb_index_stats
 innodb_system
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+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';
 NAME
 # Success!
 # Startup innodb_encryption_threads
 SET GLOBAL innodb_encryption_threads=@start_global_value;
 # Wait max 10 min for key encryption threads to encrypt all spaces
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+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';
 NAME
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+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';
 NAME
-mysql/innodb_table_stats
-mysql/innodb_index_stats
 innodb_system
 # Success!
 # Restart mysqld --innodb_encrypt_tables=0 --innodb_encryption_threads=0
@@ -60,10 +60,10 @@ innodb_encrypt_tables	OFF
 innodb_encryption_rotate_key_age	15
 innodb_encryption_rotation_iops	100
 innodb_encryption_threads	0
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+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';
 NAME
-mysql/innodb_table_stats
-mysql/innodb_index_stats
 innodb_system
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+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';
 NAME

mysql-test/suite/encryption/t/encrypt_and_grep.test

@@ -33,7 +33,9 @@ insert t3 values (repeat('dummysecret', 12));
 --let $wait_condition=SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0
 --source include/wait_condition.inc
 
+--sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+--sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 
 --source include/shutdown_mysqld.inc
@@ -67,7 +69,9 @@ SET GLOBAL innodb_encrypt_tables = off;
 --let $wait_condition=SELECT COUNT(*) = $tables_count FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0 AND CURRENT_KEY_VERSION = 0;
 --source include/wait_condition.inc
 
+--sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+--sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 
 --source include/shutdown_mysqld.inc
@@ -100,7 +104,9 @@ SET GLOBAL innodb_encrypt_tables = on;
 --let $wait_condition=SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
 --source include/wait_condition.inc
 
+--sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+--sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 
 --source include/shutdown_mysqld.inc

mysql-test/suite/encryption/t/innodb-spatial-index.test

@@ -69,7 +69,9 @@ INSERT INTO t2 values(1, 'secret', ST_GeomFromText('POINT(903994614 180726515)')
 
 --echo # Success!
 
+--sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION > 0;
+--sorted_result
 SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
 
 DROP TABLE t1, t2;

mysql-test/suite/encryption/t/innodb_encryption.test

@@ -21,8 +21,12 @@ SET GLOBAL innodb_encrypt_tables = ON;
 --let $wait_condition=SELECT COUNT(*) >= $tables_count FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 --source include/wait_condition.inc
 
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+--sorted_result
+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';
+--sorted_result
+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';
 
 --echo # Success!
 
@@ -34,8 +38,12 @@ SET GLOBAL innodb_encrypt_tables = off;
 --let $wait_condition=SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 --source include/wait_condition.inc
 
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+--sorted_result
+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';
+--sorted_result
+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';
 
 --echo # Success!
 
@@ -51,8 +59,12 @@ SET GLOBAL innodb_encrypt_tables = on;
 --let $wait_condition=SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 --source include/wait_condition.inc
 
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+--sorted_result
+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';
+--sorted_result
+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';
 
 --echo # Success!
 
@@ -64,8 +76,12 @@ SET GLOBAL innodb_encryption_threads=@start_global_value;
 --let $wait_condition=SELECT COUNT(*) >= $tables_count FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
 --source include/wait_condition.inc
 
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
+--sorted_result
+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';
+--sorted_result
+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';
 
 --echo # Success!
 --echo # Restart mysqld --innodb_encrypt_tables=0 --innodb_encryption_threads=0
@@ -74,5 +90,9 @@ SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_
 
 SHOW VARIABLES LIKE 'innodb_encrypt%';
 
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0;
-SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION = 0;
+--sorted_result
+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';
+--sorted_result
+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';