Merge 10.5 into 10.6

mysql-test/suite/innodb/r/doublewrite.result

@@ -14,6 +14,9 @@ innodb_fil_make_page_dirty_debug	0
 show variables like 'innodb_saved_page_number_debug';
 Variable_name	Value
 innodb_saved_page_number_debug	0
+connect  stop_purge,localhost,root,,;
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+connection default;
 create table t1 (f1 int primary key, f2 blob) engine=innodb;
 start transaction;
 insert into t1 values(1, repeat('#',12));
@@ -29,17 +32,17 @@ select space from information_schema.innodb_sys_tables
 where name = 'test/t1' into @space_id;
 Warnings:
 Warning	1287	'<select expression> INTO <destination>;' is deprecated and will be removed in a future release. Please use 'SELECT <select list> INTO <destination> FROM...' instead
-# Ensure that dirty pages of table t1 is flushed.
-flush tables t1 for export;
-unlock tables;
 begin;
 insert into t1 values (6, repeat('%', 12));
+# Ensure that dirty pages of table t1 are flushed.
+set global innodb_buf_flush_list_now = 1;
 # Make the first page dirty for table t1
 set global innodb_saved_page_number_debug = 0;
 set global innodb_fil_make_page_dirty_debug = @space_id;
 # Ensure that dirty pages of table t1 are flushed.
 set global innodb_buf_flush_list_now = 1;
 # Kill the server
+disconnect stop_purge;
 # Make the first page (page_no=0) of the user tablespace
 # full of zeroes.
 #

mysql-test/suite/innodb/t/doublewrite.test

@@ -34,6 +34,10 @@ show variables like 'innodb_doublewrite';
 show variables like 'innodb_fil_make_page_dirty_debug';
 show variables like 'innodb_saved_page_number_debug';
 
+connect (stop_purge,localhost,root,,);
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+connection default;
+
 create table t1 (f1 int primary key, f2 blob) engine=innodb;
 
 start transaction;
@@ -51,12 +55,10 @@ commit work;
 select space from information_schema.innodb_sys_tables
 where name = 'test/t1' into @space_id;
 
---echo # Ensure that dirty pages of table t1 is flushed.
-flush tables t1 for export;
-unlock tables;
-
 begin;
 insert into t1 values (6, repeat('%', 12));
+--echo # Ensure that dirty pages of table t1 are flushed.
+set global innodb_buf_flush_list_now = 1;
 
 --source ../include/no_checkpoint_start.inc
 
@@ -69,6 +71,7 @@ set global innodb_buf_flush_list_now = 1;
 
 --let CLEANUP_IF_CHECKPOINT=drop table t1;
 --source ../include/no_checkpoint_end.inc
+disconnect stop_purge;
 
 --echo # Make the first page (page_no=0) of the user tablespace
 --echo # full of zeroes.

sql/table.cc

@@ -280,7 +280,8 @@ TABLE_CATEGORY get_table_category(const LEX_CSTRING *db,
   DBUG_ASSERT(name != NULL);
 
 #ifdef WITH_WSREP
-  if (my_strcasecmp(system_charset_info, db->str, "mysql") == 0 &&
+  if (db->str &&
+      my_strcasecmp(system_charset_info, db->str, "mysql") == 0 &&
       my_strcasecmp(system_charset_info, name->str, "wsrep_streaming_log") == 0)
   {
     return TABLE_CATEGORY_INFORMATION;