Added server variable compression_default, which if 1/ON sets compression on...

Added server variable compression_default, which if 1/ON sets compression on for all new InnoDB/XtraDB tables by default by setting PAGE_COMPRESSED=1

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

@@ -123,5 +123,31 @@ drop procedure innodb_insert_proc;
 drop table innodb_normal;
 drop table innodb_compact;
 drop table innodb_dynamic;
+CREATE TABLE no_compression (id INT NOT NULL, name VARCHAR(200)) ENGINE=InnoDB;
+SET SESSION innodb_compression_default = 1;
+CREATE TABLE default_compression (id INT NOT NULL, name VARCHAR(200)) ENGINE=InnoDB;
+CREATE TABLE explicit_no_compression (id INT NOT NULL, name VARCHAR(200)) ENGINE=InnoDB PAGE_COMPRESSED=0;
+SHOW CREATE TABLE no_compression;
+Table	Create Table
+no_compression	CREATE TABLE `no_compression` (
+  `id` int(11) NOT NULL,
+  `name` varchar(200) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+SHOW CREATE TABLE default_compression;
+Table	Create Table
+default_compression	CREATE TABLE `default_compression` (
+  `id` int(11) NOT NULL,
+  `name` varchar(200) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 `PAGE_COMPRESSED`='ON'
+SHOW CREATE TABLE explicit_no_compression;
+Table	Create Table
+explicit_no_compression	CREATE TABLE `explicit_no_compression` (
+  `id` int(11) NOT NULL,
+  `name` varchar(200) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 `PAGE_COMPRESSED`=0
+DROP TABLE no_compression;
+DROP TABLE default_compression;
+DROP TABLE explicit_no_compression;
+SET SESSION innodb_compression_default = 0;
 Warnings:
 Warning	131	Using innodb_file_format is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html

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

@@ -95,6 +95,20 @@ drop table innodb_normal;
 drop table innodb_compact;
 drop table innodb_dynamic;
 
+# MDEV-9820 introducing variable for having page compression turned on by default on InnoDB tables
+# test that innodb_compression_default works as expected, i.e. if it has a value of 1 (ON) tables are by default created with page_compressed=1;
+CREATE TABLE no_compression (id INT NOT NULL, name VARCHAR(200)) ENGINE=InnoDB;
+SET SESSION innodb_compression_default = 1;
+CREATE TABLE default_compression (id INT NOT NULL, name VARCHAR(200)) ENGINE=InnoDB;
+CREATE TABLE explicit_no_compression (id INT NOT NULL, name VARCHAR(200)) ENGINE=InnoDB PAGE_COMPRESSED=0;
+SHOW CREATE TABLE no_compression;
+SHOW CREATE TABLE default_compression;
+SHOW CREATE TABLE explicit_no_compression;
+DROP TABLE no_compression;
+DROP TABLE default_compression;
+DROP TABLE explicit_no_compression;
+SET SESSION innodb_compression_default = 0;
+
 # reset system
 --disable_query_log
 EVAL SET GLOBAL innodb_compression_algorithm = $innodb_compression_algorithm_orig;

storage/innobase/handler/ha_innodb.cc

@@ -684,6 +684,11 @@ srv_mbr_debug(const byte* data)
 static void innodb_remember_check_sysvar_funcs();
 mysql_var_check_func check_sysvar_enum;
 
+// should page compression be used by default for new tables
+static MYSQL_THDVAR_BOOL(compression_default, PLUGIN_VAR_OPCMDARG,
+  "Is compression the default for new tables", 
+  NULL, NULL, FALSE);
+
 static MYSQL_THDVAR_UINT(default_encryption_key_id, PLUGIN_VAR_RQCMDARG,
 			 "Default encryption key id used for table encryption.",
 			 NULL, NULL,
@@ -701,7 +706,7 @@ ha_create_table_option innodb_table_option_list[]=
 {
   /* With this option user can enable page compression feature for the
   table */
-  HA_TOPTION_BOOL("PAGE_COMPRESSED", page_compressed, 0),
+  HA_TOPTION_SYSVAR("PAGE_COMPRESSED", page_compressed, compression_default),
   /* With this option user can set zip compression level for page
   compression for this table*/
   HA_TOPTION_NUMBER("PAGE_COMPRESSION_LEVEL", page_compression_level, 0, 1, 9, 1),
@@ -23810,6 +23815,7 @@ static struct st_mysql_sys_var* innobase_system_variables[]= {
   MYSQL_SYSVAR(fatal_semaphore_wait_threshold),
   /* Table page compression feature */
   MYSQL_SYSVAR(use_trim),
+  MYSQL_SYSVAR(compression_default),
   MYSQL_SYSVAR(compression_algorithm),
   MYSQL_SYSVAR(mtflush_threads),
   MYSQL_SYSVAR(use_mtflush),

storage/xtradb/handler/ha_innodb.cc

@@ -620,6 +620,11 @@ ib_cb_t innodb_api_cb[] = {
 static void innodb_remember_check_sysvar_funcs();
 mysql_var_check_func check_sysvar_enum;
 
+// should page compression be used by default for new tables
+static MYSQL_THDVAR_BOOL(compression_default, PLUGIN_VAR_OPCMDARG,
+  "Is compression the default for new tables", 
+  NULL, NULL, FALSE);
+
 static MYSQL_THDVAR_UINT(default_encryption_key_id, PLUGIN_VAR_RQCMDARG,
 			 "Default encryption key id used for table encryption.",
 			 NULL, NULL,
@@ -637,7 +642,7 @@ ha_create_table_option innodb_table_option_list[]=
 {
   /* With this option user can enable page compression feature for the
   table */
-  HA_TOPTION_BOOL("PAGE_COMPRESSED", page_compressed, 0),
+  HA_TOPTION_BOOL("PAGE_COMPRESSED", page_compressed, compression_default),
   /* With this option user can set zip compression level for page
   compression for this table*/
   HA_TOPTION_NUMBER("PAGE_COMPRESSION_LEVEL", page_compression_level, 0, 1, 9, 1),
@@ -21433,6 +21438,7 @@ static struct st_mysql_sys_var* innobase_system_variables[]= {
   MYSQL_SYSVAR(fatal_semaphore_wait_threshold),
   /* Table page compression feature */
   MYSQL_SYSVAR(use_trim),
+  MYSQL_SYSVAR(compression_default),
   MYSQL_SYSVAR(compression_algorithm),
   MYSQL_SYSVAR(mtflush_threads),
   MYSQL_SYSVAR(use_mtflush),