MDEV-21537 InnoDB INFORMATION_SCHEMA tables fail to define DEFAULT for ENUM NOT NULL

- Adding a way to define I_S columns without DEFAULT.
- Fixing all ENUM columns in I_S.INNODB* table definitions to have no DEFAULT.

mysql-test/suite/innodb/disabled.def

@@ -12,4 +12,3 @@
 
 create-index-debug : MDEV-13680 InnoDB may crash when btr_page_alloc() fails
 innodb_wl6326 : MDEV-21535 Too broad ha_innobase::records_in_range()
-innodb_wl6326_big : MDEV-21537 invalid DEFAULT for ENUM NOT NULL column

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

@@ -38,7 +38,7 @@ trx_lock_memory_bytes	bigint(21) unsigned	NO		0
 trx_rows_locked	bigint(21) unsigned	NO		0	
 trx_rows_modified	bigint(21) unsigned	NO		0	
 trx_concurrency_tickets	bigint(21) unsigned	NO		0	
-trx_isolation_level	enum('READ UNCOMMITTED','READ COMMITTED','REPEATABLE READ','SERIALIZABLE')	NO			
+trx_isolation_level	enum('READ UNCOMMITTED','READ COMMITTED','REPEATABLE READ','SERIALIZABLE')	NO		NULL	
 trx_unique_checks	int(1)	NO		0	
 trx_foreign_key_checks	int(1)	NO		0	
 trx_last_foreign_key_error	varchar(256)	YES		NULL	

mysql-test/suite/innodb/r/innodb_wl6326_big.result

@@ -229,7 +229,7 @@ INSERT INTO my_metrics
 SELECT NAME, COUNT, MAX_COUNT, MIN_COUNT, AVG_COUNT,
 COUNT_RESET, MAX_COUNT_RESET, MIN_COUNT_RESET, AVG_COUNT_RESET,
 TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET,
-STATUS, 'before'
+ENABLED, 'before'
 FROM information_schema.innodb_metrics
 WHERE NAME LIKE 'innodb_rwlock_sx_%';
 # TC-01 There are exact three entries "innodb_rwlock_sx_%" with the
@@ -254,7 +254,7 @@ INSERT INTO my_metrics
 SELECT NAME, COUNT, MAX_COUNT, MIN_COUNT, AVG_COUNT,
 COUNT_RESET, MAX_COUNT_RESET, MIN_COUNT_RESET, AVG_COUNT_RESET,
 TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET,
-STATUS, 'before'
+ENABLED, 'before'
 FROM information_schema.innodb_metrics
 WHERE NAME LIKE 'innodb_rwlock_sx_%';
 SET @extra_string = '__0_';
@@ -369,7 +369,7 @@ INSERT INTO my_metrics
 SELECT NAME, COUNT, MAX_COUNT, MIN_COUNT, AVG_COUNT,
 COUNT_RESET, MAX_COUNT_RESET, MIN_COUNT_RESET, AVG_COUNT_RESET,
 TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET,
-STATUS, 'after'
+ENABLED, 'after'
 FROM information_schema.innodb_metrics
 WHERE NAME LIKE 'innodb_rwlock_sx_%';
 # TC-16 The following activities happend after reset in innodb_metrics
@@ -389,7 +389,7 @@ INSERT INTO my_metrics
 SELECT NAME, COUNT, MAX_COUNT, MIN_COUNT, AVG_COUNT,
 COUNT_RESET, MAX_COUNT_RESET, MIN_COUNT_RESET, AVG_COUNT_RESET,
 TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET,
-STATUS, 'before'
+ENABLED, 'before'
 FROM information_schema.innodb_metrics
 WHERE NAME LIKE 'innodb_rwlock_sx_%';
 SET GLOBAL innodb_monitor_reset = "innodb_rwlock_sx_%";
@@ -397,7 +397,7 @@ INSERT INTO my_metrics
 SELECT NAME, COUNT, MAX_COUNT, MIN_COUNT, AVG_COUNT,
 COUNT_RESET, MAX_COUNT_RESET, MIN_COUNT_RESET, AVG_COUNT_RESET,
 TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET,
-STATUS, 'after'
+ENABLED, 'after'
 FROM information_schema.innodb_metrics
 WHERE NAME LIKE 'innodb_rwlock_sx_%';
 # TC-08 There was a reset. COUNT_RESET = MAX_COUNT_RESET for ALL

mysql-test/suite/innodb/t/innodb_wl6326_big.test

@@ -163,19 +163,19 @@ let $before_my_metrics= INSERT INTO my_metrics
 SELECT NAME, COUNT, MAX_COUNT, MIN_COUNT, AVG_COUNT,
 COUNT_RESET, MAX_COUNT_RESET, MIN_COUNT_RESET, AVG_COUNT_RESET,
 TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET,
-STATUS, 'before'
+ENABLED, 'before'
 FROM information_schema.innodb_metrics
 WHERE NAME LIKE 'innodb_rwlock_sx_%';
 let $after_my_metrics= INSERT INTO my_metrics
 SELECT NAME, COUNT, MAX_COUNT, MIN_COUNT, AVG_COUNT,
 COUNT_RESET, MAX_COUNT_RESET, MIN_COUNT_RESET, AVG_COUNT_RESET,
 TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET,
-STATUS, 'after'
+ENABLED, 'after'
 FROM information_schema.innodb_metrics
 WHERE NAME LIKE 'innodb_rwlock_sx_%';
 let $print_metrics= SELECT NAME, COUNT, MAX_COUNT, MIN_COUNT, AVG_COUNT,
 COUNT_RESET, MAX_COUNT_RESET, MIN_COUNT_RESET, AVG_COUNT_RESET,
-TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET, STATUS
+TIME_ENABLED, TIME_DISABLED, TIME_ELAPSED, TIME_RESET, ENABLED
 FROM information_schema.innodb_metrics
 WHERE NAME LIKE 'innodb_rwlock_sx_%'
 ORDER BY NAME;
@@ -315,12 +315,12 @@ SELECT COUNT(*) INTO @sx_count FROM my_metrics;
 --echo # TC-02 Counting is now enabled. ALL = @sx_count entries show that.
 let $check_statement=
 SELECT COUNT(*) <> @sx_count FROM my_metrics
-WHERE STATUS = 'enabled';
+WHERE ENABLED;
 if(`$check_statement`)
 {
    --echo #    fail
    eval $check_statement;
-   SELECT NAME, STATUS FROM my_metrics
+   SELECT NAME, ENABLED FROM my_metrics
    ORDER BY NAME;
    exit;
 }

mysql-test/suite/innodb_i_s/innodb_buffer_page.result

@@ -17,8 +17,12 @@ INNODB_BUFFER_PAGE	CREATE TEMPORARY TABLE `INNODB_BUFFER_PAGE` (
   `NUMBER_RECORDS` bigint(21) unsigned NOT NULL DEFAULT 0,
   `DATA_SIZE` bigint(21) unsigned NOT NULL DEFAULT 0,
   `COMPRESSED_SIZE` bigint(21) unsigned NOT NULL DEFAULT 0,
-  `PAGE_STATE` enum('NOT_USED','READY_FOR_USE','FILE_PAGE','MEMORY','REMOVE_HASH') NOT NULL DEFAULT '',
+  `PAGE_STATE` enum('NOT_USED','READY_FOR_USE','FILE_PAGE','MEMORY','REMOVE_HASH') NOT NULL,
-  `IO_FIX` enum('IO_NONE','IO_READ','IO_WRITE','IO_PIN') NOT NULL DEFAULT '',
+  `IO_FIX` enum('IO_NONE','IO_READ','IO_WRITE','IO_PIN') NOT NULL,
   `IS_OLD` int(1) NOT NULL DEFAULT 0,
   `FREE_PAGE_CLOCK` bigint(21) unsigned NOT NULL DEFAULT 0
 ) ENGINE=MEMORY DEFAULT CHARSET=utf8
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_BUFFER_PAGE;
+DROP TEMPORARY TABLE t1;
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_buffer_page.test

@@ -1,3 +1,9 @@
 --source include/have_innodb.inc
 
 SHOW CREATE TABLE INFORMATION_SCHEMA.INNODB_BUFFER_PAGE;
+
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_BUFFER_PAGE;
+DROP TEMPORARY TABLE t1;
+
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_buffer_page_lru.result

@@ -18,7 +18,11 @@ INNODB_BUFFER_PAGE_LRU	CREATE TEMPORARY TABLE `INNODB_BUFFER_PAGE_LRU` (
   `DATA_SIZE` bigint(21) unsigned NOT NULL DEFAULT 0,
   `COMPRESSED_SIZE` bigint(21) unsigned NOT NULL DEFAULT 0,
   `COMPRESSED` int(1) NOT NULL DEFAULT 0,
-  `IO_FIX` enum('IO_NONE','IO_READ','IO_WRITE','IO_PIN') NOT NULL DEFAULT '',
+  `IO_FIX` enum('IO_NONE','IO_READ','IO_WRITE','IO_PIN') NOT NULL,
   `IS_OLD` int(1) DEFAULT NULL,
   `FREE_PAGE_CLOCK` bigint(21) unsigned NOT NULL DEFAULT 0
 ) ENGINE=MEMORY DEFAULT CHARSET=utf8
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_BUFFER_PAGE_LRU;
+DROP TEMPORARY TABLE t1;
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE_LRU LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_buffer_page_lru.test

@@ -1,3 +1,9 @@
 --source include/have_innodb.inc
 
 SHOW CREATE TABLE INFORMATION_SCHEMA.INNODB_BUFFER_PAGE_LRU;
+
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_BUFFER_PAGE_LRU;
+DROP TEMPORARY TABLE t1;
+
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE_LRU LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_locks.result

@@ -3,8 +3,8 @@ Table	Create Table
 INNODB_LOCKS	CREATE TEMPORARY TABLE `INNODB_LOCKS` (
   `lock_id` varchar(81) NOT NULL DEFAULT '',
   `lock_trx_id` bigint(21) unsigned NOT NULL DEFAULT 0,
-  `lock_mode` enum('S','S,GAP','X','X,GAP','IS','IS,GAP','IX','IX,GAP','AUTO_INC') NOT NULL DEFAULT '',
+  `lock_mode` enum('S','S,GAP','X','X,GAP','IS','IS,GAP','IX','IX,GAP','AUTO_INC') NOT NULL,
-  `lock_type` enum('RECORD','TABLE') NOT NULL DEFAULT '',
+  `lock_type` enum('RECORD','TABLE') NOT NULL,
   `lock_table` varchar(1024) NOT NULL DEFAULT '',
   `lock_index` varchar(1024) DEFAULT NULL,
   `lock_space` int(11) unsigned DEFAULT NULL,
@@ -12,3 +12,7 @@ INNODB_LOCKS	CREATE TEMPORARY TABLE `INNODB_LOCKS` (
   `lock_rec` int(11) unsigned DEFAULT NULL,
   `lock_data` varchar(8192) DEFAULT NULL
 ) ENGINE=MEMORY DEFAULT CHARSET=utf8
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_LOCKS;
+DROP TEMPORARY TABLE t1;
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCKS LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_locks.test

@@ -1,3 +1,9 @@
 --source include/have_innodb.inc
 
 SHOW CREATE TABLE INFORMATION_SCHEMA.INNODB_LOCKS;
+
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_LOCKS;
+DROP TEMPORARY TABLE t1;
+
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCKS LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_metrics.result

@@ -16,6 +16,10 @@ INNODB_METRICS	CREATE TEMPORARY TABLE `INNODB_METRICS` (
   `TIME_ELAPSED` bigint(21) DEFAULT NULL,
   `TIME_RESET` datetime DEFAULT NULL,
   `ENABLED` int(1) NOT NULL DEFAULT 0,
-  `TYPE` enum('value','status_counter','set_owner','set_member','counter') NOT NULL DEFAULT '',
+  `TYPE` enum('value','status_counter','set_owner','set_member','counter') NOT NULL,
   `COMMENT` varchar(193) NOT NULL DEFAULT ''
 ) ENGINE=MEMORY DEFAULT CHARSET=utf8
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_METRICS;
+DROP TEMPORARY TABLE t1;
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_metrics.test

@@ -1,3 +1,9 @@
 --source include/have_innodb.inc
 
 SHOW CREATE TABLE INFORMATION_SCHEMA.INNODB_METRICS;
+
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_METRICS;
+DROP TEMPORARY TABLE t1;
+
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_trx.result

@@ -17,10 +17,14 @@ INNODB_TRX	CREATE TEMPORARY TABLE `INNODB_TRX` (
   `trx_rows_locked` bigint(21) unsigned NOT NULL DEFAULT 0,
   `trx_rows_modified` bigint(21) unsigned NOT NULL DEFAULT 0,
   `trx_concurrency_tickets` bigint(21) unsigned NOT NULL DEFAULT 0,
-  `trx_isolation_level` enum('READ UNCOMMITTED','READ COMMITTED','REPEATABLE READ','SERIALIZABLE') NOT NULL DEFAULT '',
+  `trx_isolation_level` enum('READ UNCOMMITTED','READ COMMITTED','REPEATABLE READ','SERIALIZABLE') NOT NULL,
   `trx_unique_checks` int(1) NOT NULL DEFAULT 0,
   `trx_foreign_key_checks` int(1) NOT NULL DEFAULT 0,
   `trx_last_foreign_key_error` varchar(256) DEFAULT NULL,
   `trx_is_read_only` int(1) NOT NULL DEFAULT 0,
   `trx_autocommit_non_locking` int(1) NOT NULL DEFAULT 0
 ) ENGINE=MEMORY DEFAULT CHARSET=utf8
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_TRX;
+DROP TEMPORARY TABLE t1;
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_TRX LIMIT 0;
+DROP TEMPORARY TABLE t1;

mysql-test/suite/innodb_i_s/innodb_trx.test

@@ -1,3 +1,9 @@
 --source include/have_innodb.inc
 
 SHOW CREATE TABLE INFORMATION_SCHEMA.INNODB_TRX;
+
+CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_TRX;
+DROP TEMPORARY TABLE t1;
+
+CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_TRX LIMIT 0;
+DROP TEMPORARY TABLE t1;

sql/sql_i_s.h

@@ -45,6 +45,13 @@ enum enum_show_open_table
 };
 
 
+enum enum_show_default
+{
+  DEFAULT_TYPE_IMPLICIT= 0,
+  DEFAULT_NONE
+};
+
+
 namespace Show {
 class Type
 {
@@ -88,21 +95,30 @@ class ST_FIELD_INFO: public Show::Type
 protected:
   LEX_CSTRING m_name;                 // I_S column name
   enum_nullability m_nullability;     // NULLABLE or NOT NULL
+  enum_show_default m_def;            // Whether has a DEFAULT value
   LEX_CSTRING m_old_name;             // SHOW column name
   enum_show_open_table m_open_method;
 public:
   ST_FIELD_INFO(const LEX_CSTRING &name, const Type &type,
                 enum_nullability nullability,
+                enum_show_default def,
                 LEX_CSTRING &old_name,
                 enum_show_open_table open_method)
-   :Type(type), m_name(name), m_nullability(nullability), m_old_name(old_name),
+   :Type(type), m_name(name),
+    m_nullability(nullability),
+    m_def(def),
+    m_old_name(old_name),
     m_open_method(open_method)
   { }
   ST_FIELD_INFO(const char *name, const Type &type,
                 enum_nullability nullability,
+                enum_show_default def,
                 const char *old_name,
                 enum_show_open_table open_method)
-   :Type(type), m_nullability(nullability), m_open_method(open_method)
+   :Type(type),
+    m_nullability(nullability),
+    m_def(def),
+    m_open_method(open_method)
   {
     m_name.str= name;
     m_name.length= safe_strlen(name);
@@ -111,6 +127,7 @@ public:
   }
   const LEX_CSTRING &name() const { return m_name; }
   bool nullable() const { return m_nullability == NULLABLE; }
+  enum_show_default def() const { return m_def; }
   const LEX_CSTRING &old_name() const { return m_old_name; }
   enum_show_open_table open_method() const { return  m_open_method; }
   bool end_marker() const { return m_name.str == NULL; }
@@ -279,14 +296,30 @@ public:
 class Column: public ST_FIELD_INFO
 {
 public:
-  Column(const char *name, const Type &type, enum_nullability nullability,
+  Column(const char *name, const Type &type,
+         enum_nullability nullability,
+         enum_show_default def,
          const char *old_name,
          enum_show_open_table open_method= SKIP_OPEN_TABLE)
-   :ST_FIELD_INFO(name, type, nullability, old_name, open_method)
+   :ST_FIELD_INFO(name, type, nullability, def, old_name, open_method)
   { }
   Column(const char *name, const Type &type, enum_nullability nullability,
+         enum_show_default def,
          enum_show_open_table open_method= SKIP_OPEN_TABLE)
-   :Column(name, type, nullability, NullS, open_method)
+   :ST_FIELD_INFO(name, type, nullability, def, NullS, open_method)
+  { }
+  Column(const char *name, const Type &type,
+         enum_nullability nullability,
+         const char *old_name,
+         enum_show_open_table open_method= SKIP_OPEN_TABLE)
+   :ST_FIELD_INFO(name, type, nullability, DEFAULT_TYPE_IMPLICIT,
+                  old_name, open_method)
+  { }
+  Column(const char *name, const Type &type,
+         enum_nullability nullability,
+         enum_show_open_table open_method= SKIP_OPEN_TABLE)
+   :ST_FIELD_INFO(name, type, nullability, DEFAULT_TYPE_IMPLICIT,
+                  NullS, open_method)
   { }
 };
 

sql/sql_select.cc

@@ -18897,6 +18897,16 @@ bool Create_tmp_table::add_schema_fields(THD *thd, TABLE *table,
       DBUG_RETURN(true); // EOM
     }
     field->init(table);
+    switch (def.def()) {
+    case DEFAULT_NONE:
+      field->flags|= NO_DEFAULT_VALUE_FLAG;
+      break;
+    case DEFAULT_TYPE_IMPLICIT:
+      break;
+    default:
+      DBUG_ASSERT(0);
+      break;
+    }
     add_field(table, field, fieldnr, param->force_not_null_cols);
   }
 

storage/innobase/handler/i_s.cc

@@ -337,7 +337,7 @@ static ST_FIELD_INFO	innodb_trx_fields_info[] =
 
 #define IDX_TRX_ISOLATION_LEVEL	16
   Column("trx_isolation_level",
-         Enum(&isolation_level_values_typelib), NOT_NULL),
+         Enum(&isolation_level_values_typelib), NOT_NULL, DEFAULT_NONE),
 
 #define IDX_TRX_UNIQUE_CHECKS	17
   Column("trx_unique_checks", SLong(1), NOT_NULL),
@@ -616,10 +616,10 @@ static ST_FIELD_INFO	innodb_locks_fields_info[] =
   Column("lock_trx_id", ULonglong(), NOT_NULL),
 
 #define IDX_LOCK_MODE		2
-  Column("lock_mode",   Enum(&lock_mode_values_typelib), NOT_NULL),
+  Column("lock_mode",   Enum(&lock_mode_values_typelib), NOT_NULL, DEFAULT_NONE),
 
 #define IDX_LOCK_TYPE		3
-  Column("lock_type",   Enum(&lock_type_values_typelib), NOT_NULL),
+  Column("lock_type",   Enum(&lock_type_values_typelib), NOT_NULL, DEFAULT_NONE),
 
 #define IDX_LOCK_TABLE		4
   Column("lock_table",  Varchar(1024), NOT_NULL),
@@ -1915,7 +1915,7 @@ static ST_FIELD_INFO	innodb_metrics_fields_info[] =
   Column("ENABLED", SLong(1), NOT_NULL),
 
 #define	METRIC_TYPE		15
-  Column("TYPE",            Enum(&metric_type_values_typelib), NOT_NULL),
+  Column("TYPE",    Enum(&metric_type_values_typelib), NOT_NULL, DEFAULT_NONE),
 
 #define	METRIC_DESC		16
   Column("COMMENT",         Varchar(NAME_LEN + 1),       NOT_NULL),
@@ -3990,10 +3990,10 @@ static ST_FIELD_INFO	i_s_innodb_buffer_page_fields_info[] =
   Column("COMPRESSED_SIZE", ULonglong(), NOT_NULL),
 
 #define IDX_BUFFER_PAGE_STATE		15 + I_S_AHI
-  Column("PAGE_STATE", Enum(&page_state_values_typelib), NOT_NULL),
+  Column("PAGE_STATE", Enum(&page_state_values_typelib), NOT_NULL, DEFAULT_NONE),
 
 #define IDX_BUFFER_PAGE_IO_FIX		16 + I_S_AHI
-  Column("IO_FIX", Enum(&io_values_typelib), NOT_NULL),
+  Column("IO_FIX", Enum(&io_values_typelib), NOT_NULL, DEFAULT_NONE),
 
 #define IDX_BUFFER_PAGE_IS_OLD		17 + I_S_AHI
   Column("IS_OLD", SLong(1), NOT_NULL),
@@ -4561,7 +4561,7 @@ static ST_FIELD_INFO	i_s_innodb_buf_page_lru_fields_info[] =
   Column("COMPRESSED", SLong(1), NOT_NULL),
 
 #define IDX_BUF_LRU_PAGE_IO_FIX		16 + I_S_AHI
-  Column("IO_FIX", Enum(&io_values_typelib), NOT_NULL),
+  Column("IO_FIX", Enum(&io_values_typelib), NOT_NULL, DEFAULT_NONE),
 
 #define IDX_BUF_LRU_PAGE_IS_OLD		17 + I_S_AHI
   Column("IS_OLD", SLong(1), NULLABLE),