From 100dd45ec45c7bf6394a1ea0cc2fc865400c4ae3 Mon Sep 17 00:00:00 2001 From: "andrey@example.com" <> Date: Tue, 28 Nov 2006 18:27:32 +0100 Subject: [PATCH] Fix for bug#24395: ALTER TABLE DISABLE KEYS doesn't work when modifying the table ENABLE|DISABLE KEYS combined with another ALTER TABLE option, different than RENAME TO did nothing. Also, if the table had disabled keys and was ALTER-ed then the end table was with enabled keys. Fixed by checking whether the table had disabled keys and enabling them in the copied table. --- myisam/mi_open.c | 21 +++++- mysql-test/r/alter_table.result | 121 ++++++++++++++++++++++++++++++++ mysql-test/t/alter_table.test | 97 +++++++++++++++++++++++++ sql/sql_table.cc | 73 +++++++++++++++++-- 4 files changed, 304 insertions(+), 8 deletions(-) diff --git a/myisam/mi_open.c b/myisam/mi_open.c index 4f298397615..db15f39c84a 100644 --- a/myisam/mi_open.c +++ b/myisam/mi_open.c @@ -1233,13 +1233,30 @@ int mi_enable_indexes(MI_INFO *info) RETURN 0 indexes are not disabled 1 all indexes are disabled - [2 non-unique indexes are disabled - NOT YET IMPLEMENTED] + 2 non-unique indexes are disabled */ int mi_indexes_are_disabled(MI_INFO *info) { MYISAM_SHARE *share= info->s; - return (! share->state.key_map && share->base.keys); + /* + No keys or all are enabled. keys is the number of keys. Left shifted + gives us only one bit set. When decreased by one, gives us all all bits + up to this one set and it gets unset. + */ + if (!share->base.keys || + (share->state.key_map == (ULL(1) << share->base.keys) - ULL(1))) + return 0; + + /* All are disabled */ + if (!share->state.key_map) + return 1; + + /* + We have keys. Some enabled, some disabled. + Don't check for any non-unique disabled but return directly 2 + */ + return 2; } diff --git a/mysql-test/r/alter_table.result b/mysql-test/r/alter_table.result index eade19e85df..6c670af88a2 100644 --- a/mysql-test/r/alter_table.result +++ b/mysql-test/r/alter_table.result @@ -528,6 +528,127 @@ create table t1 ( a timestamp ); alter table t1 add unique ( a(1) ); ERROR HY000: Incorrect sub part key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique sub keys drop table t1; +drop table if exists t1; +create table t1 (a int, key(a)); +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE +"this used not to disable the index" +alter table t1 modify a int, disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE disabled +alter table t1 enable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE +alter table t1 modify a bigint, disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE disabled +alter table t1 enable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE +alter table t1 add b char(10), disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE disabled +alter table t1 add c decimal(10,2), enable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE +"this however did" +alter table t1 disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE disabled +desc t1; +Field Type Null Key Default Extra +a bigint(20) YES MUL NULL +b char(10) YES NULL +c decimal(10,2) YES NULL +alter table t1 add d decimal(15,5); +"The key should still be disabled" +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 1 a 1 a A NULL NULL NULL YES BTREE disabled +drop table t1; +"Now will test with one unique index" +create table t1(a int, b char(10), unique(a)); +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +alter table t1 disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +alter table t1 enable keys; +"If no copy on noop change, this won't touch the data file" +"Unique index, no change" +alter table t1 modify a int, disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +"Change the type implying data copy" +"Unique index, no change" +alter table t1 modify a bigint, disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +alter table t1 modify a bigint; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +alter table t1 modify a int; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +drop table t1; +"Now will test with one unique and one non-unique index" +create table t1(a int, b char(10), unique(a), key(b)); +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +t1 1 b 1 b A NULL NULL NULL YES BTREE +alter table t1 disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +t1 1 b 1 b A NULL NULL NULL YES BTREE disabled +alter table t1 enable keys; +"If no copy on noop change, this won't touch the data file" +"The non-unique index will be disabled" +alter table t1 modify a int, disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +t1 1 b 1 b A NULL NULL NULL YES BTREE disabled +alter table t1 enable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +t1 1 b 1 b A NULL NULL NULL YES BTREE +"Change the type implying data copy" +"The non-unique index will be disabled" +alter table t1 modify a bigint, disable keys; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +t1 1 b 1 b A NULL NULL NULL YES BTREE disabled +"Change again the type, but leave the indexes as_is" +alter table t1 modify a int; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +t1 1 b 1 b A NULL NULL NULL YES BTREE disabled +"Try the same. When data is no copied on similar tables, this is noop" +alter table t1 modify a int; +show indexes from t1; +Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment +t1 0 a 1 a A NULL NULL NULL YES BTREE +t1 1 b 1 b A NULL NULL NULL YES BTREE disabled +drop table t1; create database mysqltest1; create table t1 (c1 int); alter table t1 rename mysqltest1.t1; diff --git a/mysql-test/t/alter_table.test b/mysql-test/t/alter_table.test index eba456982c8..f4624eda053 100644 --- a/mysql-test/t/alter_table.test +++ b/mysql-test/t/alter_table.test @@ -361,6 +361,103 @@ create table t1 ( a timestamp ); alter table t1 add unique ( a(1) ); drop table t1; +# +# Bug #24395: ALTER TABLE DISABLE KEYS doesn't work when modifying the table +# +# This problem happens if the data change is compatible. +# Changing to the same type is compatible for example. +# +--disable_warnings +drop table if exists t1; +--enable_warnings +create table t1 (a int, key(a)); +show indexes from t1; +--echo "this used not to disable the index" +alter table t1 modify a int, disable keys; +show indexes from t1; + +alter table t1 enable keys; +show indexes from t1; + +alter table t1 modify a bigint, disable keys; +show indexes from t1; + +alter table t1 enable keys; +show indexes from t1; + +alter table t1 add b char(10), disable keys; +show indexes from t1; + +alter table t1 add c decimal(10,2), enable keys; +show indexes from t1; + +--echo "this however did" +alter table t1 disable keys; +show indexes from t1; + +desc t1; + +alter table t1 add d decimal(15,5); +--echo "The key should still be disabled" +show indexes from t1; + +drop table t1; + +--echo "Now will test with one unique index" +create table t1(a int, b char(10), unique(a)); +show indexes from t1; +alter table t1 disable keys; +show indexes from t1; +alter table t1 enable keys; + +--echo "If no copy on noop change, this won't touch the data file" +--echo "Unique index, no change" +alter table t1 modify a int, disable keys; +show indexes from t1; + +--echo "Change the type implying data copy" +--echo "Unique index, no change" +alter table t1 modify a bigint, disable keys; +show indexes from t1; + +alter table t1 modify a bigint; +show indexes from t1; + +alter table t1 modify a int; +show indexes from t1; + +drop table t1; + +--echo "Now will test with one unique and one non-unique index" +create table t1(a int, b char(10), unique(a), key(b)); +show indexes from t1; +alter table t1 disable keys; +show indexes from t1; +alter table t1 enable keys; + + +--echo "If no copy on noop change, this won't touch the data file" +--echo "The non-unique index will be disabled" +alter table t1 modify a int, disable keys; +show indexes from t1; +alter table t1 enable keys; +show indexes from t1; + +--echo "Change the type implying data copy" +--echo "The non-unique index will be disabled" +alter table t1 modify a bigint, disable keys; +show indexes from t1; + +--echo "Change again the type, but leave the indexes as_is" +alter table t1 modify a int; +show indexes from t1; +--echo "Try the same. When data is no copied on similar tables, this is noop" +alter table t1 modify a int; +show indexes from t1; + +drop table t1; + + # # Bug#11493 - Alter table rename to default database does not work without # db name qualifying diff --git a/sql/sql_table.cc b/sql/sql_table.cc index 256b9281e9f..f82dd627101 100644 --- a/sql/sql_table.cc +++ b/sql/sql_table.cc @@ -34,11 +34,12 @@ const char *primary_key_name="PRIMARY"; static bool check_if_keyname_exists(const char *name,KEY *start, KEY *end); static char *make_unique_key_name(const char *field_name,KEY *start,KEY *end); static int copy_data_between_tables(TABLE *from,TABLE *to, - List &create, - enum enum_duplicates handle_duplicates, + List &create, + enum enum_duplicates handle_duplicates, bool ignore, - uint order_num, ORDER *order, - ha_rows *copied,ha_rows *deleted); + uint order_num, ORDER *order, + ha_rows *copied, ha_rows *deleted, + enum enum_enable_or_disable keys_onoff); /* @@ -2836,6 +2837,54 @@ int mysql_drop_indexes(THD *thd, TABLE_LIST *table_list, #endif /* NOT_USED */ +/* + Manages enabling/disabling of indexes for ALTER TABLE + + SYNOPSIS + alter_table_manage_keys() + table Target table + indexes_were_disabled Whether the indexes of the from table + were disabled + keys_onoff ENABLE | DISABLE | LEAVE_AS_IS + + RETURN VALUES + FALSE OK + TRUE Error +*/ + +static +bool alter_table_manage_keys(TABLE *table, int indexes_were_disabled, + enum enum_enable_or_disable keys_onoff) +{ + int error= 0; + DBUG_ENTER("alter_table_manage_keys"); + DBUG_PRINT("enter", ("table=%p were_disabled=%d on_off=%d", + table, indexes_were_disabled, keys_onoff)); + + switch (keys_onoff) { + case ENABLE: + error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE); + break; + case LEAVE_AS_IS: + if (!indexes_were_disabled) + break; + /* fall-through: disabled indexes */ + case DISABLE: + error= table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE); + } + + if (error == HA_ERR_WRONG_COMMAND) + { + push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_NOTE, + ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA), table->table_name); + error= 0; + } else if (error) + table->file->print_error(error, MYF(0)); + + DBUG_RETURN(error); +} + + /* Alter table */ @@ -3375,7 +3424,14 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name, if (!new_table->is_view) error=copy_data_between_tables(table,new_table,create_list, handle_duplicates, ignore, - order_num, order, &copied, &deleted); + order_num, order, &copied, &deleted, + alter_info->keys_onoff); + /* + No need to have call to alter_table_manage_keys() in the else because + in 4.1 we always copy data, except for views. In 5.0 it could happen + that no data is copied and only frm is modified. Then we have to handle + alter_info->keys_onoff outside of copy_data_between_tables + */ thd->last_insert_id=next_insert_id; // Needed for correct log thd->count_cuted_fields= CHECK_FIELD_IGNORE; @@ -3598,7 +3654,8 @@ copy_data_between_tables(TABLE *from,TABLE *to, bool ignore, uint order_num, ORDER *order, ha_rows *copied, - ha_rows *deleted) + ha_rows *deleted, + enum enum_enable_or_disable keys_onoff) { int error; Copy_field *copy,*copy_end; @@ -3630,6 +3687,10 @@ copy_data_between_tables(TABLE *from,TABLE *to, if (to->file->external_lock(thd, F_WRLCK)) DBUG_RETURN(-1); + + /* We need external lock before we can disable/enable keys */ + alter_table_manage_keys(to, from->file->indexes_are_disabled(), keys_onoff); + from->file->info(HA_STATUS_VARIABLE); to->file->start_bulk_insert(from->file->records);