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MDEV-9548: Alter table (renaming and adding index) fails with "Incorrect key file for table"

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MDEV-9469: 'Incorrect key file' on ALTER TABLE

InnoDB needs to rebuild table if column name is changed and
added index (or foreign key) is created based on this new
name in same alter table.
This commit is contained in:
Jan Lindström
2016-02-15 14:43:42 +02:00
parent daa4a2c7ee
commit c0b6c27dbe
8 changed files with 319 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

92
mysql-test/suite/innodb/r/innodb-alter-table.result
View File

@ -43,3 +43,95 @@ KEY `mdl_courmodu_gro_ix` (`groupingid`)
# Inserting 2701 rows into the table...
ALTER TABLE moodle19.mdl_course_modules ADD stefantest LONGTEXT CHARACTER SET utf8 COLLATE utf8_general_ci AFTER showdescription;
drop database moodle19;
use test;
CREATE TABLE `w_findispmon05u` (
`atpkey` INT(11) NOT NULL DEFAULT '0',
`atzo05` INT(11) NULL DEFAULT NULL,
`pos` BIGINT(21) NULL DEFAULT NULL,
`f5BnvB` INT(9) NULL DEFAULT NULL,
`f5atbvb` INT(11) NULL DEFAULT NULL,
`f5atbwmg` INT(11) NULL DEFAULT NULL,
`f5pBneu` BIGINT(12) NULL DEFAULT NULL,
`atbwdt` INT(11) NULL DEFAULT NULL,
`atbwzt` INT(11) NULL DEFAULT NULL,
`atbart` VARCHAR(10) NULL DEFAULT NULL
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB;
ALTER TABLE `w_findispmon05u`
CHANGE COLUMN `atpkey` `f5atpkey` INT(11) NOT NULL DEFAULT '0' FIRST,
CHANGE COLUMN `atzo05` `f5atzo05` INT(11) NULL DEFAULT NULL AFTER `f5atpkey`,
CHANGE COLUMN `atbwdt` `f5atbwdt` INT(11) NULL DEFAULT NULL AFTER `f5pBneu`,
CHANGE COLUMN `atbwzt` `f5atbwzt` INT(11) NULL DEFAULT NULL AFTER `f5atbwdt`,
CHANGE COLUMN `atbart` `f5atbart` VARCHAR(10) NULL DEFAULT NULL AFTER `f5atbwzt`,
ADD INDEX `atpkey` (`f5atpkey`),
ADD INDEX `inatkey` (`f5atzo05`, `pos`),
ADD INDEX `pos` (`pos`, `f5atzo05`);
SHOW WARNINGS;
Level Code Message
SHOW CREATE TABLE `w_findispmon05u`;
Table Create Table
w_findispmon05u CREATE TABLE `w_findispmon05u` (
`f5atpkey` int(11) NOT NULL DEFAULT '0',
`f5atzo05` int(11) DEFAULT NULL,
`pos` bigint(21) DEFAULT NULL,
`f5BnvB` int(9) DEFAULT NULL,
`f5atbvb` int(11) DEFAULT NULL,
`f5atbwmg` int(11) DEFAULT NULL,
`f5pBneu` bigint(12) DEFAULT NULL,
`f5atbwdt` int(11) DEFAULT NULL,
`f5atbwzt` int(11) DEFAULT NULL,
`f5atbart` varchar(10) DEFAULT NULL,
KEY `atpkey` (`f5atpkey`),
KEY `inatkey` (`f5atzo05`,`pos`),
KEY `pos` (`pos`,`f5atzo05`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
DROP TABLE `w_findispmon05u`;
CREATE TABLE t (
a INT NOT NULL,
b INT NOT NULL,
PRIMARY KEY (a)
) ENGINE=INNODB;
ALTER TABLE t
CHANGE COLUMN b c INT NOT NULL,
ADD UNIQUE INDEX (c);
SHOW WARNINGS;
Level Code Message
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL,
`c` int(11) NOT NULL,
PRIMARY KEY (`a`),
UNIQUE KEY `c` (`c`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
ALTER TABLE t
CHANGE COLUMN c b INT NOT NULL,
ADD UNIQUE INDEX (c);
ERROR 42000: Key column 'c' doesn't exist in table
DROP TABLE t;
CREATE TABLE parent (
a INT NOT NULL,
b INT NOT NULL,
PRIMARY KEY (a)
) ENGINE=INNODB;
CREATE TABLE child (
a INT NOT NULL,
b INT NOT NULL,
PRIMARY KEY (a)
) ENGINE=INNODB;
ALTER TABLE child
CHANGE COLUMN b c INT NOT NULL,
ADD FOREIGN KEY (c) REFERENCES parent(a);
SHOW WARNINGS;
Level Code Message
SHOW CREATE TABLE child;
Table Create Table
child CREATE TABLE `child` (
`a` int(11) NOT NULL,
`c` int(11) NOT NULL,
PRIMARY KEY (`a`),
KEY `c` (`c`),
CONSTRAINT `child_ibfk_1` FOREIGN KEY (`c`) REFERENCES `parent` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
DROP TABLE child, parent;

81
mysql-test/suite/innodb/t/innodb-alter-table.test
View File

@ -57,3 +57,84 @@ while ($num)
ALTER TABLE moodle19.mdl_course_modules ADD stefantest LONGTEXT CHARACTER SET utf8 COLLATE utf8_general_ci AFTER showdescription;
drop database moodle19;
#
# Mdev-9469: Incorrect key file on alter table
#
use test;
CREATE TABLE `w_findispmon05u` (
`atpkey` INT(11) NOT NULL DEFAULT '0',
`atzo05` INT(11) NULL DEFAULT NULL,
`pos` BIGINT(21) NULL DEFAULT NULL,
`f5BnvB` INT(9) NULL DEFAULT NULL,
`f5atbvb` INT(11) NULL DEFAULT NULL,
`f5atbwmg` INT(11) NULL DEFAULT NULL,
`f5pBneu` BIGINT(12) NULL DEFAULT NULL,
`atbwdt` INT(11) NULL DEFAULT NULL,
`atbwzt` INT(11) NULL DEFAULT NULL,
`atbart` VARCHAR(10) NULL DEFAULT NULL
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB;
ALTER TABLE `w_findispmon05u`
CHANGE COLUMN `atpkey` `f5atpkey` INT(11) NOT NULL DEFAULT '0' FIRST,
CHANGE COLUMN `atzo05` `f5atzo05` INT(11) NULL DEFAULT NULL AFTER `f5atpkey`,
CHANGE COLUMN `atbwdt` `f5atbwdt` INT(11) NULL DEFAULT NULL AFTER `f5pBneu`,
CHANGE COLUMN `atbwzt` `f5atbwzt` INT(11) NULL DEFAULT NULL AFTER `f5atbwdt`,
CHANGE COLUMN `atbart` `f5atbart` VARCHAR(10) NULL DEFAULT NULL AFTER `f5atbwzt`,
ADD INDEX `atpkey` (`f5atpkey`),
ADD INDEX `inatkey` (`f5atzo05`, `pos`),
ADD INDEX `pos` (`pos`, `f5atzo05`);
SHOW WARNINGS;
SHOW CREATE TABLE `w_findispmon05u`;
DROP TABLE `w_findispmon05u`;
CREATE TABLE t (
a INT NOT NULL,
b INT NOT NULL,
PRIMARY KEY (a)
) ENGINE=INNODB;
ALTER TABLE t
CHANGE COLUMN b c INT NOT NULL,
ADD UNIQUE INDEX (c);
SHOW WARNINGS;
SHOW CREATE TABLE t;
# this should fail
--error 1072
ALTER TABLE t
CHANGE COLUMN c b INT NOT NULL,
ADD UNIQUE INDEX (c);
DROP TABLE t;
#
# Check Foreign Keys
#
CREATE TABLE parent (
a INT NOT NULL,
b INT NOT NULL,
PRIMARY KEY (a)
) ENGINE=INNODB;
CREATE TABLE child (
a INT NOT NULL,
b INT NOT NULL,
PRIMARY KEY (a)
) ENGINE=INNODB;
ALTER TABLE child
CHANGE COLUMN b c INT NOT NULL,
ADD FOREIGN KEY (c) REFERENCES parent(a);
SHOW WARNINGS;
SHOW CREATE TABLE child;
DROP TABLE child, parent;

59
storage/innobase/handler/handler0alter.cc
View File

@ -200,12 +200,14 @@ innobase_fulltext_exist(
/*******************************************************************//**
Determine if ALTER TABLE needs to rebuild the table.
@param ha_alter_info the DDL operation
@param altered_table MySQL original table
@return whether it is necessary to rebuild the table */
static __attribute__((nonnull, warn_unused_result))
bool
innobase_need_rebuild(
/*==================*/
const Alter_inplace_info* ha_alter_info)
const Alter_inplace_info* ha_alter_info,
const TABLE* altered_table)
{
if (ha_alter_info->handler_flags
== Alter_inplace_info::CHANGE_CREATE_OPTION
@ -217,6 +219,34 @@ innobase_need_rebuild(
return(false);
}
/* If alter table changes column name and adds a new
index, we need to check is this new index created
to new column name. This is because column name
changes are done normally after creating indexes. */
if ((ha_alter_info->handler_flags
& Alter_inplace_info::ALTER_COLUMN_NAME) &&
((ha_alter_info->handler_flags
& Alter_inplace_info::ADD_INDEX) ||
(ha_alter_info->handler_flags
& Alter_inplace_info::ADD_FOREIGN_KEY))) {
for (ulint i = 0; i < ha_alter_info->key_count; i++) {
const KEY* key = &ha_alter_info->key_info_buffer[
ha_alter_info->index_add_buffer[i]];
for (ulint j = 0; j < key->user_defined_key_parts; j++) {
const KEY_PART_INFO* key_part = &(key->key_part[j]);
const Field* field = altered_table->field[key_part->fieldnr];
/* Field used on added index is renamed on
this same alter table. We need table
rebuild. */
if (field->flags & FIELD_IS_RENAMED) {
return (true);
}
}
}
}
return(!!(ha_alter_info->handler_flags & INNOBASE_ALTER_REBUILD));
}
@ -531,7 +561,7 @@ ha_innobase::check_if_supported_inplace_alter(
operation is possible. */
} else if (((ha_alter_info->handler_flags
& Alter_inplace_info::ADD_PK_INDEX)
|| innobase_need_rebuild(ha_alter_info))
|| innobase_need_rebuild(ha_alter_info, table))
&& (innobase_fulltext_exist(altered_table))) {
/* Refuse to rebuild the table online, if
fulltext indexes are to survive the rebuild. */
@ -1532,7 +1562,8 @@ innobase_create_index_def(
index_def_t* index, /*!< out: index definition */
mem_heap_t* heap, /*!< in: heap where memory
is allocated */
const Field** fields) /*!z in: MySQL table fields */
const Field** fields) /*!< in: MySQL table fields
*/
{
const KEY* key = &keys[key_number];
ulint i;
@ -1827,9 +1858,11 @@ innobase_create_key_defs(
bool& add_fts_doc_id,
/*!< in: whether we need to add new DOC ID
column for FTS index */
bool& add_fts_doc_idx)
bool& add_fts_doc_idx,
/*!< in: whether we need to add new DOC ID
index for FTS index */
const TABLE* table)
/*!< in: MySQL table that is being altered */
{
index_def_t* indexdef;
index_def_t* indexdefs;
@ -1879,7 +1912,8 @@ innobase_create_key_defs(
}
const bool rebuild = new_primary || add_fts_doc_id
|| innobase_need_rebuild(ha_alter_info);
|| innobase_need_rebuild(ha_alter_info, table);
/* Reserve one more space if new_primary is true, and we might
need to add the FTS_DOC_ID_INDEX */
indexdef = indexdefs = static_cast<index_def_t*>(
@ -2716,7 +2750,8 @@ prepare_inplace_alter_table_dict(
ctx->heap, ha_alter_info, altered_table, ctx->num_to_add_index,
num_fts_index,
row_table_got_default_clust_index(ctx->new_table),
fts_doc_id_col, add_fts_doc_id, add_fts_doc_id_idx);
fts_doc_id_col, add_fts_doc_id, add_fts_doc_id_idx,
old_table);
new_clustered = DICT_CLUSTERED & index_defs[0].ind_type;
@ -2729,7 +2764,7 @@ prepare_inplace_alter_table_dict(
/* This is not an online operation (LOCK=NONE). */
} else if (ctx->add_autoinc == ULINT_UNDEFINED
&& num_fts_index == 0
&& (!innobase_need_rebuild(ha_alter_info)
&& (!innobase_need_rebuild(ha_alter_info, old_table)
|| !innobase_fulltext_exist(altered_table))) {
/* InnoDB can perform an online operation (LOCK=NONE). */
} else {
@ -2746,7 +2781,7 @@ prepare_inplace_alter_table_dict(
is just copied from old table and stored in indexdefs[0] */
DBUG_ASSERT(!add_fts_doc_id || new_clustered);
DBUG_ASSERT(!!new_clustered ==
(innobase_need_rebuild(ha_alter_info)
(innobase_need_rebuild(ha_alter_info, old_table)
|| add_fts_doc_id));
/* Allocate memory for dictionary index definitions */
@ -2996,7 +3031,7 @@ prepare_inplace_alter_table_dict(
add_cols, ctx->heap);
ctx->add_cols = add_cols;
} else {
DBUG_ASSERT(!innobase_need_rebuild(ha_alter_info));
DBUG_ASSERT(!innobase_need_rebuild(ha_alter_info, old_table));
if (!ctx->new_table->fts
&& innobase_fulltext_exist(altered_table)) {
@ -3017,7 +3052,7 @@ prepare_inplace_alter_table_dict(
ctx->add_index[a] = row_merge_create_index(
ctx->trx, ctx->new_table,
&index_defs[a]);
&index_defs[a], ctx->col_names);
add_key_nums[a] = index_defs[a].key_number;
@ -3862,7 +3897,7 @@ err_exit:
if (!(ha_alter_info->handler_flags & INNOBASE_ALTER_DATA)
|| (ha_alter_info->handler_flags
== Alter_inplace_info::CHANGE_CREATE_OPTION
&& !innobase_need_rebuild(ha_alter_info))) {
&& !innobase_need_rebuild(ha_alter_info, table))) {
if (heap) {
ha_alter_info->handler_ctx
@ -4036,7 +4071,7 @@ ok_exit:
if (ha_alter_info->handler_flags
== Alter_inplace_info::CHANGE_CREATE_OPTION
&& !innobase_need_rebuild(ha_alter_info)) {
&& !innobase_need_rebuild(ha_alter_info, table)) {
goto ok_exit;
}

5
storage/innobase/include/row0merge.h
View File

@ -252,8 +252,11 @@ row_merge_create_index(
/*===================*/
trx_t* trx, /*!< in/out: trx (sets error_state) */
dict_table_t* table, /*!< in: the index is on this table */
const index_def_t* index_def);
const index_def_t* index_def,
/*!< in: the index definition */
const char** col_names);
/*! in: column names if columns are
renamed or NULL */
/*********************************************************************//**
Check if a transaction can use an index.
@return TRUE if index can be used by the transaction else FALSE */

26
storage/innobase/row/row0merge.cc
View File

@ -3461,8 +3461,11 @@ row_merge_create_index(
/*===================*/
trx_t* trx, /*!< in/out: trx (sets error_state) */
dict_table_t* table, /*!< in: the index is on this table */
const index_def_t* index_def)
const index_def_t* index_def,
/*!< in: the index definition */
const char** col_names)
/*! in: column names if columns are
renamed or NULL */
{
dict_index_t* index;
dberr_t err;
@ -3482,9 +3485,24 @@ row_merge_create_index(
for (i = 0; i < n_fields; i++) {
index_field_t* ifield = &index_def->fields[i];
const char * col_name = ifield->col_name ?
dict_table_get_col_name_for_mysql(table, ifield->col_name) :
dict_table_get_col_name(table, ifield->col_no);
const char * col_name;
/*
Alter table renaming a column and then adding a index
to this new name e.g ALTER TABLE t
CHANGE COLUMN b c INT NOT NULL, ADD UNIQUE INDEX (c);
requires additional check as column names are not yet
changed when new index definitions are created. Table's
new column names are on a array of column name pointers
if any of the column names are changed. */
if (col_names && col_names[i]) {
col_name = col_names[i];
} else {
col_name = ifield->col_name ?
dict_table_get_col_name_for_mysql(table, ifield->col_name) :
dict_table_get_col_name(table, ifield->col_no);
}
dict_mem_index_add_field(
index,

59
storage/xtradb/handler/handler0alter.cc
View File

@ -197,12 +197,14 @@ innobase_fulltext_exist(
/*******************************************************************//**
Determine if ALTER TABLE needs to rebuild the table.
@param ha_alter_info the DDL operation
@param altered_table MySQL original table
@return whether it is necessary to rebuild the table */
static __attribute__((nonnull, warn_unused_result))
bool
innobase_need_rebuild(
/*==================*/
const Alter_inplace_info* ha_alter_info)
const Alter_inplace_info* ha_alter_info,
const TABLE* altered_table)
{
if (ha_alter_info->handler_flags
== Alter_inplace_info::CHANGE_CREATE_OPTION
@ -214,6 +216,34 @@ innobase_need_rebuild(
return(false);
}
/* If alter table changes column name and adds a new
index, we need to check is this new index created
to new column name. This is because column name
changes are done normally after creating indexes. */
if ((ha_alter_info->handler_flags
& Alter_inplace_info::ALTER_COLUMN_NAME) &&
((ha_alter_info->handler_flags
& Alter_inplace_info::ADD_INDEX) ||
(ha_alter_info->handler_flags
& Alter_inplace_info::ADD_FOREIGN_KEY))) {
for (ulint i = 0; i < ha_alter_info->key_count; i++) {
const KEY* key = &ha_alter_info->key_info_buffer[
ha_alter_info->index_add_buffer[i]];
for (ulint j = 0; j < key->user_defined_key_parts; j++) {
const KEY_PART_INFO* key_part = &(key->key_part[j]);
const Field* field = altered_table->field[key_part->fieldnr];
/* Field used on added index is renamed on
this same alter table. We need table
rebuild. */
if (field->flags & FIELD_IS_RENAMED) {
return (true);
}
}
}
}
return(!!(ha_alter_info->handler_flags & INNOBASE_ALTER_REBUILD));
}
@ -529,7 +559,7 @@ ha_innobase::check_if_supported_inplace_alter(
operation is possible. */
} else if (((ha_alter_info->handler_flags
& Alter_inplace_info::ADD_PK_INDEX)
|| innobase_need_rebuild(ha_alter_info))
|| innobase_need_rebuild(ha_alter_info, table))
&& (innobase_fulltext_exist(altered_table))) {
/* Refuse to rebuild the table online, if
fulltext indexes are to survive the rebuild. */
@ -1528,7 +1558,8 @@ innobase_create_index_def(
index_def_t* index, /*!< out: index definition */
mem_heap_t* heap, /*!< in: heap where memory
is allocated */
const Field** fields) /*!z in: MySQL table fields */
const Field** fields) /*!< in: MySQL table fields
*/
{
const KEY* key = &keys[key_number];
ulint i;
@ -1824,9 +1855,11 @@ innobase_create_key_defs(
bool& add_fts_doc_id,
/*!< in: whether we need to add new DOC ID
column for FTS index */
bool& add_fts_doc_idx)
bool& add_fts_doc_idx,
/*!< in: whether we need to add new DOC ID
index for FTS index */
const TABLE* table)
/*!< in: MySQL table that is being altered */
{
index_def_t* indexdef;
index_def_t* indexdefs;
@ -1876,7 +1909,8 @@ innobase_create_key_defs(
}
const bool rebuild = new_primary || add_fts_doc_id
|| innobase_need_rebuild(ha_alter_info);
|| innobase_need_rebuild(ha_alter_info, table);
/* Reserve one more space if new_primary is true, and we might
need to add the FTS_DOC_ID_INDEX */
indexdef = indexdefs = static_cast<index_def_t*>(
@ -2714,7 +2748,8 @@ prepare_inplace_alter_table_dict(
ctx->heap, ha_alter_info, altered_table, ctx->num_to_add_index,
num_fts_index,
row_table_got_default_clust_index(ctx->new_table),
fts_doc_id_col, add_fts_doc_id, add_fts_doc_id_idx);
fts_doc_id_col, add_fts_doc_id, add_fts_doc_id_idx,
old_table);
new_clustered = DICT_CLUSTERED & index_defs[0].ind_type;
@ -2727,7 +2762,7 @@ prepare_inplace_alter_table_dict(
/* This is not an online operation (LOCK=NONE). */
} else if (ctx->add_autoinc == ULINT_UNDEFINED
&& num_fts_index == 0
&& (!innobase_need_rebuild(ha_alter_info)
&& (!innobase_need_rebuild(ha_alter_info, old_table)
|| !innobase_fulltext_exist(altered_table))) {
/* InnoDB can perform an online operation (LOCK=NONE). */
} else {
@ -2744,7 +2779,7 @@ prepare_inplace_alter_table_dict(
is just copied from old table and stored in indexdefs[0] */
DBUG_ASSERT(!add_fts_doc_id || new_clustered);
DBUG_ASSERT(!!new_clustered ==
(innobase_need_rebuild(ha_alter_info)
(innobase_need_rebuild(ha_alter_info, old_table)
|| add_fts_doc_id));
/* Allocate memory for dictionary index definitions */
@ -2994,7 +3029,7 @@ prepare_inplace_alter_table_dict(
add_cols, ctx->heap);
ctx->add_cols = add_cols;
} else {
DBUG_ASSERT(!innobase_need_rebuild(ha_alter_info));
DBUG_ASSERT(!innobase_need_rebuild(ha_alter_info, old_table));
if (!ctx->new_table->fts
&& innobase_fulltext_exist(altered_table)) {
@ -3015,7 +3050,7 @@ prepare_inplace_alter_table_dict(
ctx->add_index[a] = row_merge_create_index(
ctx->trx, ctx->new_table,
&index_defs[a]);
&index_defs[a], ctx->col_names);
add_key_nums[a] = index_defs[a].key_number;
@ -3869,7 +3904,7 @@ err_exit:
if (!(ha_alter_info->handler_flags & INNOBASE_ALTER_DATA)
|| (ha_alter_info->handler_flags
== Alter_inplace_info::CHANGE_CREATE_OPTION
&& !innobase_need_rebuild(ha_alter_info))) {
&& !innobase_need_rebuild(ha_alter_info, table))) {
if (heap) {
ha_alter_info->handler_ctx
@ -4043,7 +4078,7 @@ ok_exit:
if (ha_alter_info->handler_flags
== Alter_inplace_info::CHANGE_CREATE_OPTION
&& !innobase_need_rebuild(ha_alter_info)) {
&& !innobase_need_rebuild(ha_alter_info, table)) {
goto ok_exit;
}

5
storage/xtradb/include/row0merge.h
View File

@ -252,8 +252,11 @@ row_merge_create_index(
/*===================*/
trx_t* trx, /*!< in/out: trx (sets error_state) */
dict_table_t* table, /*!< in: the index is on this table */
const index_def_t* index_def);
const index_def_t* index_def,
/*!< in: the index definition */
const char** col_names);
/*! in: column names if columns are
renamed or NULL */
/*********************************************************************//**
Check if a transaction can use an index.
@return TRUE if index can be used by the transaction else FALSE */

26
storage/xtradb/row/row0merge.cc
View File

@ -3470,8 +3470,11 @@ row_merge_create_index(
/*===================*/
trx_t* trx, /*!< in/out: trx (sets error_state) */
dict_table_t* table, /*!< in: the index is on this table */
const index_def_t* index_def)
const index_def_t* index_def,
/*!< in: the index definition */
const char** col_names)
/*! in: column names if columns are
renamed or NULL */
{
dict_index_t* index;
dberr_t err;
@ -3491,9 +3494,24 @@ row_merge_create_index(
for (i = 0; i < n_fields; i++) {
index_field_t* ifield = &index_def->fields[i];
const char * col_name = ifield->col_name ?
dict_table_get_col_name_for_mysql(table, ifield->col_name) :
dict_table_get_col_name(table, ifield->col_no);
const char * col_name;
/*
Alter table renaming a column and then adding a index
to this new name e.g ALTER TABLE t
CHANGE COLUMN b c INT NOT NULL, ADD UNIQUE INDEX (c);
requires additional check as column names are not yet
changed when new index definitions are created. Table's
new column names are on a array of column name pointers
if any of the column names are changed. */
if (col_names && col_names[i]) {
col_name = col_names[i];
} else {
col_name = ifield->col_name ?
dict_table_get_col_name_for_mysql(table, ifield->col_name) :
dict_table_get_col_name(table, ifield->col_no);
}
dict_mem_index_add_field(
index,