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MDEV-25803 innodb.alter_candidate_key fix

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There is a case when implicit primary key may be changed when removing
NOT NULL from the part of unique key. In that case we update
modified_primary_key which is then used to not skip key sorting.

According to is_candidate_key() there is no other cases when primary
kay may be changed implicitly.
This commit is contained in:
Aleksey Midenkov
2021-11-02 04:52:03 +03:00
parent 63c922ae0c
commit c6207ecba4
4 changed files with 24 additions and 10 deletions
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28
sql/sql_table.cc
View File

@ -4215,8 +4215,7 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
MyISAM/Aria cannot add index inplace so we are safe to qsort key info in
that case. And if we don't add index then we do not need qsort at all.
*/
if (!(create_info->options & HA_CREATE_TMP_ALTER) ||
alter_info->flags & ALTER_ADD_INDEX)
if (!(create_info->options & HA_SKIP_KEY_SORT))
{
/*
Sort keys in optimized order.
@ -8035,7 +8034,6 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
uint used_fields, dropped_sys_vers_fields= 0;
KEY *key_info=table->key_info;
bool rc= TRUE;
bool modified_primary_key= FALSE;
bool vers_system_invisible= false;
Create_field *def;
Field **f_ptr,*field;
@ -8420,6 +8418,12 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
if (key_info->flags & HA_INVISIBLE_KEY)
continue;
const char *key_name= key_info->name.str;
const bool primary_key= table->s->primary_key == i;
const bool explicit_pk= primary_key &&
!my_strcasecmp(system_charset_info, key_name,
primary_key_name);
const bool implicit_pk= primary_key && !explicit_pk;
Alter_drop *drop;
drop_it.rewind();
while ((drop=drop_it++))
@ -8433,7 +8437,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
if (table->s->tmp_table == NO_TMP_TABLE)
{
(void) delete_statistics_for_index(thd, table, key_info, FALSE);
if (i == table->s->primary_key)
if (primary_key)
{
KEY *tab_key_info= table->key_info;
for (uint j=0; j < table->s->keys; j++, tab_key_info++)
@ -8478,13 +8482,19 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
}
if (!cfield)
{
if (table->s->primary_key == i)
modified_primary_key= TRUE;
if (primary_key)
alter_ctx->modified_primary_key= true;
delete_index_stat= TRUE;
if (!(kfield->flags & VERS_SYSTEM_FIELD))
dropped_key_part= key_part_name;
continue; // Field is removed
}
DBUG_ASSERT(!primary_key || kfield->flags & NOT_NULL_FLAG);
if (implicit_pk && !alter_ctx->modified_primary_key &&
!(cfield->flags & NOT_NULL_FLAG))
alter_ctx->modified_primary_key= true;
key_part_length= key_part->length;
if (cfield->field) // Not new field
{
@ -8533,7 +8543,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
{
if (delete_index_stat)
(void) delete_statistics_for_index(thd, table, key_info, FALSE);
else if (modified_primary_key &&
else if (alter_ctx->modified_primary_key &&
key_info->user_defined_key_parts != key_info->ext_key_parts)
(void) delete_statistics_for_index(thd, table, key_info, TRUE);
}
@ -8575,7 +8585,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
key_type= Key::SPATIAL;
else if (key_info->flags & HA_NOSAME)
{
if (! my_strcasecmp(system_charset_info, key_name, primary_key_name))
if (explicit_pk)
key_type= Key::PRIMARY;
else
key_type= Key::UNIQUE;
@ -9941,6 +9951,8 @@ do_continue:;
tmp_disable_binlog(thd);
create_info->options|=HA_CREATE_TMP_ALTER;
if (!(alter_info->flags & ALTER_ADD_INDEX) && !alter_ctx.modified_primary_key)
create_info->options|= HA_SKIP_KEY_SORT;
create_info->alias= alter_ctx.table_name;
error= create_table_impl(thd,
&alter_ctx.db, &alter_ctx.table_name,