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Fix for bug #28125: ERROR 2013 when adding index.

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Problem: we may break a multibyte char sequence using a key 
reduced to maximum allowed length for a storage engine
(that leads to failed assertion in the innodb code, 
see also #17530). 

Fix: align truncated key length to multibyte char boundary.
This commit is contained in:
ramil/ram@mysql.com/ramil.myoffice.izhnet.ru
2007-07-18 12:13:45 +05:00
parent 261acdbbea
commit 100faf97c4
3 changed files with 26 additions and 3 deletions
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6
sql/sql_table.cc
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@@ -1357,6 +1357,8 @@ static int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
length);
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TOO_LONG_KEY, warn_buff);
/* Align key length to multibyte char boundary */
length-= length % sql_field->charset->mbmaxlen;
}
else
{
@@ -1387,8 +1389,6 @@ static int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
if (length > file->max_key_part_length() && key->type != Key::FULLTEXT)
{
length= file->max_key_part_length();
/* Align key length to multibyte char boundary */
length-= length % sql_field->charset->mbmaxlen;
if (key->type == Key::MULTIPLE)
{
/* not a critical problem */
@@ -1397,6 +1397,8 @@ static int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
length);
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TOO_LONG_KEY, warn_buff);
/* Align key length to multibyte char boundary */
length-= length % sql_field->charset->mbmaxlen;
}
else
{