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Bug#26180 Can't add columns to tables created with utf8 (regular) text indexes

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Backporting from 6.0.
This commit is contained in:
Alexander Barkov
2009-11-09 15:35:18 +04:00
parent 510844e72a
commit d17f4d9d5c
3 changed files with 72 additions and 2 deletions
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44
sql/sql_table.cc
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@ -5933,6 +5933,35 @@ bool alter_table_manage_keys(TABLE *table, int indexes_were_disabled,
}
/**
maximum possible length for certain blob types.
@param[in] type Blob type (e.g. MYSQL_TYPE_TINY_BLOB)
@return
length
*/
static uint
blob_length_by_type(enum_field_types type)
{
switch (type)
{
case MYSQL_TYPE_TINY_BLOB:
return 255;
case MYSQL_TYPE_BLOB:
return 65535;
case MYSQL_TYPE_MEDIUM_BLOB:
return 16777215;
case MYSQL_TYPE_LONG_BLOB:
return 4294967295U;
default:
DBUG_ASSERT(0); // we should never go here
return 0;
}
}
/**
Prepare column and key definitions for CREATE TABLE in ALTER TABLE.
@ -6228,6 +6257,14 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
BLOBs may have cfield->length == 0, which is why we test it before
checking whether cfield->length < key_part_length (in chars).
In case of TEXTs we check the data type maximum length *in bytes*
to key part length measured *in characters* (i.e. key_part_length
devided to mbmaxlen). This is because it's OK to have:
CREATE TABLE t1 (a tinytext, key(a(254)) character set utf8);
In case of this example:
- data type maximum length is 255.
- key_part_length is 1016 (=254*4, where 4 is mbmaxlen)
*/
if (!Field::type_can_have_key_part(cfield->field->type()) ||
!Field::type_can_have_key_part(cfield->sql_type) ||
@ -6235,8 +6272,11 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
(key_info->flags & HA_SPATIAL) ||
(cfield->field->field_length == key_part_length &&
!f_is_blob(key_part->key_type)) ||
(cfield->length && (cfield->length < key_part_length /
key_part->field->charset()->mbmaxlen)))
(cfield->length && (((cfield->sql_type >= MYSQL_TYPE_TINY_BLOB &&
cfield->sql_type <= MYSQL_TYPE_BLOB) ?
blob_length_by_type(cfield->sql_type) :
cfield->length) <
key_part_length / key_part->field->charset()->mbmaxlen)))
key_part_length= 0; // Use whole field
}
key_part_length /= key_part->field->charset()->mbmaxlen;