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Fix partial keys when converting VARCHAR to TEXT. (Bug #10543)

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jimw@mysql.com
2005-05-25 18:11:47 -07:00
parent b763679f1c
commit ef9ef1f958
5 changed files with 84 additions and 6 deletions
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21
sql/sql_table.cc
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@@ -3334,12 +3334,21 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
continue; // Field is removed
uint key_part_length=key_part->length;
if (cfield->field) // Not new field
{ // Check if sub key
if (cfield->field->type() != FIELD_TYPE_BLOB &&
(cfield->field->pack_length() == key_part_length ||
cfield->length <= key_part_length /
key_part->field->charset()->mbmaxlen))
key_part_length=0; // Use whole field
{
/*
If the field can't have only a part used in a key according to its
new type, or should not be used partially according to its
previous type, or the field length is less than the key part
length, unset the key part length.
BLOBs may have cfield->length == 0, which is why we test it before
checking whether cfield->length < key_part_length (in chars).
*/
if (!Field::type_can_have_key_part(cfield->field->type()) ||
!Field::type_can_have_key_part(cfield->sql_type) ||
(cfield->length && (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;
key_parts.push_back(new key_part_spec(cfield->field_name,