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Additional tweak to fix for bug #10543, to prevent a change in

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behavior when extending fields that were fully part of a
multi-part key.
This commit is contained in:
jimw@mysql.com
2005-06-02 10:00:36 -07:00
parent ef9ef1f958
commit d147e69bb7
3 changed files with 42 additions and 0 deletions
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4
sql/sql_table.cc
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@@ -3341,11 +3341,15 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
previous type, or the field length is less than the key part
length, unset the key part length.
We also unset the key part length if it is the same as the
old field's length, so the whole new field will be used.
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->field->field_length == key_part_length ||
(cfield->length && (cfield->length < key_part_length /
key_part->field->charset()->mbmaxlen)))
key_part_length= 0; // Use whole field