diff options
Diffstat (limited to 'sql/sql_table.cc')
| -rw-r--r-- | sql/sql_table.cc | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/sql/sql_table.cc b/sql/sql_table.cc index 67f17b893d0..efccd2226c3 100644 --- a/sql/sql_table.cc +++ b/sql/sql_table.cc @@ -6521,10 +6521,11 @@ static int compare_uint(const uint *s, const uint *t) return (*s < *t) ? -1 : ((*s > *t) ? 1 : 0); } -enum class Compare_keys +enum class Compare_keys : uint32_t { Equal, EqualButKeyPartLength, + EqualButComment, NotEqual }; @@ -6608,11 +6609,12 @@ Compare_keys compare_keys_but_name(const KEY *table_key, const KEY *new_key, return Compare_keys::NotEqual; /* Check that key comment is not changed. */ - if (table_key->comment.length != new_key->comment.length || - (table_key->comment.length && - memcmp(table_key->comment.str, new_key->comment.str, - table_key->comment.length) != 0)) - return Compare_keys::NotEqual; + if (cmp(table_key->comment, new_key->comment) != 0) + { + if (result != Compare_keys::Equal) + return Compare_keys::NotEqual; + result= Compare_keys::EqualButComment; + } return result; } @@ -7002,6 +7004,9 @@ static bool fill_alter_inplace_info(THD *thd, TABLE *table, bool varchar, case Compare_keys::EqualButKeyPartLength: ha_alter_info->handler_flags|= ALTER_COLUMN_INDEX_LENGTH; continue; + case Compare_keys::EqualButComment: + ha_alter_info->handler_flags|= ALTER_CHANGE_INDEX_COMMENT; + continue; case Compare_keys::NotEqual: break; } |