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MDEV-31869 Server aborts when table does drop column

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- InnoDB aborts when table is dropping the column. This is
caused by 5f09b53bdb (MDEV-31086).
While iterating the altered table fields, we fail to consider
the dropped columns.
This commit is contained in:
Thirunarayanan Balathandayuthapani 2023-08-08 12:06:21 +05:30
parent ab10a675ac
commit 0ede90dd31
3 changed files with 29 additions and 7 deletions
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7
mysql-test/suite/innodb/r/fk_col_alter.result
View file

@ -75,3 +75,10 @@ ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb4, ALGORITHM=COPY;
ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY (msg) REFERENCES t1(msg), aLGORITHM=INPLACE;
SET FOREIGN_KEY_CHECKS=1;
DROP TABLE t2, t1;
#
# MDEV-31869 Server aborts when table does drop column
#
CREATE TABLE t (a VARCHAR(40), b INT, C INT) ENGINE=InnoDB;
ALTER TABLE t MODIFY a VARCHAR(50), DROP b;
DROP TABLE t;
# End of 10.4 tests

8
mysql-test/suite/innodb/t/fk_col_alter.test
View file

@ -104,3 +104,11 @@ ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY (msg) REFERENCES t1(msg), aLGORITHM=IN
SET FOREIGN_KEY_CHECKS=1;
DROP TABLE t2, t1;
--echo #
--echo # MDEV-31869 Server aborts when table does drop column
--echo #
CREATE TABLE t (a VARCHAR(40), b INT, C INT) ENGINE=InnoDB;
ALTER TABLE t MODIFY a VARCHAR(50), DROP b;
DROP TABLE t;
--echo # End of 10.4 tests

21
storage/innobase/handler/handler0alter.cc
View file

@ -8330,14 +8330,21 @@ err_exit:
index columns are modified */
if (ha_alter_info->handler_flags
& ALTER_COLUMN_TYPE_CHANGE_BY_ENGINE) {
List_iterator<Create_field> it(
ha_alter_info->alter_info->create_list);
for (uint i = 0; i < table->s->fields; i++) {
Field* field = table->field[i];
Create_field *f= it++;
if (!f->field || field->is_equal(*f))
continue;
for (uint i= 0; i < table->s->fields; i++) {
Field* field = table->field[i];
for (const Create_field& new_field :
ha_alter_info->alter_info->create_list) {
if (new_field.field == field) {
if (!field->is_equal(new_field)) {
goto field_changed;
}
break;
}
}
continue;
field_changed:
const char* col_name= field->field_name.str;
dict_col_t *col= dict_table_get_nth_col(
m_prebuilt->table, i);