diff options
Diffstat (limited to 'innobase/row/row0ins.c')
| -rw-r--r-- | innobase/row/row0ins.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/innobase/row/row0ins.c b/innobase/row/row0ins.c index 1a616b74756..611f5cd30d1 100644 --- a/innobase/row/row0ins.c +++ b/innobase/row/row0ins.c @@ -678,16 +678,17 @@ row_ins_foreign_check_on_constraint( } } - /* We do not allow cyclic cascaded updating of the same - table. Check that we are not updating the same table which - is already being modified in this cascade chain. We have to - check this because the modification of the indexes of a - 'parent' table may still be incomplete, and we must avoid - seeing the indexes of the parent table in an inconsistent - state! In this way we also prevent possible infinite - update loops caused by cyclic cascaded updates. */ - - if (!cascade->is_delete + /* We do not allow cyclic cascaded updating of the same table, except + in the case the update is the action of ON DELETE SET NULL, which + cannot lead to an infinite cycle. Check that we are not updating the + same table which is already being modified in this cascade chain. We + have to check this because the modification of the indexes of a + 'parent' table may still be incomplete, and we must avoid seeing the + indexes of the parent table in an inconsistent state! In this way we + also prevent possible infinite update loops caused by cyclic cascaded + updates. */ + + if (!node->is_delete && row_ins_cascade_ancestor_updates_table(cascade, table)) { /* We do not know if this would break foreign key |