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7ae0be25a6
MDEV-16210 original case was wrongly allowed versioned DELETE from referenced table where reference is by non-primary key. InnoDB UPDATE has optimization for new rows not changing its clustered index position. In this case InnoDB doesn't update all secondary indexes and misses the one holding the referenced key. The fix was to disable this optimization for versioned DELETE. In case of versioned DELETE we forcely update all secondary indexes and therefore check them for constraints. But the above fix raised another problem with versioned DELETE on foreign table side. In case when there was no corresponding record in referenced table (illegal foreign reference can be done with "set foreign_key_checks=off") there was spurious constraint check (because versioned DELETE is actually UPDATE) and hence the operation failed with constraint error. MDEV-16210 tried to fix the above problem by checking foreign table instead of referenced table and that at least was illegal. Constraint check is done by row_ins_check_foreign_constraint() no matter what kind of table is checked, referenced or foreign (controlled by check_ref argument). Referenced table is checked by row_upd_check_references_constraints(). Foreign table is checked by row_ins_check_foreign_constraints(). Current fix rolls back the wrong fix for the above problem and disables referenced table check for DELETE on foreign side by introducing `check_foreign` argument which when set to *false* skips row_ins_check_foreign_constraints() call. |
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