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According to the standard, the autoincrement column (i.e. *identity column*) should be advanced each insert implicitly made by UPDATE/DELETE ... FOR PORTION. This is very unconvenient use in several notable cases. Concider a WITHOUT OVERLAPS key with an autoinc column: id int auto_increment, unique(id, p without overlaps) An update or delete with FOR PORTION creates a sense that id will remain unchanged in such case. The standard's IDENTITY reminds MariaDB's AUTO_INCREMENT, however the generation rules differ in many ways. For example, there's also a notion autoincrement index, which is bound to the autoincrement field. We will define our own generation rule for the PORTION OF operations involving AUTO_INCREMENT: * If an autoincrement index contains WITHOUT OVERLAPS specification, then a new value should not be generated, otherwise it should. Apart from WITHOUT OVERLAPS there is also another notable case, referred by the reporter - a unique key that has an autoincrement column and a field from the period specification: id int auto_increment, unique(id, s), period for p(s, e) for this case, no exception is made, and the autoincrementing rules will be proceeded accordung to the standard (i.e. the value will be advanced on implicit inserts). |
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