Aleksey Midenkov 76063c2a13 MDEV-20494 ER_NOT_FORM_FILE or assertion upon adding partition to period table ...

- Fixed mysql_prepare_create_table() constraint duplicate checking;
- Refactored period constraint handling in mysql_prepare_alter_table():
  * No need to allocate new objects;
  * Keep old constraint name but exclude it from dup checking by automatic_name;
- Some minor memory leaks fixed;
- Some conceptual TODOs.

2020-04-03 23:55:48 +03:00

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