Sergei Golubchik 0fcc3abf4a MDEV-22180 Planner opens unnecessary tables when updated table is referenced by foreign keys ...

only MDL-prelock but do not open FK child tables for read-only (RESTRICT)
FK actions.

Tables still needs to be opened for CASCADE actions, see 9180e8666b

2020-05-06 20:24:48 +02:00

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