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MDEV-17933 slow server status - dict_sys_get_size()
dict_sys_get_size(): Replace the time-consuming loop with a crude estimate that can be computed without holding any mutex. Even before dict_sys->size was removed in MDEV-13325, not all memory allocations by the InnoDB data dictionary cache were being accounted for. One example is foreign key constraints. Another example is virtual column metadata, starting with 10.2.
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