my_malloc calls made when doing a normal PK lookup SELECT query
get_lock_data
Called from sql_lock.lock_tables.open_and_lock_tables
From Mikael:
get_lock_data
My notes are a bit unclear exactly when the second call comes, but
I think it is in unlock_tables phase. Seems like get_lock_data
allocates some short-time memory both for lock/unlock
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