Bug#12948130 UNNECESSARY X-LOCKING OF ADAPTIVE HASH INDEX (BTR_SEARCH_LATCH)
InnoDB acquires an x-latch on btr_search_latch for certain in-place updates that do affect the adaptive hash index. These operations do not really need to be protected by the btr_search_latch: * updating DB_TRX_ID * updating DB_ROLL_PTR * updating PAGE_MAX_TRX_ID * updating the delete-mark flag rb:750 approved by Sunny Bains
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