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Sergei Petrunia authored
This is 11.0 part of the fix: in 11.0, get_costs_for_tables() calls best_access_path() for all possible tables, for each call it saves a POSITION object with the access method and "loose_scan_pos" POSITION object. The latter is saved even if there is no possible LooseScan plan. Saving is done by copying POSITION objects which may generate a spurious UBSan error.
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