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0f08df4068
Consistently prevent nbtree array advancement from treating a scankey as
required when operating in pstate.forcenonrequired mode. Otherwise, we
risk a NULL pointer dereference. This was possible in the path where
_bt_check_compare is called to recheck a tuple that advanced all of the
scan's arrays to matching values: its continuescan=false handling
expects _bt_advance_array_keys to have been called with a valid pstate,
but it'll always be NULL during sktrig_required=false calls (which is
how _bt_advance_array_keys must be called when pstate.forcenonrequired).
Oversight in commit
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