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as_parent_map = dict((node.key, node.parent_keys)
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for node in viewvalues(self._nodes)
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# We intentionally always generate revnos and never force the
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# Strip the sequence_number that merge_sort generates
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return [_MergeSortNode(key, merge_depth, revno, end_of_merge)
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for _, key, merge_depth, revno, end_of_merge
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def get_parent_keys(self, key):
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"""Get the parents for a key
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Returns a list containg the parents keys. If the key is a ghost,
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None is returned. A KeyError will be raised if the key is not in
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:param keys: Key to check (eg revision_id)
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:return: A list of parents