Helper function to update the parent pointer of a node. @param tid - the transaction id @param dirtypages - the list of dirty pages which should be updated with all new dirty pages @param pid - id of the parent node @param child - id of the child node to be updated with the parent pointer @throws D
(TransactionId tid, HashMap<PageId, Page> dirtypages, BTreePageId pid, BTreePageId child)
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