ENH/CoW: use lazy copy in set_index method #49557
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Copy-on-Write in
set_indexThis PR is part of an effort to implement the Copy-on-Write implementation mentioned in ENH / CoW: Use the "lazy copy" (with Copy-on-Write) optimization in more methods where appropriate #49473. More detail in this proposal https://docs.google.com/document/d/1ZCQ9mx3LBMy-nhwRl33_jgcvWo9IWdEfxDNQ2thyTb0/edit / with discussions in Proposal for future copy / view semantics in indexing operations #36195