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Copy on write using weakrefs#11500

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nickeubank wants to merge 9 commits intopandas-dev:masterpandas-dev/pandas:masterfrom

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Commits on Nov 20, 2015

• Basic working implementation

  

  Nick Eubank

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  f35187a

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• now keeps columns as views

  

  Nick Eubank

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  90ff5ea

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• check for dead weakrefs

  

  Nick Eubank

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  4c9e5a9

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• store children in weakValueDictionary instead of list

  

  Nick Eubank

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  0260b91

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• Remove redundant copying

  

  Nick Eubank

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  8cf0bbd

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• Add back reference to origin df to protect against broken chains of views

  

  Nick Eubank

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  b41ef8f

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• make _is_view more conservative on multi-block objects

  Show description for 1814085
  

  Nick Eubank

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  1814085

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Commits on Dec 4, 2015

• fix multi-index behavior

  

  Nick Eubank

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  d62b9fa

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• fix test_merge

  

  Nick Eubank

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  fba6993

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