GH28301 check for non-unique index in stack_multi_columns #28336
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jreback
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Sep 7, 2019
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Also pls add a whatsnew note (1.0 reshape bug)
jreback
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Sep 10, 2019
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thanks @christopherzimmerman nice patch! |
proost
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proost
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black pandasgit diff upstream/master -u -- "*.py" | flake8 --diffThe old implementation used
arangeto generate codes for a non-multiindex, which ended up creating bad codes if the index was not unique. The fix is just a straightforward factorize.