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Incorrect join of DataFrames with non-unique datetime indices #1306
I'm not sure whether joining of DFs with non-unique indices is now supported, but it's not giving an error and this simple example don't make sense:
Shouldn't the 1st row of df1 join to both rows of df2?
I worked through this and built the many-to-one and many-to-many join machinery today for indexes. Was not easy:
The matter of the timestamp handling is something separate, so closing this issue