EHN: FeatureUnion
would merge all into one DataFrame and the index would use the common part
#433
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Two or more Series/DataFrame data merge, should consider the index.
The indexes are the same that would be fine.
The indexes aren't different that would have a few problems.
The
reindex
method isn't right if the index has meaningful it could be ID.And
stack
them asndarray
, that would be pitiful.