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union_cols does a cartesian product by row key #5993

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tpoterba opened this issue Apr 30, 2019 · 0 comments · Fixed by #6228
Closed

union_cols does a cartesian product by row key #5993

tpoterba opened this issue Apr 30, 2019 · 0 comments · Fixed by #6228

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@tpoterba
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@tpoterba tpoterba commented Apr 30, 2019

Example from Zulip:

mt_one.count()
# (239279, 153)
mt_two.count()
# (522049, 188)
mt_merge = mt_one.union_cols(mt_two)
mt_merge.count()
(242190, 341)

We should warn or error in this case.

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