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[BUG] Default type of empty list for Index should be object dtype #14091

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galipremsagar opened this issue Sep 12, 2023 · 1 comment · Fixed by #14116
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[BUG] Default type of empty list for Index should be object dtype #14091

galipremsagar opened this issue Sep 12, 2023 · 1 comment · Fixed by #14116
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@galipremsagar
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bug Something isn't working Python Affects Python cuDF API.

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@galipremsagar
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galipremsagar commented Sep 12, 2023 •
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Describe the bug
When an empty list is passed to Index constructor cudf defaults to float64, whereas pandas defaults to object. We should match the same.

Steps/Code to reproduce bug

In [1]: import cudf

In [2]: cudf.Index([])
Out[2]: Float64Index([], dtype='float64')

In [3]: import pandas as pd

In [4]: pd.Index([])
Out[4]: Index([], dtype='object')

Expected behavior

In [4]: cudf.Index([])
Out[4]: StringIndex([], dtype='object')

Environment overview (please complete the following information)

  • Environment location: [Bare-metal]
  • Method of cuDF install: [from source]
@galipremsagar galipremsagar added bug Something isn't working Python Affects Python cuDF API. labels Sep 12, 2023
@galipremsagar galipremsagar self-assigned this Sep 12, 2023
@mroeschke
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Note that in 2.0, an empty pandas.Series also defaulted to object

@galipremsagar galipremsagar mentioned this issue Sep 18, 2023
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rapids-bot bot pushed a commit that referenced this issue Sep 20, 2023
@galipremsagar
Fix type of empty Index and raise warning in Series constructor (#…
f7ca051 
…14116)

Fixes: #14091 
This PR fixes empty inputs dtype in `Index` to default to `str` instead of `float64`. Another change is there is a deprecation warning for `Series` constructor to match pandas.

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - Bradley Dice (https://github.com/bdice)

URL: #14116
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@galipremsagar galipremsagar

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bug Something isn't working Python Affects Python cuDF API.
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cuDF/Dask/Numba/UCX
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Fix type of empty Index and raise warning in Series constructor galipremsagar/cudf
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@mroeschke @galipremsagar