`df_equals` testing util does not check that dtypes are equal

[RehanSD]

System information

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04):
• Modin version (modin.__version__):
• Python version:
• Code we can use to reproduce:

Describe the problem

The df_equals testing utility which compares two dataframes to ensure equality does not check dtypes - allowing cases like the following to succeed, when they should error out:

>>> pandas_df
   A  B
0  1  2
1  3  4
>>> modin_df
     A    B
0  1.0  2.0
1  3.0  4.0
>>> df_equals(modin_df, pandas_df)
# Should raise assertion error, but passes instead

Epic

This issue is an epic, here are actual tasks:

• https://github.com/modin-project/modin/issues/5956
• https://github.com/modin-project/modin/issues/5959
• https://github.com/modin-project/modin/issues/5960
• https://github.com/modin-project/modin/issues/5961
• https://github.com/modin-project/modin/issues/5962
• https://github.com/modin-project/modin/issues/5963
• https://github.com/modin-project/modin/issues/5964
• https://github.com/modin-project/modin/issues/5965
• https://github.com/modin-project/modin/issues/5966
• https://github.com/modin-project/modin/issues/5967
• https://github.com/modin-project/modin/issues/5968
• https://github.com/modin-project/modin/issues/5969
• https://github.com/modin-project/modin/issues/5970
• https://github.com/modin-project/modin/issues/5971
• https://github.com/modin-project/modin/issues/5972
• https://github.com/modin-project/modin/issues/5973
• https://github.com/modin-project/modin/issues/5974

[devin-petersohn]

@Garra1980 I think this needs to be high priority. We will need a lot of efforts to correct some of these.

[Garra1980]

@devin-petersohn agree, let's try to cleanup everything in the upcoming release

[Garra1980]

we can create or convert this issue into epic and track all problems there

[devin-petersohn]

Let's make this an epic