Add implementation for load_with_datetime in Python package.

[zijie0]

Description

We would like to use load_with_datetime method implemented in Rust binding in our Python project. Add the implementation in Python package.

[zijie0]

Hmm... the test failed. Let me check it later.

[zijie0]

It's weird, the tests passed on my local machine:

In [1]: %load test.py

In [2]: # %load test.py
   ...: from deltalake import DeltaTable
   ...:
   ...:
   ...: table_path = "./rust/tests/data/simple_table"
   ...: dt = DeltaTable(table_path)
   ...: dt.load_with_datetime("2020-05-01T00:47:31-07:00")
   ...: assert dt.version() == 0
   ...: dt.load_with_datetime("2020-05-02T22:47:31-07:00")
   ...: assert dt.version() == 1
   ...: dt.load_with_datetime("2020-05-25T22:47:31-07:00")
   ...: assert dt.version() == 4
   ...:
   ...:

In [3]: dt.version()
Out[3]: 4

In [4]: dt.load_with_datetime("2020-05-04T22:47:31-07:00")

In [5]: dt.version()
Out[5]: 3

I'm not sure why it's failing in CI. Could @fvaleye @houqp take a look please?

[zijie0]

Learned from time_travel_by_ds test case, we should set delta log mtime before running the test. Problem solved.

[fvaleye]

@zijie0 Thank you for your PR, I added some comments!

[zijie0]

Thanks @fvaleye ! I will go through all the comments today.

[zijie0]

Hi @fvaleye , when I run make install it seems that the old version of deltalake is not removed and pip will give some message like: deltalake is already installed with the same version as the provided wheel. Use --force-reinstall to force an installation of the wheel.

So I added an uninstall step in Makefile, is that ok?

[houqp]

I think it makes sense to add a new uninstall makefile target. We could also update the install target to use --force-reinstall by default if that helps. Once PyO3/maturin#604 is resolved, we should probably switch to maturin develop for the install target so we won't need to manually pick up code change for local development.

[houqp]

Looks great to me, thank you @zijie0 !

[fvaleye]

Perfect👍
Thanks @zijie0