[BUG REPORT] Transaction registers closes early

[hhsecond]

Describe the bug
In case of multiple columns, if we open only few of such columns in context manager and still tries to write on other columns inside the context manager, transactions get False. A sample script to reproduce is given below

Severity

Select an option:

• Data Corruption / Loss of Any Kind
• Unexpected Behavior, Exceptions or Error Thrown
• Performance Bottleneck

To Reproduce

from hangar import Repository
import numpy as np


repo = Repository('.')
repo.init(user_name='me', user_email='a@b.c', remove_old=True)
co = repo.checkout(write=True)
co.add_ndarray_column('x', prototype=np.array([1]))
co.add_ndarray_column('y', prototype=np.array([1]))
co.commit('added columns')
co.close()

co = repo.checkout(write=True)
x = co.columns['x']
y = co.columns['y']


with x:  # note that we are opening only `x` in the CM
    for i in range(10):
        y[i] = np.array([i])  # but we are trying to update `y` column
        x[i] = np.array([i])
co.commit('adding file')
co.close()

Desktop (please complete the following information):

• OS: Ubuntu 19.10
• Python: 3.7
• Hangar: 0.5.1.dev0 (master, at the time of writing)

[rlizzo]

Thanks for the report! I'll dig in asap

[hhsecond]

Sure, I tried to spend some time but happy to take another look in a bit, in case you are tied up