Segfault after removing a key column

[oleksiyskononenko]

import datatable as dt
DT = dt.Frame([[1], [2]])
DT.key = ["C0", "C1"]
del DT[0]
print(DT)

Produces Segmentation fault: 11 / Bus error: 10.

[st-pasha]

Should removing a key column throw an exception, or automatically "unkey" the frame?

[oleksiyskononenko]

"unkey" it automatically and do remove a column sounds like handling exception in one particular way. Who knows, may be a user would need something different in this case. Throwing an exception looks like more flexible solution.