A bug in table view sorting in version 0.20.0?

[vnnw]

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• I have checked the superset logs for python stacktraces and included it here as text if any
• I have reproduced the issue with at least the latest released version of superset
• I have checked the issue tracker for the same issue and I haven't found one similar

Superset version

0.20.0 from pypi

Expected results

Order by time column exactly.

Actual results

Sorting is wrong when I choose the format of "%Y-%m-%d | 2019-01-14" using the sample database of "birth names".
The line of "1970-01-01" comes to the first place.
Using other datetime formats seems good as far as I tested.

See the screenshot as below:

Steps to reproduce

Create a table view, select "Include Time", then click Sort icon on the table's header.

[mistercrunch]

Looks like something around 0 or NULL getting processed as epoch 0.

[mistercrunch]

Notice: this issue has been closed because it has been inactive for 206 days. Feel free to comment and request for this issue to be reopened.