Github user raghavgautam commented on the issue:
https://github.com/apache/spark/pull/22414
The problem is that the error message that we start getting is:
```
requirement failed: The window duration must be positive, but found:
-1209600000000
```
Where as the error that I would expect is:
```
requirement failed: The window duration must be a positive integer, long or
string literal, found: -2 week
```
By looking at -1209600000000 it's not clear that source of problem is -2
week.
However it does simplify the code. If this is acceptable please commit your
patch.
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