Describe the bug
Table validation returns an error when attempting to save a summary rule where result contains a timespan column.
To Reproduce
Attempt to create a summary rule with a query that returns a timespan column, for example:
print X = timespan(0)
| summarize by X
Upon saving the rule, error is received:
Table validation failed with following 1 errors: MSG 1015: Invalid value provided for data type: timespan, in column X
Expected behavior
No error is expected.