Requirement

• Text : there is no particular requirement.
• Date : there is no particular requirement, but it must be a parseable date.
• Number : Your scripted field must be a Double object.

see the following exemple for reference

Configure the Scripted Field Template

Configure the template for your Scripted Field in the Administration Page (GRV Scripted Fields documentation) :

Result

Here are the result with the above configuration:

Here are the jql and issue view with the above configuration:

Error

if your date field value is not a parseable java Date or if your number field object is not a Double you will only have 'none' in your statistic

If your Number is not cast to Double , you will have the folowing kind of error message :