JQL "ORDER BY Desc" place null at the highest order

Summary

When running JQL ORDER BY Desc, JIRA places the issue with null value for that field at the highest order, instead of at the lower order

Steps to Reproduce

1. Having 3 issues with value for a custom field as 1, 2, and null
2. Run JQL query: ORDER BY <cusom_field> Desc

Expected Result

JIRA should order the issues as follows:
2
1
null

Actual Result

JIRA places the null value at the highest rank
null
2
1