How to avoid NULL check in JOIN condition in Tableau

I am trying to change backend DB for Tableau dashboard. Tableau is generating JOIN SQLs with conditions such as: ON a.col1 = b.col2 OR (a.col1 is null and b.col2 is null) Is there a way we can avoid having OR (a.col1 is null and b.col2 is null) condition? I tried ZN and IFNULL with the column name but still such conditions are getting added. The Druid DB supports JOIN only with equality condition and because of IS NULL check , the query is failing. Thanks


This is a companion discussion topic for the original entry at https://stackoverflow.com/questions/71150973/how-to-avoid-null-check-in-join-condition-in-tableau