A WHERE clause condition that uses NOT IN with a subquery will have unexpected results if that subquery returns
NULL. On the other hand NOT EXISTS subqueries work reliably under the same conditions.
This rule raises an issue when NOT IN is used with a subquery where the selected column is nullable.
Noteworthy
This rule raises issues only when a Data Dictionary is provided during the analysis. See https://docs.sonarqube.org/latest/analysis/languages/plsql/
