[Improvement] In Distribution.java correct equals method

### What would you like to be improved?

The Object class contains an equals method, a method called equals should in general override Object.equals(Object).

### How should we improve?

A method called equals should override Object.equals(Object) or that is not its intent it should be renamed.

Start by locating Distribution.java and reading the existing equals method and its callers. Determine whether the method is intended to override Object.equals(Object) or should be renamed, then inspect the relevant tests or run the project test suite. Done means the method's intent is unambiguous and the affected behavior is covered without regressions.

Written by the indexing model from the issue text.