[#2286] Distribution.java correct equals method.

[lokendra005]

What changes were proposed in this pull request?

This pull request addresses the issue with the equals method in Distribution.java. The equals method is updated to correctly override Object.equals(Object), ensuring it adheres to Java's best practices.

Why are the changes needed?

This pull request addresses the issue with the equals method in Distribution.java. The equals method is updated to correctly override Object.equals(Object), ensuring it adheres to Java's best practices.

Fix: #2286

Does this PR introduce any user-facing change?

NO

How was this patch tested?

This patch was tested using unit tests that verify the behavior of the equals.

[lokendra005]

@diqiu50 I have raised this new pull request this doesn't change the original behavior, kindly review.

[diqiu50]

@diqiu50 Can you compile the code successfully,

[diqiu50]

This equals method is primarily used to solve compare different instances of DistributionDTO and DistributionImpl. The equals are the best name. If everyone feels that this name is ambiguous, we can also change it.

You need to add some testers for it

[justinmclean]

It may be that this needs to be fixed?

/home/runner/work/gravitino/gravitino/api/src/main/java/org/apache/gravitino/rel/expressions/distributions/Distribution.java:60: warning: [cast] redundant cast to Distribution
    Distribution that = (Distribution) obj;

[lokendra005]

@justinmclean @diqiu50 can I make a separate class for distribution??

public class DistributionImpl implements Distribution {

@Override
public boolean equals(Object obj) {
    if (this == obj) {
        return true;
    }
    if (obj == null || getClass() != obj.getClass()) {
        return false;
    }

    Distribution that = (Distribution) obj;
    return number() == that.number()
        && strategy().equals(that.strategy())
        && Arrays.equals(expressions(), that.expressions());
}

}

[diqiu50]

@lokendra005 Can you update you code for review. You need add some tester for this changed. I expect you have some testers that compare difference object for Distribution