Cannot convert null literal to non-nullable reference type.

Nullability of reference types in type of parameter 'x' of 'bool QueryComparer.Equals(IQuery x, IQuery y)' doesn't match implicitly implemented member 'bool IEqualityComparer<IQuery>.Equals(IQuery? x, IQuery? y)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'y' of 'bool QueryComparer.Equals(IQuery x, IQuery y)' doesn't match implicitly implemented member 'bool IEqualityComparer<IQuery>.Equals(IQuery? x, IQuery? y)' (possibly because of nullability attributes).

The member 'QueryList.Count()' does not hide an accessible member. The new keyword is not required.

Non-nullable property 'Context' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable field 'QueryParameter' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable property 'Children' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'ParentQueryResultType' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'Queries' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.