@Override
    public O apply(I i) {
      for (var condition : children) {
        var result = condition.apply(i);
        if (result != null) {
          return result;
        }
      }
      return null;
    }
An expression that returns the first non-null result of evaluating each child expression.
planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/expression/ConfigExpression.java