presto-parser/src/main/java/io/prestosql/sql/tree/Cube.java/Cube/equals
class Cube:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Cube cube = (Cube) o;
        return Objects.equals(columns, cube.columns);
    }