presto-parser/src/main/java/io/prestosql/sql/tree/SingleColumn.java/SingleColumn/equals
class SingleColumn:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        SingleColumn other = (SingleColumn) obj;
        return Objects.equals(this.alias, other.alias) && Objects.equals(this.expression, other.expression);
    }