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