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Posted to derby-dev@db.apache.org by Nirmal Fernando <ni...@gmail.com> on 2010/04/24 08:40:08 UTC

Checking whether the two "expressions" are equal

Hi All,

I am in a trouble of finding where is the value/s used in an expression (eg:
j*2 i.e. value is 2) stored. If I expand this (j*2) value node, I can see
the operator used as '*' or times, but not the value.

If any of you can tell me the place where 'the value' is stored, that would
be really helpful.

Thank you very much.

-- 
Best Regards,
Nirmal

C.S.Nirmal J. Fernando
Department of Computer Science & Engineering,
Faculty of Engineering,
University of Moratuwa,
Sri Lanka.

Re: Checking whether the two "expressions" are equal

Posted by Nirmal Fernando <ni...@gmail.com>.

Thanks Bryan, I will look into that.



On Sat, Apr 24, 2010 at 8:14 PM, Bryan Pendleton
<bp...@gmail.com> wrote:
> Nirmal Fernando wrote:
>>
>> I am in a trouble of finding where is the value/s used in an expression
>> (eg: j*2 i.e. value is 2) stored. If I expand this (j*2) value node, I can
>> see the operator used as '*' or times, but not the value.
>
> I think you should see that '*' becomes a BinaryArithmeticOperatorNode,
> with two children: the left operand should be a ColumnReference, while
> the right operand should be a NumericConstantNode.
>
> The NumericConstantNode should be the data structure holding the
> constant value '2'.
>
> thanks,
>
> bryan
>



-- 
Best Regards,
Nirmal

C.S.Nirmal J. Fernando
Department of Computer Science & Engineering,
Faculty of Engineering,
University of Moratuwa,
Sri Lanka.

Re: Checking whether the two "expressions" are equal

Posted by Bryan Pendleton <bp...@gmail.com>.

Nirmal Fernando wrote:
> I am in a trouble of finding where is the value/s used in an expression 
> (eg: j*2 i.e. value is 2) stored. If I expand this (j*2) value node, I 
> can see the operator used as '*' or times, but not the value.

I think you should see that '*' becomes a BinaryArithmeticOperatorNode,
with two children: the left operand should be a ColumnReference, while
the right operand should be a NumericConstantNode.

The NumericConstantNode should be the data structure holding the
constant value '2'.

thanks,

bryan