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From Kiran Ayyagari <kayyag...@apache.org>
Subject Re: Is the AndCursor useful ?
Date Thu, 16 Jun 2011 12:54:46 GMT
On Thu, Jun 16, 2011 at 6:14 PM, Emmanuel Lécharny <elecharny@apache.org> wrote:
> On 6/16/11 2:02 PM, Kiran Ayyagari wrote:
>>
>> On Thu, Jun 16, 2011 at 5:00 PM, Emmanuel Lecharny<elecharny@gmail.com>
>>  wrote:
>>>
>>> On 6/16/11 1:18 PM, Kiran Ayyagari wrote:
>>>>
>>>> On Thu, Jun 16, 2011 at 3:29 PM, Emmanuel Lecharny<elecharny@gmail.com>
>>>>  wrote:
>>>>>
>>>>> Hi guys,
>>>>>
>>>>> just wondering if we need to keep the intermediate AndCursor class ?
>>>>> All
>>>>> in
>>>>> all, when building the cursors, if we have a conjonction, we will pick
>>>>> the
>>>>> smallest cursor to store it as wrapped into the AndCursor, so I wonder
>>>>> if
>>>>> it's not a good idea to simply remove this cursor from the equation ?
>>>>>
>>>> I don't think so, we do need evaluators also
>>>
>>> What for ? Can't we use the underlying cursor's evaluator ?
>>>
>> yeap, agree, this indeed speeds up evaluation
>>
>> OTOH, I prefer to keep a hint about conjunction in the returned cursor
>> or we can also change AndCursor to not use evaluators
>> but just as a dumb wrapper (i.e new AndCursor(IndexCursor) )
>
> Hmmm, seems that the AndCursor also needs to evaluate candidate against the
> non selected indexes. Removing it will simply retruns too many entries.
>
> PS : Sorry if those seem stupid questions, I'm trying to get a key about
> this part of the code I don't know atm. Thanks for the responses.
>
not at all, got a chance to read this code after long time, and it is
worth the time spent.
> --
> Regards,
> Cordialement,
> Emmanuel Lécharny
> www.iktek.com
>
>



-- 
Kiran Ayyagari

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