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From Mike Carey <dtab...@gmail.com>
Subject Re: Retain inputs on index-search
Date Fri, 16 Sep 2016 18:21:58 GMT
Ditto...

On Sep 16, 2016 11:15 AM, "Yingyi Bu" <buyingyi@gmail.com> wrote:

> I'd like to join the discussion.
>
> Best,
> Yingyi
>
>
>
> On Fri, Sep 16, 2016 at 10:47 AM, Steven Jacobs <sjaco002@ucr.edu> wrote:
>
>> Hi,
>> I have come across an issue where retainInputs is always set to false
>> when creating an index search in the select case. This was because it was
>> previously assumed that variables before the search don't need to be kept
>> after the search. In the nonPure case, this assumption is wrong. I'm now
>> looking at two possible solution:
>>
>> 1) Add specialization for nonPure cases to set retainInputs to true
>> 2) Always set retainInputs to true. This has performance implications, as
>> well as plan changes, since now a project will be added above the index
>> search in most cases, and the index search operator will have extra fields
>> attached to it's tuples (although in general this will be only single
>> values).
>>
>> I wanted to meet with whoever is interested, to decide the best way to
>> address this. If you are interested in joining the meeting, please reply.
>> For now I'll tentatively set the meeting for Tuesday at 11 AM.
>>
>> Steven
>>
>
>

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