From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: proposal: searching in array function - array_position |
Date: | 2015-01-28 07:15:12 |
Message-ID: | CAFj8pRC63RFJ-UhjrwkHekwtbVQ43A7FEQWMUCXoQAM=Vk0teQ@mail.gmail.com |
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Lists: | pgsql-hackers |
2015-01-28 0:01 GMT+01:00 Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>:
> On 1/27/15 4:36 AM, Pavel Stehule wrote:
>
>> 2015-01-26 23:29 GMT+01:00 Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com <mailto:
>> Jim(dot)Nasby(at)bluetreble(dot)com>>:
>>
>> On 1/26/15 4:17 PM, Pavel Stehule wrote:
>>
>> Any way to reduce the code duplication between the array and
>> non-array versions? Maybe factor out the operator caching code?
>>
>>
>> I though about it - but there is different checks, different
>> result processing, different result type.
>>
>> I didn't find any readable and reduced form :(
>>
>>
>> Yeah, that's why I was thinking specifically of the operator caching
>> code... isn't that identical? That would at least remove a dozen lines...
>>
>>
>> It is only partially identical - I would to use cache for array_offset,
>> but it is not necessary for array_offsets .. depends how we would to modify
>> current API to support externally cached data.
>>
>
> Externally cached data?
Some from these functions has own caches for minimize access to typcache
(array_map, array_cmp is example). And in first case, I am trying to push
these information from fn_extra, in second case I don't do it, because I
don't expect a repeated call (and I am expecting so type cache will be
enough).
I plan to do some benchmark to calculate if we have to do, or we can use
type cache only.
Pavel
>
> --
> Jim Nasby, Data Architect, Blue Treble Consulting
> Data in Trouble? Get it in Treble! http://BlueTreble.com
>
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