Re: default opclass for jsonb (was Re: Call for GIST/GIN/SP-GIST opclass documentation)

From: Oleg Bartunov <obartunov(at)gmail(dot)com>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Greg Stark <stark(at)mit(dot)edu>, Bruce Momjian <bruce(at)momjian(dot)us>, Gavin Flower <GavinFlower(at)archidevsys(dot)co(dot)nz>, "David E(dot) Wheeler" <david(at)justatheory(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: default opclass for jsonb (was Re: Call for GIST/GIN/SP-GIST opclass documentation)
Date: 2014-05-10 21:03:24
Message-ID: CAF4Au4wVcdsGLQOnzib3NoiJPF7seC9ydR4e6XVV_9D0WUgNWA@mail.gmail.com
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+1
but bit confused with json instead of jsonb

On Sun, May 11, 2014 at 1:00 AM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
>
> On 05/10/2014 04:42 PM, Heikki Linnakangas wrote:
>>
>>
>>
>> The main difference between the two opclasses from a user's standpoint is
>> not whether they hash or not. The big difference is that one indexes
>> complete paths from the root, and the other indexes just the "leaf" level.
>> For example, if you have an object like '{"foo": {"bar": 123 } }', one will
>> index "foo", "foo->bar", and "foo->bar->123" while the other will index
>> "foo", "bar" and "123".
>>
>> Whether the opclasses use hashing to shorten the key is an orthogonal
>> property, and IMHO not as important. To reflect that, I suggest that we name
>> the opclasses:
>>
>> json_path_ops
>> json_value_ops
>>
>> or something along those lines.
>>
>>
>
>
> That looks like the first suggestion I've actually liked and that users will
> be able to understand.
>
> cheers
>
> andrew
>
>
>
>
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