On 2/10/16 1:17 PM, Pavel Stehule wrote:


2016-02-10 20:10 GMT+01:00 Jim Nasby <jim.na...@bluetreble.com
<mailto:jim.na...@bluetreble.com>>:

    On 2/10/16 1:04 PM, Pavel Stehule wrote:


             BTW, if all that's desired here are session variables for
        plpgsql, I
             think it makes a lot more sense to start with implementing
             per-function session variables. That's a lot simpler
        design-wise and
             is something we should have anyway. You don't necessarily want

It is too simple and too like workaround :) I can do it this in plpgsql
extension probably.

I think it's something people will definitely want. If we don't have it, then they're going to be using schema variables as a work-around because they can't do a private static variable inside a single function.

    Most importantly, since this effects only plpgsql and only
    individual functions, the design is simple and should be easy to
    commit in 9.6. I don't have the same confidence with schema variables.


My target is not 9.6 - next commitfest will be full - finishing multi
CPU queries, logical replication, .. and I have still three opened
patches. But if we find a agreement in this spring, I can implement it
in summer, and it can be in upstream in early 9.7 commitfest. I know,
this topic is difficult, so have to start it now.

Sure. I think it would be useful to have a wiki page with info as it gets ironed out. A good starting point would be use cases. One that I don't think has been considered is different extensions adding/using different schema variables. Questions like should extension A have direct access to variables for extension B.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com


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