On 2/10/16 11:25 AM, Pavel Stehule wrote:
Oh, and I suggest we call them SESSION variables rather than SCHEMA variables, to reinforce the idea of how long the values in the variables live. A session variable is in a sense a 1x1 temp table, whose definition persists across sessions but whose value does not. I didn't propose SESSION variables - now there are some workarounds how to anybody can emulate it, so this feature can wait. What we need is safe session variables with limited access. And the border can be defined by schema scope. So the keyword SCHEMA has sense, and it is necessary.
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 session variables to be schema-level. (I realize the other PLs make them global, which is even worse, but that's no reason to continue that path.)
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