Re: [Tarantool-patches] [PATCH v2 4/4] sql: introduce FINALIZE for custom aggregate

[Vladislav Shpilevoy via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

Thanks for the patch!

> Example:
> ```
> box.schema.func.create("F1_finalize", {
>     language = "Lua",
>     body = [[
>         function(state)
>             if state == nil then
>                 return 0
>             end
>             return state.sum / state.count
>         end
>     ]],
>     param_list = {"map"},
>     returns = "number",
>     exports = {'LUA', 'SQL'},
> })

I thought of another approach - let to call the function any name,
make {aggregate = "finalize", source = "F1"}. So it is like a foreign
key. But up to you whether you like it and whether you will try to bring
it up with the product managers.

> box.execute('SELECT f1(i) FROM t;')

The commit technically LGTM.