postgres pipline query

[d4wae89d498]

Hello, 2 days ago, async-batch patch aka. pipline mode was added to postgresql master, this what allow ultra high performances for both lithium and drogon on techempower, excpect that they were using an old fork of libpq. Now that this feature is beeing added officially, maybe implementing it would be a good idea ?

See this commit postgres/postgres@acb7e4e

old doc about that feature : https://2ndquadrant.github.io/postgres/libpq-batch-mode.html

see drogon issue: drogonframework/drogon#526

Or maybe i'm wrong once again, let me know.

I can help you working on it.

Thank you really much for your super nice repo. Deserve more stars.

[eddic]

Yeah this would fit very nicely into the way fastcgi++ currently does it's PostgreSQL business. The Connection class implements it's own queue of sorts and this could effectively replace it. We'll leave this issue open as a reminder.