What's the data flow between Pgpool, Postgresql and client I'm new in Pgpool.

I want to ask the question, what is the dataflow between Pgpool, Postgresql when client querying data

1/ 


Client query data to Pgpool, 
PgPool ask Postgresql
Postgresql calculate result, return data to PgPool
PgPool transfer data to Client


2/ 


Client query data to PgPool 
PgPool ask Postgresql
Client and Postgresql make a connection 
Postgresql calculate result, 
Postgresql directly transfer data to Client


3/ Other schema ?

Could you please show me the right answer 

Many thanks
Pgpool is a kind of a layer between client and postgresql. Pgpool receive a query from client and ask Postgresql for data. Postgresql answers to Pgpool and pgpool send data to client like on the picture below. There is not direct connection between client and Postgres when you use Pgpool to connect to database. By the way Pgpool provides connection pooling, replication, load balance, connection limits and paralell query so it's quite nice to use with PGSQL



Manual: http://www.pgpool.net/docs/latest/pgpool-en.html