Re: pgbench - allow to store select results into variables

Hello again,

> I'd be okay with
>
> SELECT 1, 2 \into one two
> SELECT 3 \into three

Here is a v2 with more or less this approach, although \into does not end 
the query, but applies to the current or last sql command. A query is 
still terminated with a ";".

Now it handles things like :

   -- standard sql command
   SELECT balance FROM bank WHERE id=1;
   \into balance

   -- compound sql command, three == 3.
   SELECT 1, 2 \; SELECT 3 ;
   \into three

   -- compound query with 2 selects & 3 variables
   SELECT i \into one
     FROM generate_series(1, 1) AS i \;
   SELECT i+1, i+2 \into two three
     FROM generate_series(1, 1) AS i ;


I had to add a few lines in psql scanner to count "\;", so the parsing 
logic is a little more complicated than before.

-- 
Fabien.