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.