Connection pooling

[JelleVE]

I might have missed it, but I couldn't find anything in the documentation/issues: is connection pooling (through unixodbc) supported?
I am currently testing this through looping a simple query. Enabling pooling seems to have a positive effect on the speed with which the queries are being executed, but the number of active connections (as counted by the query below) doesn't increase above one.

SELECT
      s.login_name
    , s.host_name
    , s.program_name
    , s.host_process_id
    , COUNT(*) AS connection_count
FROM sys.dm_exec_sessions AS s
GROUP BY
      s.login_name
    , s.host_name
    , s.program_name
    , s.host_process_id;