title: GCP Datafusion oracle connectivity issues
body: <p>We're currently having issues setting up a connection to oracle datasources in datafusion (via jdbc) and i'm not sure if i am missing something.
  Bit of a background, we had issues connecting to any data source initially so in gcp i setup a vm instance to act as a proxy server (due to it being a private datafusion instance) and used iptables to register the connections.</p>
  <p>After this i can successfully connect to sql server datasources, on the vm instance i can ping and telnet all oracle and sql datasources.</p>
  <p>Network connectivity tests show datafusion can connect to the proxy and also that the proxy can hit datasources on-prem.</p>
  <p>The following pics are of my connection to oracle under namespace admin in datafusion</p>
  <p><a href="https://i.stack.imgur.com/GMkNm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GMkNm.png" alt="enter image description here" /></a>
  <a href="https://i.stack.imgur.com/BZB4w.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BZB4w.png" alt="enter image description here" /></a></p>
  <p>The ip address is of the proxy instance and the port is what was assigned in the iptable entry
  Again this works for sql server. Our datateam can connect to these datasources via bigquery using odbc, but it looks like you cannot use that connection type in datafusion.</p>