While we (Cloudera) do not technically support Solaris, the Impala ODBC 2.5 driver we ship is an OEM version of the Simba Impala ODBC driver (http://bit.ly/1lfJOH3) which does claim to support additional operating systems. Specifically, Simba claims support for Solaris, AIX, Mac OS X, and HP-UX on top of the OSes we directly support. Note that Cloudera has not confirmed this, and that there may be additional caveats, but it may work for you. If you do try it, let us know how it works out for you! Thanks!
Eric Sammer Engineering Manager / Cloudera / @esammer