This test works if uncommented except for hsql where the NULLs come back as 0 instead of Long.MIN_VALUE.
This test should be enabled with an (! isHSQL()) condition, 
or BETTER validateTableOfLongs when it sees an expected Long.MIN_VALUE should be relaxed a little to match EITHER that exact value OR a wasNull() check even if the value does not match.
Really, the hsql backend processor that loads an hsql result set into a VoltTable should be making that VoltTable more "realistic" by patching null columns with the correctly typed MIN_VALUE (logged this as ENG-5998).