MetadataQueryComponent component = new MetadataQueryComponent();
Map<String, Object> map = new HashMap<String, Object>();
map.put( "domain", "JDBCDOMAIN" );
component.setInputs( map );
component.setQuery( mql );
component.execute();
IPentahoResultSet rs = component.getResultSet();
try {
Assert.assertNotNull( rs );
Assert.assertEquals( 1, rs.getColumnCount() );