Fix CSVTab::next method.

src/vtab/csvtab.rs

@@ -146,12 +146,19 @@ impl VTabCursor<CSVTab> for CSVTabCursor {
         self.next()
     }
     fn next(&mut self) -> Result<()> {
+        {
             let vtab = self.vtab();
             if vtab.reader.done() {
                 return Err(Error::ModuleError(format!("eof")));
             }
-        unimplemented!();
-        // self.row_number = self.row_number + 1;
+
+            vtab.cols.clear();
+            while let Some(col) = vtab.reader.next_str().into_iter_result() {
+                vtab.cols.push(String::from(try!(col)));
+            }
+        }
+
+        self.row_number = self.row_number + 1;
         Ok(())
     }
     fn eof(&self) -> bool {