[#821] Optimise ResultQuery.fetchAny() executing fetchLazy() internally, and only fetching one record from the cursor

jOOQ/src/main/java/org/jooq/impl/AbstractResultQuery.java

@@ -214,14 +214,14 @@ abstract class AbstractResultQuery<R extends Record> extends AbstractQuery imple
 
     @Override
     public final R fetchAny() throws SQLException {
-        // TODO: restrict ROWNUM = 1
-        Result<R> r = fetch();
+        Cursor<R> c = fetchLazy();
 
-        if (r.size() > 0) {
-            return r.get(0);
+        try {
+            return c.fetchOne();
+        }
+        finally {
+            c.close();
         }
-
-        return null;
     }
 
     @Override