[Bug-Fix] Fix partition cache match bug (#5060)

When partition cache is not cached continuely, range query may fail.
For example, partition key 20201011 and 20201013 is cached,
but rang query is between 20201011 and 20201013, the query will not hit the cache.
issue:#5059

be/src/runtime/cache/result_node.cpp

@@ -207,6 +207,7 @@ PCacheStatus ResultNode::fetch_partition(const PFetchCacheRequest* request,
                 end_it = part_it;
                 param_idx++;
                 part_it++;
+                find = false;
             } else {
                 status = PCacheStatus::DATA_OVERDUE;
                 break;