[t:4169] adding engine status variable to count leaf node merges missed by...

[t:4169] adding engine status variable to count leaf node merges missed by cleaner thread (handlerton piece)

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@37930 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/hatoku_hton.cc

@@ -1293,6 +1293,7 @@ static bool tokudb_show_engine_status(THD * thd, stat_print_fn * stat_print) {
       SHOWVAL(cleaner_max_buffer_workdone);
       SHOWVAL(cleaner_min_buffer_workdone);
       SHOWVAL(cleaner_total_buffer_workdone);
+      SHOWVAL(cleaner_num_leaves_unmerged);
       SHOWVAL(flush_total);
       SHOWVAL(flush_in_memory);
       SHOWVAL(flush_needed_io);