1 files changed, 7 insertions, 0 deletions
diff --git a/storage/myisam/myisamdef.h b/storage/myisam/myisamdef.h
index 36328c9d9f1..6ccb52aff22 100644
--- a/storage/myisam/myisamdef.h
+++ b/storage/myisam/myisamdef.h
@@ -298,7 +298,14 @@ typedef struct st_mi_sort_param
   pthread_t  thr;
   IO_CACHE read_cache, tempfile, tempfile_for_exceptions;
   DYNAMIC_ARRAY buffpek;
+  
+  /* 
+    The next two are used to collect statistics, see update_key_parts for
+    description.
+  */
   ulonglong unique[MI_MAX_KEY_SEG+1];
+  ulonglong notnull[MI_MAX_KEY_SEG+1];
+
   my_off_t pos,max_pos,filepos,start_recpos;
   uint key, key_length,real_key_length,sortbuff_size;
   uint maxbuffers, keys, find_length, sort_keys_length;