Don't write rows in MyISAM tables when using count(distinct)

Don't read MyISAM header when running without locking

1 files changed, 8 insertions, 5 deletions

diff --git a/myisam/mi_locking.c b/myisam/mi_locking.c
index e067e80fcf3..8ef5db1d344 100644
--- a/myisam/mi_locking.c
+++ b/myisam/mi_locking.c
@@ -412,11 +412,14 @@ int _mi_mark_file_changed(MI_INFO *info)
       share->global_changed=1;
       share->state.open_count++;
     }
-    mi_int2store(buff,share->state.open_count);
-    buff[2]=1;					/* Mark that it's changed */
-    return (my_pwrite(share->kfile,buff,sizeof(buff),
-		      sizeof(share->state.header),
-		      MYF(MY_NABP)));
+    if (!share->temporary)
+    {
+      mi_int2store(buff,share->state.open_count);
+      buff[2]=1;				/* Mark that it's changed */
+      return (my_pwrite(share->kfile,buff,sizeof(buff),
+			sizeof(share->state.header),
+			MYF(MY_NABP)));
+    }
   }
   return 0;
 }