bk commit into 5.0 tree (sergefp:1.2011)

[Sergey Petrunia]

Below is the list of changes that have just been committed into a local
5.0 repository of psergey. When psergey does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet
  1.2011 05/11/25 20:48:26 sergefp@stripped +1 -0
  Merge spetrunia@stripped:/home/bk/mysql-5.0
  into mysql.com:/home/psergey/mysql-5.0-bug15204

  sql/opt_range.cc
    1.200 05/11/25 20:48:24 sergefp@stripped +0 -0
    Auto merged

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	sergefp
# Host:	newbox.mylan
# Root:	/home/psergey/mysql-5.0-bug15204/RESYNC

--- 1.199/sql/opt_range.cc	2005-11-24 19:50:01 +03:00
+++ 1.200/sql/opt_range.cc	2005-11-25 20:48:24 +03:00
@@ -3136,10 +3136,10 @@
     /* F=F-covered by first(I) */
     bitmap_union(&covered_fields, &(*ror_scan_mark)->covered_fields);
     all_covered= bitmap_is_subset(&param->needed_fields, &covered_fields);
-  } while (!all_covered && (++ror_scan_mark < ror_scans_end));
-
-  if (!all_covered)
-    DBUG_RETURN(NULL); /* should not happen actually */
+  } while ((++ror_scan_mark < ror_scans_end) && !all_covered);
+  
+  if (!all_covered || (ror_scan_mark - tree->ror_scans) == 1)
+    DBUG_RETURN(NULL);
 
   /*
     Ok, [tree->ror_scans .. ror_scan) holds covering index_intersection with