bk commit into 5.0 tree (sergefp:1.2300) BUG#24056

[Sergey Petrunia]

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ChangeSet@stripped, 2006-11-08 02:26:50+03:00, sergefp@stripped +1 -0
  BUG#24056: Crash in subquery:
  Don't assume that condition that was pushed down into subquery has 
  produced exactly one KEY_FIELD element - it could produce several or
  none at all, handle all of those cases.

  sql/sql_select.cc@stripped, 2006-11-08 02:26:47+03:00, sergefp@stripped +3 -1
    BUG#24056: Crash in subquery:
    Don't assume that condition that was pushed down into subquery has 
    produced exactly one KEY_FIELD element - it could produce several or
    none at all, handle all of those cases.

# 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:	pylon64.mylan
# Root:	/home/psergey/mysql-5.0-bug8804-pfix

--- 1.469/sql/sql_select.cc	2006-11-08 02:26:55 +03:00
+++ 1.470/sql/sql_select.cc	2006-11-08 02:26:55 +03:00
@@ -2951,10 +2951,12 @@
           join->unit->item->substype() == Item_subselect::IN_SUBS &&
           !join->unit->first_select()->next_select())
       {
+        KEY_FIELD *save= *key_fields;
         add_key_fields(join, key_fields, and_level, cond, usable_tables,
                        sargables);
         // Indicate that this ref access candidate is for subquery lookup:
-        (*key_fields)[-1].outer_ref= TRUE;
+        for (; save != *key_fields; save++)
+          save->outer_ref= TRUE;
       }
       return;
     }