bzr commit into mysql-6.0 branch (sergefp:2822)

[Sergey Petrunia]

#At file:///home/spetrunia/dev/mysql-6.0-opt-merge/ based on revid:sergefp@stripped

 2822 Sergey Petrunia	2009-01-30
      Better comments
modified:
  sql/sql_select.cc

per-file messages:
  sql/sql_select.cc
    Better comments
=== modified file 'sql/sql_select.cc'
--- a/sql/sql_select.cc	2009-01-29 21:28:58 +0000
+++ b/sql/sql_select.cc	2009-01-30 10:08:48 +0000
@@ -3545,7 +3545,10 @@ bool JOIN::flatten_subqueries()
       DBUG_RETURN(TRUE);
   }
 skip_conversion:
-  /* 3. Finalize those we didn't convert */
+  /* 
+    3. Finalize (perform IN->EXISTS rewrite) the subqueries that we didn't
+    convert:
+  */
   for (; in_subq!= in_subq_end; in_subq++)
   {
     JOIN *child_join= (*in_subq)->unit->first_select()->join;