bk commit into 5.0 tree (gshchepa:1.2498) BUG#30201

[<gshchepa]

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ChangeSet@stripped, 2007-08-20 17:02:24+05:00, gshchepa@stripped +1 -0
  Fixed bug #30201.
  Killing a SELECT query with KILL QUERY or KILL CONNECTION
  caused a server crash if the query cache is enabled.
  
  Normal evaluation of a query may be interrupted by the
  KILL QUERY/CONNECTION statement, in this case the mysql_execute_command
  function returns TRUE. In this case the result of the query may
  be cached incompletely (omitting call to query_cache_insert inside
  the net_real_write function), and next call to query_cache_end_of_result
  may lead to server crash.
  Thus, the mysql_parse function has been modified to abort query
  cache in the case of query execution failure instead of
  the query_cache_end_of_result function call.
  

  sql/sql_parse.cc@stripped, 2007-08-20 17:02:03+05:00, gshchepa@stripped +5 -2
    Fixed bug #30201.
    The mysql_parse function has been modified to abort query
    cache in the case of query execution failure.

diff -Nrup a/sql/sql_parse.cc b/sql/sql_parse.cc
--- a/sql/sql_parse.cc	2007-08-05 08:53:13 +05:00
+++ b/sql/sql_parse.cc	2007-08-20 17:02:03 +05:00
@@ -6089,8 +6089,11 @@ void mysql_parse(THD *thd, const char *i
             thd->query_length--;
           /* Actually execute the query */
           lex->set_trg_event_type_for_tables();
-          mysql_execute_command(thd);
-          query_cache_end_of_result(thd);
+          if (mysql_execute_command(thd))
+            query_cache_abort(&thd->net);
+          else
+            query_cache_end_of_result(thd);
+
 	}
       }
     }