Excluded posibility of tmp_table_param.copy_field double deletion (BUG#14851).

mysql-test/r/kill.result:
  BUG#14851 test
mysql-test/t/kill.test:
  BUG#14851 test
sql/sql_class.cc:
  Debug prints are added.
sql/sql_select.cc:
  Allocation of tmp_join fixed to involve constructor (it is not related to the bug directly but might cause other problems).
  Excluded posibility of tmp_table_param.copy_field double deletion (BUG#14851).
sql/sql_select.h:
  JOINs constructor added, initialization of them fixed (it is not related to the bug directly but might cause other problems).

1 files changed, 9 insertions, 2 deletions

diff --git a/sql/sql_select.h b/sql/sql_select.h
index 636ee967645..94cc8839466 100644
--- a/sql/sql_select.h
+++ b/sql/sql_select.h
@@ -227,7 +227,14 @@ class JOIN :public Sql_alloc
   {
     init(thd_arg, fields_arg, select_options_arg, result_arg);
   }
-  
+
+  JOIN(JOIN &join)
+    :fields_list(join.fields_list)
+  {
+    init(join.thd, join.fields_list, join.select_options,
+         join.result);
+  }
+
   void init(THD *thd_arg, List<Item> &fields_arg, ulong select_options_arg,
        select_result *result_arg)
   {
@@ -272,7 +279,7 @@ class JOIN :public Sql_alloc
 
     fields_list= fields_arg;
     bzero((char*) &keyuse,sizeof(keyuse));
-    tmp_table_param.copy_field=0;
+    tmp_table_param.init();
     tmp_table_param.end_write_records= HA_POS_ERROR;
     rollup.state= ROLLUP::STATE_NONE;
   }