Fixed LP BUG#615760: Check on double cache assignment added into the transformation methods.

Cache parameters print added in EXPLAIN EXTENDED output.

mysql-test/r/compare.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/group_by.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect3.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect3_jcl6.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect4.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect_cache.result:
  Added test suite for LP BUG#615760
mysql-test/r/subselect_mat.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect_no_mat.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect_no_opts.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect_no_semijoin.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect_sj.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/r/subselect_sj_jcl6.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/suite/pbxt/r/subselect.result:
  Cache parameters print added in EXPLAIN EXTENDED output.
mysql-test/t/subselect_cache.test:
  Cache parameters print added in EXPLAIN EXTENDED output.
sql/item.cc:
  Item::set_expr_cache result fixed according to its description.
  
  Cache parameters print added in EXPLAIN EXTENDED output.
sql/item.h:
  Cache parameters print added in EXPLAIN EXTENDED output.
sql/item_cmpfunc.cc:
  Check on double cache assignment added into the transformation methods.
sql/item_cmpfunc.h:
  Check on double cache assignment added into the transformation methods.
sql/item_subselect.cc:
  Check on double cache assignment added into the transformation methods.
sql/item_subselect.h:
  Check on double cache assignment added into the transformation methods.
sql/sql_expression_cache.cc:
  Cache parameters print added.
sql/sql_expression_cache.h:
  Cache parameters print added.
sql/sql_select.cc:
  Removed unused method (now it is impossible to make double transformation with the cache).
sql/sql_select.h:
  Removed unused method.

1 files changed, 18 insertions, 0 deletions

diff --git a/sql/sql_expression_cache.cc b/sql/sql_expression_cache.cc
index 9596ca87bab..cbbafbd55c8 100644
--- a/sql/sql_expression_cache.cc
+++ b/sql/sql_expression_cache.cc
@@ -314,3 +314,21 @@ err:
   cache_table= NULL;
   DBUG_RETURN(TRUE);
 }
+
+
+void Expression_cache_tmptable::print(String *str, enum_query_type query_type)
+{
+  List_iterator<Item*> li(*list);
+  Item **item;
+  bool is_first= TRUE;
+
+  str->append('<');
+  while ((item= li++))
+  {
+    if (!is_first)
+      str->append(',');
+    (*item)->print(str, query_type);
+    is_first= FALSE;
+  }
+  str->append('>');
+}