subqueries made printable

new EXPLAIN parameter to show real query as it was interpreted
(SCRUM) (WL#1274)


mysql-test/r/subselect.result:
  new explains
mysql-test/r/union.result:
  new explains
mysql-test/t/subselect.test:
  new explains
mysql-test/t/union.test:
  new explains
sql/item.cc:
  fixed printability of Items in SELECT list
sql/item.h:
  fixed printability of Items in SELECT list
sql/item_cmpfunc.cc:
  fixed print()
sql/item_cmpfunc.h:
  fixed print()
sql/item_subselect.cc:
  subqueries made printable
sql/item_subselect.h:
  subqueries made printable
sql/mysql_priv.h:
  union option made looks like options
sql/sql_derived.cc:
  now this link is used
sql/sql_lex.cc:
  subqueries made printable
sql/sql_lex.h:
  subqueries made printable
  new EXPLAIN parameter support
sql/sql_parse.cc:
  new EXPLAIN parameter
sql/sql_select.cc:
  debug output
  new EXPLAIN parameter support
sql/sql_select.h:
  new EXPLAIN parameter support
sql/sql_yacc.yy:
  new EXPLAIN parameter support
  SELECT printability support

1 files changed, 0 insertions, 4 deletions

diff --git a/sql/sql_derived.cc b/sql/sql_derived.cc
index 13d3cc27376..aac2e17086b 100644
--- a/sql/sql_derived.cc
+++ b/sql/sql_derived.cc
@@ -222,10 +222,6 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit,
 	  else
 	    unit->exclude_level();
 	  org_table_list->db= (char *)"";
-#ifndef DBUG_OFF
-	  /* Try to catch errors if this is accessed */
-	  org_table_list->derived=(SELECT_LEX_UNIT *) 1;
-#endif
 	  // Force read of table stats in the optimizer
 	  table->file->info(HA_STATUS_VARIABLE);
 	}