Mistakes corrected, test file corrected.

mysql-test/t/table_value_const.test

+create table t1 (a int, b int);
+
+insert into t1 values (1,2),(4,6),(9,7),(1,1),(2,5),(7,8);
+
 values (1,2);
 
 select 1,2 union values (1,2);
 
 values (1,2) union select (1,2);
 
+values (1,2), (3,4) union select 1,2;
+
 select * from t1 where (t1.a,t1.b) in (select 5,7 union values (1,2),(2,3));
 
 select * from t1 where (t1.a,t1.b) in (values (1,2),(2,3) union select 5,7);
@@ -26,5 +32,5 @@ create view v1 as select 1,2 union values (3,4),(5,6);
 
 eval $drop_view;
 
-
+drop table t1;
 

sql/sql_lex.cc

@@ -2262,6 +2262,7 @@ void st_select_lex::init_select()
   with_dep= 0;
   join= 0;
   lock_type= TL_READ_DEFAULT;
+  tvc= 0;
 }
 
 /*

sql/sql_tvc.h

@@ -19,6 +19,10 @@ class table_value_constr : public Sql_alloc
   List<List_item> lists_of_values;
   select_result *result;
   
+  table_value_constr(List<List_item> tvc_values) : 
+    lists_of_values(tvc_values), result(0)
+  { }
+  
   bool prepare(THD *thd_arg, SELECT_LEX *sl, 
 	       select_result *tmp_result);
   bool exec();

sql/sql_union.cc

@@ -1357,17 +1357,21 @@ bool st_select_lex_unit::exec()
           we don't calculate found_rows() per union part.
           Otherwise, SQL_CALC_FOUND_ROWS should be done on all sub parts.
         */
-        sl->join->select_options= 
-          (select_limit_cnt == HA_POS_ERROR || sl->braces) ?
-          sl->options & ~OPTION_FOUND_ROWS : sl->options | found_rows_for_union;
-	saved_error= sl->join->optimize();
+	if (!sl->tvc)
+	{
+          sl->join->select_options= 
+            (select_limit_cnt == HA_POS_ERROR || sl->braces) ?
+            sl->options & ~OPTION_FOUND_ROWS : sl->options | found_rows_for_union;
+	  saved_error= sl->join->optimize();
+	}
       }
       if (!saved_error)
       {
 	records_at_start= table->file->stats.records;
 	if (sl->tvc)
 	  sl->tvc->exec();
-	sl->join->exec();
+	else
+	  sl->join->exec();
         if (sl == union_distinct && !(with_element && with_element->is_recursive))
 	{
           // This is UNION DISTINCT, so there should be a fake_select_lex
@@ -1376,7 +1380,8 @@ bool st_select_lex_unit::exec()
 	    DBUG_RETURN(TRUE);
 	  table->no_keyread=1;
 	}
-	saved_error= sl->join->error;
+	if (!sl->tvc)
+	  saved_error= sl->join->error;
 	offset_limit_cnt= (ha_rows)(sl->offset_limit ?
                                     sl->offset_limit->val_uint() :
                                     0);

sql/sql_yacc.yy

@@ -67,6 +67,7 @@
 #include "lex_token.h"
 #include "sql_lex.h"
 #include "sql_sequence.h"
+#include "sql_tvc.h"
 
 /* this is to get the bison compilation windows warnings out */
 #ifdef _MSC_VER
@@ -16277,7 +16278,8 @@ table_value_constructor:
 	    LEX *lex=Lex;
 	    $$= Lex->current_select;
 	    mysql_init_select(Lex);
-	    $$->tvc->lists_of_values= lex->many_values;
+	    table_value_constr tvc(lex->many_values);
+	    $$->tvc= &tvc;
 	  }
 	;