some bug fixes related to derived tables

mysql-test/r/derived.result

@@ -17,6 +17,19 @@ select t1.a,t4.y from t1,(select t2.a as y from t2,(select t3.b from t3 where t3
 a	y
 3	3
 3	3
+SELECT a FROM (SELECT 1 FROM (SELECT 1) HAVING a=1);
+Unknown column 'a' in 'having clause'
+SELECT a,b as a FROM (SELECT '1' as a,'2' as b) HAVING a=1;
+Column: 'a' in having clause is ambiguous
+SELECT a,2 as a FROM (SELECT '1' as a) HAVING a=2;
+a	a
+1	2
+SELECT a,2 as a FROM (SELECT '1' as a) HAVING a=1;
+a	a
+SELECT 1 FROM (SELECT 1) WHERE a=2;
+Unknown column 'a' in 'where clause'
+SELECT (SELECT 1) as a FROM (SELECT 1 FROM t1  HAVING a=1);
+Unknown column 'a' in 'having clause'
 drop table if exists  t1.t2,t3;
 select * from (select 1);
 1

mysql-test/t/derived.test

@@ -8,6 +8,16 @@ select t1.a,t3.a from t1,(select * from t2  where b='c') as t3  where t1.a = t3.
 CREATE TABLE t3 (a int not null, b char (10) not null);
 insert into t3 values (3,'f'),(4,'y'),(5,'z'),(6,'c');
 select t1.a,t4.y from t1,(select t2.a as y from t2,(select t3.b from t3 where t3.a>3) as t5  where t2.b=t5.b) as t4  where t1.a = t4.y;
+--error 1054
+SELECT a FROM (SELECT 1 FROM (SELECT 1) HAVING a=1);
+--error 1052
+SELECT a,b as a FROM (SELECT '1' as a,'2' as b) HAVING a=1;
+SELECT a,2 as a FROM (SELECT '1' as a) HAVING a=2;
+SELECT a,2 as a FROM (SELECT '1' as a) HAVING a=1;
+--error 1054
+SELECT 1 FROM (SELECT 1) WHERE a=2;
+--error 1054
+SELECT (SELECT 1) as a FROM (SELECT 1 FROM t1  HAVING a=1);
 drop table if exists  t1.t2,t3;
 select * from (select 1);
 select a from (select 1 as a);

sql/sql_base.cc

@@ -1748,7 +1748,9 @@ Field *find_field_in_table(THD *thd,TABLE *table,const char *name,uint length,
   }
   else
   {
-    Field **ptr=table->field;
+    Field **ptr;
+    if (!(ptr=table->field))
+      return (Field *)0;
     while ((field = *ptr++))
     {
       if (!my_strcasecmp(system_charset_info, field->field_name, name))

sql/sql_parse.cc

@@ -1332,11 +1332,6 @@ mysql_execute_command(THD *thd)
     TODO: make derived tables processing 'inside' SELECT processing.
     TODO: solve problem with depended derived tables in subselects
   */
-  if ((lex->select_lex.next_select_in_list() && 
-       lex->unit.create_total_list(thd, lex, &tables)) ||
-      (table_rules_on && tables && thd->slave_thread &&
-       !tables_ok(thd,tables)))
-    DBUG_VOID_RETURN;
   if (lex->derived_tables)
   {
     for (TABLE_LIST *cursor= tables;
@@ -1351,6 +1346,11 @@ mysql_execute_command(THD *thd)
 	DBUG_VOID_RETURN;
       }
   } 
+  if ((lex->select_lex.next_select_in_list() && 
+       lex->unit.create_total_list(thd, lex, &tables)) ||
+      (table_rules_on && tables && thd->slave_thread &&
+       !tables_ok(thd,tables)))
+    DBUG_VOID_RETURN;
 
   thread_safe_increment(com_stat[lex->sql_command],&LOCK_status);
   switch (lex->sql_command) {