Merge of WL#1469 with latest bk version.

BitKeeper/etc/logging_ok:
  auto-union

BitKeeper/etc/logging_ok

@@ -153,6 +153,7 @@ tim@hundin.mysql.fi
 tim@threads.polyesthetic.msg
 tim@white.box
 tim@work.mysql.com
+timour@mysql.com
 tom@basil-firewall.home.com
 tonu@hundin.mysql.fi
 tonu@volk.internalnet

mysql-test/r/distinct.result

@@ -388,8 +388,8 @@ SELECT DISTINCTROW email, shipcode FROM t1, t2 WHERE t1.infoID=t2.infoID;
 email	shipcode
 test1@testdomain.com	Z001
 test2@testdomain.com	Z001
-test3@testdomain.com	Z001
 test2@testdomain.com	R002
+test3@testdomain.com	Z001
 SELECT DISTINCTROW email FROM t1 ORDER BY dateentered DESC;
 email
 test1@testdomain.com

mysql-test/r/func_group.result

@@ -183,12 +183,12 @@ insert into t2 values('BBB', 20, 1.0);
 select t1.a1, t1.a2, t2.a1, t2.a2 from t1,t2;
 a1	a2	a1	a2
 10	aaa	AAA	10
-10	NULL	AAA	10
-10	bbb	AAA	10
-20	zzz	AAA	10
 10	aaa	BBB	20
+10	NULL	AAA	10
 10	NULL	BBB	20
+10	bbb	AAA	10
 10	bbb	BBB	20
+20	zzz	AAA	10
 20	zzz	BBB	20
 select max(t1.a1), max(t2.a1) from t1, t2 where t2.a2=9;
 max(t1.a1)	max(t2.a1)
@@ -551,7 +551,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain
 select min(a1) from t1  where a1 between a3 and 'KKK';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	14	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	14	Using where
 explain
 select min(a4) from t1  where (a4 + 0.01) between 0.07 and 0.08;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/r/select.result

@@ -1393,8 +1393,8 @@ companynr	companynr
 41	40
 explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using temporary
-1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using where; Using index
+1	SIMPLE	t4	index	NULL	PRIMARY	1	NULL	12	Using index; Using temporary
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
 select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
 fld1	companynr	fld3	period
 038008	37	reporters	1008
@@ -2279,10 +2279,10 @@ a	a	a
 2	2	2
 3	3	3
 select * from t1 natural join (t1 as t2 left join t1 as t3 using (a));
-a	a
-1	1
-2	2
-3	3
+a	a	a
+1	1	1
+2	2	2
+3	3	3
 select * from (t1 as t2 left join t1 as t3 using (a)) natural join t1;
 a	a	a
 1	1	1
@@ -2314,30 +2314,10 @@ left join t4 on id3 = id4 where id2 = 1 or id4 = 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t3	system	NULL	NULL	NULL	NULL	0	const row not found
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1	
-1	SIMPLE	t4	ALL	id4	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t4	ALL	id4	NULL	NULL	NULL	1	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1	Using where
 select * from t1 left join t2 on id1 = id2 left join t3 on id1 = id3
 left join t4 on id3 = id4 where id2 = 1 or id4 = 1;
 id1	id2	id3	id4	id44
 1	1	NULL	NULL	NULL
 drop table t1,t2,t3,t4;
-create table t1(s varchar(10) not null);
-create table t2(s varchar(10) not null primary key);
-create table t3(s varchar(10) not null primary key);
-insert into t1 values ('one\t'), ('two\t');
-insert into t2 values ('one\r'), ('two\t');
-insert into t3 values ('one '), ('two\t');
-select * from t1 where s = 'one';
-s
-select * from t2 where s = 'one';
-s
-select * from t3 where s = 'one';
-s
-one
-select * from t1,t2 where t1.s = t2.s;
-s	s
-two		two	
-select * from t2,t3 where t2.s = t3.s;
-s	s
-two		two	
-drop table t1, t2, t3;

sql/sql_select.h

@@ -116,6 +116,7 @@ typedef struct st_join_table {
 typedef struct st_position			/* Used in find_best */
 {
   double records_read;
+  double read_time;
   JOIN_TAB *table;
   KEYUSE *key;
 } POSITION;
@@ -133,8 +134,9 @@ typedef struct st_rollup
 class JOIN :public Sql_alloc
 {
  public:
-  JOIN_TAB *join_tab,**best_ref,**map2table;
-  JOIN_TAB *join_tab_save; //saved join_tab for subquery reexecution
+  JOIN_TAB *join_tab,**best_ref;
+  JOIN_TAB **map2table;    // mapping between table indexes and JOIN_TABs
+  JOIN_TAB *join_tab_save; // saved join_tab for subquery reexecution
   TABLE    **table,**all_tables,*sort_by_table;
   uint	   tables,const_tables;
   uint	   send_group_parts;
@@ -436,4 +438,4 @@ bool cp_buffer_from_ref(TABLE_REF *ref);
 bool error_if_full_join(JOIN *join);
 int report_error(TABLE *table, int error);
 int safe_index_read(JOIN_TAB *tab);
-COND *eliminate_not_funcs(THD *thd, COND *cond);
+COND *eliminate_not_funcs(COND *cond);

sql/sql_test.cc

@@ -232,6 +232,102 @@ TEST_join(JOIN *join)
   DBUG_VOID_RETURN;
 }
 
+
+/* 
+  Print the current state during query optimization.
+
+  SYNOPSIS
+    print_plan()
+    join         pointer to the structure providing all context info for
+                 the query
+    read_time    the cost of the best partial plan
+    record_count estimate for the number of records returned by the best
+                 partial plan
+    idx          length of the partial QEP in 'join->positions';
+                 also an index in the array 'join->best_ref';
+    info         comment string to appear above the printout
+
+  DESCRIPTION
+    This function prints to the log file DBUG_FILE the members of 'join' that
+    are used during query optimization (join->positions, join->best_positions,
+    and join->best_ref) and few other related variables (read_time,
+    record_count).
+    Useful to trace query optimizer functions.
+
+  RETURN
+    None
+*/
+
+void
+print_plan(JOIN* join, double read_time, double record_count,
+           uint idx, const char *info)
+{
+  uint i;
+  POSITION pos;
+  JOIN_TAB *join_table;
+  JOIN_TAB **plan_nodes;
+  TABLE*   table;
+
+  if (info == 0)
+    info= "";
+
+  DBUG_LOCK_FILE;
+  if (join->best_read == DBL_MAX)
+  {
+    fprintf(DBUG_FILE,"%s; idx:%u, best: DBL_MAX, current:%g\n",
+            info, idx, read_time);
+  }
+  else
+  {
+    fprintf(DBUG_FILE,"%s; idx: %u, best: %g, current: %g\n",
+            info, idx, join->best_read, read_time);
+  }
+
+  /* Print the tables in JOIN->positions */
+  fputs("     POSITIONS: ", DBUG_FILE);
+  for (i= 0; i < idx ; i++)
+  {
+    pos = join->positions[i];
+    table= pos.table->table;
+    if (table)
+      fputs(table->real_name, DBUG_FILE);
+    fputc(' ', DBUG_FILE);
+  }
+  fputc('\n', DBUG_FILE);
+
+  /*
+    Print the tables in JOIN->best_positions only if at least one complete plan
+    has been found. An indicator for this is the value of 'join->best_read'.
+  */
+  fputs("BEST_POSITIONS: ", DBUG_FILE);
+  if (join->best_read < DBL_MAX)
+  {
+    for (i= 0; i < idx ; i++)
+    {
+      pos= join->best_positions[i];
+      table= pos.table->table;
+      if (table)
+        fputs(table->real_name, DBUG_FILE);
+      fputc(' ', DBUG_FILE);
+    }
+  }
+  fputc('\n', DBUG_FILE);
+
+  /* Print the tables in JOIN->best_ref */
+  fputs("      BEST_REF: ", DBUG_FILE);
+  for (plan_nodes= join->best_ref ; *plan_nodes ; plan_nodes++)
+  {
+    join_table= (*plan_nodes);
+    fputs(join_table->table->real_name, DBUG_FILE);
+    fprintf(DBUG_FILE, "(%u,%u,%u)",
+            join_table->found_records, join_table->records, join_table->read_time);
+    fputc(' ', DBUG_FILE);
+  }
+  fputc('\n', DBUG_FILE);
+
+  DBUG_UNLOCK_FILE;
+}
+
 #endif
 
 typedef struct st_debug_lock
@@ -306,14 +402,10 @@ static void display_table_locks(void)
     THR_LOCK *lock=(THR_LOCK*) list->data;
 
     VOID(pthread_mutex_lock(&lock->mutex));
-    push_locks_into_array(&saved_table_locks, lock->write.data, FALSE,
-			  "Locked - write");
-    push_locks_into_array(&saved_table_locks, lock->write_wait.data, TRUE,
-			  "Waiting - write");
-    push_locks_into_array(&saved_table_locks, lock->read.data, FALSE,
-			  "Locked - read");
-    push_locks_into_array(&saved_table_locks, lock->read_wait.data, TRUE,
-			  "Waiting - read");
+    push_locks_into_array(&saved_table_locks, lock->write.data, false, "Locked - write");
+    push_locks_into_array(&saved_table_locks, lock->write_wait.data, true, "Waiting - write");
+    push_locks_into_array(&saved_table_locks, lock->read.data, false, "Locked - read");
+    push_locks_into_array(&saved_table_locks, lock->read_wait.data, true, "Waiting - read");
     VOID(pthread_mutex_unlock(&lock->mutex));
   }
   VOID(pthread_mutex_unlock(&THR_LOCK_lock));