Fix bugs in LEFT JOIN and field=NUL

BUILD/FINISH.sh:
  Remove all config.cache files
BUILD/compile-alpha-debug:
  Update
BUILD/compile-ia64-debug-max:
  Update
Docs/manual.texi:
  Added auto_increment example
sql/sql_select.cc:
  Fix bugs in LEFT JOIN and field=NULL
sql/sql_yacc.yy:
  Remove compiler warnings

BUILD/FINISH.sh

@@ -10,7 +10,7 @@ done
 
 commands="\
 $make -k clean || true 
-/bin/rm -f */.deps/*.P config.cache
+/bin/rm -f */.deps/*.P config.cache innobase/config.cache bdb/build_unix/config.cache
 
 aclocal && autoheader && aclocal && automake && autoconf
 (cd bdb/dist && sh s_all)

BUILD/compile-alpha-debug

@@ -3,5 +3,5 @@ make -k clean
 /bin/rm -f config.cache
 aclocal; autoheader; aclocal; automake; autoconf
 
-CFLAGS=-O6 CXX=gcc CXXFLAGS="-O6 -felide-constructors -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql --with-debug
+CFLAGS=-O6 CXX=gcc CXXFLAGS="-O6 -felide-constructors -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local/mysql --with-debug --with-extra-charsets=complex
 make

BUILD/compile-ia64-debug-max

 gmake -k clean || true 
-/bin/rm -f */.deps/*.P config.cache
+/bin/rm -f */.deps/*.P config.cache innobase/config.cache bdb/build_unix/config.cache
 
 aclocal && autoheader && aclocal && automake && autoconf
 (cd bdb/dist && sh s_all)

Docs/manual.texi

@@ -3380,13 +3380,9 @@ of contributing to the MySQL development while getting something useful
  in return, is to purchase support directly from MySQL AB.
 @end itemize
 
-For examples of situations when a commercial license is needed, please
-visit the online manual at @uref{http://www.mysql.com/doc/}.
-
 For buying commercial licenses and support, please visit the order section
 at @uref{https://order.mysql.com/}.
 
-
 @node Using the MySQL server for free under GPL,  , Using the MySQL server under a commercial license, MySQL server licenses
 @subsection Using the MySQL server for free under GPL
 
@@ -14653,6 +14649,7 @@ mysql> SELECT * FROM shop;
 * example-Foreign keys::        Using foreign keys
 * Searching on two keys::       Searching on Two Keys
 * Calculating days::            Calculating visits per day
+* example-AUTO_INCREMENT::      Using AUTO_INCREMENT
 @end menu
 
 
@@ -14951,7 +14948,7 @@ DROP TABLE tmp;
 The above way to solve this query is in effect a @code{UNION} of two queries.
 
 
-@node Calculating days,  , Searching on two keys, Examples
+@node Calculating days, example-AUTO_INCREMENT, Searching on two keys, Examples
 @subsection Calculating visits per day
 
 @findex BIT_OR
@@ -14982,6 +14979,67 @@ The above calculates how many different days was used for a given
 year/month combination, with automatic removal of duplicate entries.
 
 
+@node example-AUTO_INCREMENT,  , Calculating days, Examples
+@subsection Using AUTO_INCREMENT
+
+@cindex AUTO_INCREMENT
+The @code{AUTO_INCREMENT} attribute can be used to generate an unique
+identity for new rows:
+
+@example
+CREATE TABLE animals (id mediumint not null auto_increment,
+name char(30) not null,
+primary key (id));
+INSERT INTO animals (name) values ("dog"),("cat"),("penguin"),("lax"),("whale");
+SELECT * FROM animals;
+
+Which returns:
+
++----+---------+
+| id | name    |
++----+---------+
+|  1 | dog     |
+|  2 | cat     |
+|  3 | penguin |
+|  4 | lax     |
+|  5 | whale    |
++----+---------+
+@end example
+
+For MyISAM and BDB tables you can specify @code{AUTO_INCREMENT} on
+secondary column in a multi-column key.  In this case the generated
+value for the autoincrement column is calculated as
+@code{MAX(auto_increment_column)+1) WHERE prefix=given-prefix}.  This is
+useful when you want to put data into ordered groups.
+
+@example
+CREATE TABLE animals (grp enum ('fish','mammal','bird') not null,
+id mediumint not null auto_increment,
+name char(30) not null,
+primary key (grp,id));
+INSERT INTO animals (grp,name) values ("mammal","dog"),("mammal","cat"),("bird","penguin"),("fish","lax"),("mammal","whale");
+SELECT * FROM animals order by grp,id;
+
+Which returns:
+
++--------+----+---------+
+| grp    | id | name    |
++--------+----+---------+
+| fish   |  1 | lax     |
+| mammal |  1 | dog     |
+| mammal |  2 | cat     |
+| mammal |  3 | whale   |
+| bird   |  1 | penguin |
++--------+----+---------+
+@end example
+
+Note that in this case, the auto_increment value will be reused if you
+delete the row with the biggest auto_increment value in any group.
+
+You can get the used @code{AUTO_INCREMENT} key with the
+@code{LAST_INSERT_ID()} SQL function or the @code{mysql_insert_id()} API
+function.
+
 @node Batch mode, Twin, Examples, Tutorial
 @section Using @code{mysql} in Batch Mode
 
@@ -35026,6 +35084,9 @@ positive number.  This is done to avoid precision problems when
 numbers 'wrap' over from positive to negative and also to ensure that one
 doesn't accidentally get an auto_increment column that contains 0.
 
+In MyISAM and BDB tables you can specify @code{AUTO_INCREMENT} secondary
+column in a multi-column key.  @xref{example-AUTO_INCREMENT}.
+
 @cindex ODBC compatibility
 @cindex compatibility, with ODBC
 To make MySQL compatible with some ODBC applications, you can find

sql/sql_select.cc

@@ -5084,15 +5084,15 @@ end_write_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
 static bool test_if_ref(Item_field *left_item,Item *right_item)
 {
   Field *field=left_item->field;
-  if (!field->table->const_table)		// No need to change const test
+  // No need to change const test. We also have to keep tests on LEFT JOIN
+  if (!field->table->const_table && !field->table->maybe_null)
   {
     Item *ref_item=part_of_refkey(field->table,field);
     if (ref_item && ref_item->eq(right_item))
     {
       if (right_item->type() == Item::FIELD_ITEM)
-	return (field->eq_def(((Item_field *) right_item)->field) &&
-		!field->table->maybe_null);
-      if (right_item->const_item())
+	return (field->eq_def(((Item_field *) right_item)->field));
+      if (right_item->const_item() && !(right_item->is_null()))
       {
 	// We can remove binary fields and numerical fields except float,
 	// as float comparison isn't 100 % secure

sql/sql_yacc.yy

@@ -1562,10 +1562,10 @@ simple_expr:
 	| '{' ident expr '}'	{ $$= $3; }
         | MATCH ident_list_arg AGAINST '(' expr ')'
           { Select->ftfunc_list.push_back((Item_func_match *)
-                   $$=new Item_func_match_nl(*$2,$5)); }
+                   ($$=new Item_func_match_nl(*$2,$5))); }
         | MATCH ident_list_arg AGAINST '(' expr IN_SYM BOOLEAN_SYM MODE_SYM ')'
           { Select->ftfunc_list.push_back((Item_func_match *)
-                   $$=new Item_func_match_bool(*$2,$5)); }
+                   ($$=new Item_func_match_bool(*$2,$5))); }
 	| BINARY expr %prec NEG	{ $$= new Item_func_binary($2); }
 	| CASE_SYM opt_expr WHEN_SYM when_list opt_else END
 	  { $$= new Item_func_case(* $4, $2, $5 ) }