Item_func_null doesn't have a separate Item for the first argument anymore.

args[0] is used instead. This allowed to resuse a lot of code.

mysql-test/r/func_in.result

@@ -111,3 +111,35 @@ id
 5
 9
 drop table t1;
+create table t1 (
+a char(1) character set latin1 collate latin1_general_ci,
+b char(1) character set latin1 collate latin1_swedish_ci,
+c char(1) character set latin1 collate latin1_danish_ci
+);
+insert into t1 values ('A','B','C');
+insert into t1 values ('a','c','c');
+select * from t1 where a in (b);
+ERROR HY000: Illegal mix of collations (latin1_general_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation ' IN '
+select * from t1 where a in (b,c);
+ERROR HY000: Illegal mix of collations (latin1_general_ci,IMPLICIT), (latin1_swedish_ci,IMPLICIT), (latin1_danish_ci,IMPLICIT) for operation ' IN '
+select * from t1 where 'a' in (a,b,c);
+ERROR HY000: Illegal mix of collations for operation ' IN '
+select * from t1 where 'a' in (a);
+a	b	c
+A	B	C
+a	c	c
+select * from t1 where a in ('a');
+a	b	c
+A	B	C
+a	c	c
+select * from t1 where 'a' collate latin1_general_ci in (a,b,c);
+a	b	c
+A	B	C
+a	c	c
+select * from t1 where 'a' collate latin1_bin in (a,b,c);
+a	b	c
+a	c	c
+select * from t1 where 'a' in (a,b,c collate latin1_bin);
+a	b	c
+a	c	c
+drop table t1;

mysql-test/r/func_str.result

@@ -363,15 +363,15 @@ select _latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin);
 _latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin)
 0
 select _latin2'B' in (_latin1'a',_latin1'b');
-ERROR HY000: Illegal mix of collations for operation ' IN '
+ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
 select _latin1'B' in (_latin2'a',_latin1'b');
-ERROR HY000: Illegal mix of collations for operation ' IN '
+ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
 select _latin1'B' in (_latin1'a',_latin2'b');
-ERROR HY000: Illegal mix of collations for operation ' IN '
+ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE) for operation ' IN '
 select _latin1'B' COLLATE latin1_general_ci in (_latin1'a' COLLATE latin1_bin,_latin1'b');
-ERROR HY000: Illegal mix of collations for operation ' IN '
+ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_bin,EXPLICIT), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
 select _latin1'B' COLLATE latin1_general_ci in (_latin1'a',_latin1'b' COLLATE latin1_bin);
-ERROR HY000: Illegal mix of collations for operation ' IN '
+ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_swedish_ci,COERCIBLE), (latin1_bin,EXPLICIT) for operation ' IN '
 select collation(bin(130)), coercibility(bin(130));
 collation(bin(130))	coercibility(bin(130))
 latin1_swedish_ci	3

mysql-test/t/func_in.test

@@ -54,3 +54,22 @@ insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9);
 select * from t1 where id in (2,5,9);
 drop table t1;
 
+create table t1 (
+a char(1) character set latin1 collate latin1_general_ci,
+b char(1) character set latin1 collate latin1_swedish_ci,
+c char(1) character set latin1 collate latin1_danish_ci
+);
+insert into t1 values ('A','B','C');
+insert into t1 values ('a','c','c');
+--error 1265
+select * from t1 where a in (b);
+--error 1268
+select * from t1 where a in (b,c);
+--error 1269
+select * from t1 where 'a' in (a,b,c);
+select * from t1 where 'a' in (a);
+select * from t1 where a in ('a');
+select * from t1 where 'a' collate latin1_general_ci in (a,b,c);
+select * from t1 where 'a' collate latin1_bin in (a,b,c);
+select * from t1 where 'a' in (a,b,c collate latin1_bin);
+drop table t1;

mysql-test/t/func_str.test

@@ -217,15 +217,15 @@ select _latin1'B' in (_latin1'a',_latin1'b');
 select _latin1'B' collate latin1_bin in (_latin1'a',_latin1'b');
 select _latin1'B' in (_latin1'a' collate latin1_bin,_latin1'b');
 select _latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin);
---error 1269
+--error 1268
 select _latin2'B' in (_latin1'a',_latin1'b');
---error 1269
+--error 1268
 select _latin1'B' in (_latin2'a',_latin1'b');
---error 1269
+--error 1268
 select _latin1'B' in (_latin1'a',_latin2'b');
---error 1269
+--error 1268
 select _latin1'B' COLLATE latin1_general_ci in (_latin1'a' COLLATE latin1_bin,_latin1'b');
---error 1269
+--error 1268
 select _latin1'B' COLLATE latin1_general_ci in (_latin1'a',_latin1'b' COLLATE latin1_bin);
 
 select collation(bin(130)), coercibility(bin(130));

sql/item_cmpfunc.cc

@@ -1420,7 +1420,7 @@ int cmp_item_row::compare(cmp_item *c)
 bool Item_func_in::nulls_in_row()
 {
   Item **arg,**arg_end;
-  for (arg= args, arg_end= args+arg_count; arg != arg_end ; arg++)
+  for (arg= args+1, arg_end= args+arg_count; arg != arg_end ; arg++)
   {
     if ((*arg)->null_inside())
       return 1;
@@ -1437,42 +1437,43 @@ static int srtcmp_in(CHARSET_INFO *cs, const String *x,const String *y)
 
 void Item_func_in::fix_length_and_dec()
 {
+  Item **arg, **arg_end;
+  uint const_itm= 1;
+  
+  if ((args[0]->result_type() == STRING_RESULT) &&
+      (agg_arg_collations_for_comparison(cmp_collation, args, arg_count)))
+    return;
+  
+  for (arg=args+1, arg_end=args+arg_count; arg != arg_end ; arg++)
+    const_itm&= arg[0]->const_item();
+  
   /*
     Row item with NULLs inside can return NULL or FALSE => 
     they can't be processed as static
   */
-  if (const_item() && !nulls_in_row())
+  if (const_itm && !nulls_in_row())
   {
-    switch (item->result_type()) {
+    switch (args[0]->result_type()) {
     case STRING_RESULT:
       uint i;
-      cmp_collation.set(item->collation);
-      for (i=0 ; i<arg_count; i++)
-	if (cmp_collation.aggregate(args[i]->collation))
-	  break;
-      if (cmp_collation.derivation == DERIVATION_NONE)
-      {
-        my_error(ER_CANT_AGGREGATE_NCOLLATIONS,MYF(0),func_name());
-	return;
-      }
-      array=new in_string(arg_count,(qsort2_cmp) srtcmp_in, 
+      array=new in_string(arg_count-1,(qsort2_cmp) srtcmp_in, 
 			  cmp_collation.collation);
       break;
     case INT_RESULT:
-      array= new in_longlong(arg_count);
+      array= new in_longlong(arg_count-1);
       break;
     case REAL_RESULT:
-      array= new in_double(arg_count);
+      array= new in_double(arg_count-1);
       break;
     case ROW_RESULT:
-      array= new in_row(arg_count, item);
+      array= new in_row(arg_count-1, args[0]);
       break;
     default:
       DBUG_ASSERT(0);
       return;
     }
     uint j=0;
-    for (uint i=0 ; i < arg_count ; i++)
+    for (uint i=1 ; i < arg_count ; i++)
     {
       array->set(j,args[i]);
       if (!args[i]->null_value)			// Skip NULL values
@@ -1485,19 +1486,19 @@ void Item_func_in::fix_length_and_dec()
   }
   else
   {
-    in_item= cmp_item::get_comparator(item);
+    in_item= cmp_item::get_comparator(args[0]);
+    if (args[0]->result_type() == STRING_RESULT)
+      in_item->cmp_charset= cmp_collation.collation;
   }
-  maybe_null= item->maybe_null;
+  maybe_null= args[0]->maybe_null;
   max_length= 1;
-  used_tables_cache|=item->used_tables();
-  const_item_cache&=item->const_item();
+  const_item_cache&=args[0]->const_item();
 }
 
 
 void Item_func_in::print(String *str)
 {
   str->append('(');
-  item->print(str);
   Item_func::print(str);
   str->append(')');
 }
@@ -1507,15 +1508,15 @@ longlong Item_func_in::val_int()
 {
   if (array)
   {
-    int tmp=array->find(item);
-    null_value=item->null_value || (!tmp && have_null);
+    int tmp=array->find(args[0]);
+    null_value=args[0]->null_value || (!tmp && have_null);
     return tmp;
   }
-  in_item->store_value(item);
-  if ((null_value=item->null_value))
+  in_item->store_value(args[0]);
+  if ((null_value=args[0]->null_value))
     return 0;
   have_null= 0;
-  for (uint i=0 ; i < arg_count ; i++)
+  for (uint i=1 ; i < arg_count ; i++)
   {
     if (!in_item->cmp(args[i]) && !args[i]->null_value)
       return 1;					// Would maybe be nice with i ?
@@ -1526,29 +1527,6 @@ longlong Item_func_in::val_int()
 }
 
 
-void Item_func_in::update_used_tables()
-{
-  Item_func::update_used_tables();
-  item->update_used_tables();
-  used_tables_cache|=item->used_tables();
-  const_item_cache&=item->const_item();
-}
-
-void Item_func_in::split_sum_func(Item **ref_pointer_array, List<Item> &fields)
-{
-  if (item->with_sum_func && item->type() != SUM_FUNC_ITEM)
-    item->split_sum_func(ref_pointer_array, fields);
-  else if (item->used_tables() || item->type() == SUM_FUNC_ITEM)
-  {
-    uint el= fields.elements;
-    fields.push_front(item);
-    ref_pointer_array[el]= item;
-    item= new Item_ref(ref_pointer_array + el, 0, item->name);
-  }  
-  Item_func::split_sum_func(ref_pointer_array, fields);
-}
-
-
 longlong Item_func_bit_or::val_int()
 {
   ulonglong arg1= (ulonglong) args[0]->val_int();

sql/item_cmpfunc.h

@@ -600,42 +600,26 @@ class cmp_item_sort_string_in_static :public cmp_item_string
 
 class Item_func_in :public Item_int_func
 {
-  Item *item;
   in_vector *array;
   cmp_item *in_item;
   bool have_null;
   DTCollation cmp_collation;
  public:
-  Item_func_in(Item *a,List<Item> &list)
-    :Item_int_func(list), item(a), array(0), in_item(0), have_null(0)
+  Item_func_in(List<Item> &list)
+    :Item_int_func(list), array(0), in_item(0), have_null(0)
   {
-    allowed_arg_cols= item->cols();
+    allowed_arg_cols= args[0]->cols();
   }
   longlong val_int();
-  bool fix_fields(THD *thd, struct st_table_list *tlist, Item **ref)
-  {
-    // We do not check item->cols(), because allowed_arg_cols assigned from it
-    bool res=(item->fix_fields(thd, tlist, &item) ||
-	      Item_func::fix_fields(thd, tlist, ref));
-    with_sum_func= with_sum_func || item->with_sum_func;
-    return res;
-  }
   void fix_length_and_dec();
-  ~Item_func_in() { delete item; delete array; delete in_item; }
+  ~Item_func_in() { delete array; delete in_item; }
   optimize_type select_optimize() const
     { return array ? OPTIMIZE_KEY : OPTIMIZE_NONE; }
-  Item *key_item() const { return item; }
+  Item *key_item() const { return args[0]; }
   void print(String *str);
   enum Functype functype() const { return IN_FUNC; }
   const char *func_name() const { return " IN "; }
-  void update_used_tables();
-  void split_sum_func(Item **ref_pointer_array, List<Item> &fields);
   bool nulls_in_row();
-  void set_outer_resolving()
-  {
-    item->set_outer_resolving();
-    Item_int_func::set_outer_resolving();
-  }
 };
 
 /* Functions used by where clause */

sql/opt_range.cc

@@ -832,10 +832,10 @@ static SEL_TREE *get_mm_tree(PARAM *param,COND *cond)
       Field *field=((Item_field*) (func->key_item()))->field;
       Item_result cmp_type=field->cmp_type();
       tree= get_mm_parts(param,field,Item_func::EQ_FUNC,
-			 func->arguments()[0],cmp_type);
+			 func->arguments()[1],cmp_type);
       if (!tree)
 	DBUG_RETURN(tree);			// Not key field
-      for (uint i=1 ; i < func->argument_count(); i++)
+      for (uint i=2 ; i < func->argument_count(); i++)
       {
 	SEL_TREE *new_tree=get_mm_parts(param,field,Item_func::EQ_FUNC,
 					func->arguments()[i],cmp_type);

sql/sql_yacc.yy

@@ -2109,9 +2109,9 @@ all_or_any: ALL     { $$ = 1; }
 /* expressions that begin with 'expr' */
 expr_expr:
 	 expr IN_SYM '(' expr_list ')'
-	  { $$= new Item_func_in($1,*$4); }
+	  { $4->push_front($1); $$= new Item_func_in(*$4); }
 	| expr NOT IN_SYM '(' expr_list ')'
-	  { $$= new Item_func_not(new Item_func_in($1,*$5)); }
+	  { $5->push_front($1); $$= new Item_func_not(new Item_func_in(*$5)); }
         | expr IN_SYM in_subselect
           { $$= new Item_in_subselect(YYTHD, $1, $3); }
 	| expr NOT IN_SYM in_subselect
@@ -2211,9 +2211,9 @@ no_in_expr:
 /* expressions that begin with 'expr' that does NOT follow AND */
 no_and_expr:
 	  no_and_expr IN_SYM '(' expr_list ')'
-	  { $$= new Item_func_in($1,*$4); }
+	  { $4->push_front($1); $$= new Item_func_in(*$4); }
 	| no_and_expr NOT IN_SYM '(' expr_list ')'
-	  { $$= new Item_func_not(new Item_func_in($1,*$5)); }
+	  { $5->push_front($1); $$= new Item_func_not(new Item_func_in(*$5)); }
         | no_and_expr IN_SYM in_subselect
           { $$= new Item_in_subselect(YYTHD, $1, $3); }
 	| no_and_expr NOT IN_SYM in_subselect