Manual merge

mysql-test/r/func_gconcat.result:
  Auto merged
mysql-test/t/func_gconcat.test:
  Auto merged

mysql-test/r/func_gconcat.result

@@ -576,3 +576,23 @@ group_concat('x')
 NULL
 1
 drop table t1;
+CREATE TABLE t1 (id int, a varchar(9));
+INSERT INTO t1 VALUES
+(2, ''), (1, ''), (2, 'x'), (1, 'y'), (3, 'z'), (3, '');
+SELECT GROUP_CONCAT(a) FROM t1;
+GROUP_CONCAT(a)
+,,x,y,z,
+SELECT GROUP_CONCAT(a ORDER BY a) FROM t1;
+GROUP_CONCAT(a ORDER BY a)
+,,,x,y,z
+SELECT GROUP_CONCAT(a) FROM t1 GROUP BY id;
+GROUP_CONCAT(a)
+,y
+,x
+z,
+SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY id;
+GROUP_CONCAT(a ORDER BY a)
+,y
+,x
+,z
+DROP TABLE t1;

mysql-test/t/func_gconcat.test

@@ -373,4 +373,20 @@ select * from (select group_concat(a) from t1) t2;
 select group_concat('x') UNION ALL select 1;
 drop table t1;
 
+#
+# Bug #12863 : missing separators after first empty cancatanated elements
+#
+
+CREATE TABLE t1 (id int, a varchar(9));
+INSERT INTO t1 VALUES
+  (2, ''), (1, ''), (2, 'x'), (1, 'y'), (3, 'z'), (3, '');
+
+SELECT GROUP_CONCAT(a) FROM t1;
+SELECT GROUP_CONCAT(a ORDER BY a) FROM t1;
+
+SELECT GROUP_CONCAT(a) FROM t1 GROUP BY id;
+SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY id;
+
+DROP TABLE t1;
+
 # End of 4.1 tests

sql/item_sum.cc

@@ -2740,8 +2740,10 @@ int dump_leaf_key(byte* key, element_count count __attribute__((unused)),
   String *result= &item->result;
   Item **arg= item->args, **arg_end= item->args + item->arg_count_field;
 
-  if (result->length())
-    result->append(*item->separator);
+  if (item->no_appended)
+    item->no_appended= FALSE;
+  else
+    item->result.append(*item->separator);
 
   tmp.length(0);
 
@@ -2925,6 +2927,7 @@ void Item_func_group_concat::clear()
   result.copy();
   null_value= TRUE;
   warning_for_row= FALSE;
+  no_appended= TRUE;
   if (tree)
     reset_tree(tree);
   /* No need to reset the table as we never call write_row */
@@ -2969,6 +2972,12 @@ bool Item_func_group_concat::add()
 }
 
 
+void Item_func_group_concat::reset_field()
+{
+  DBUG_ASSERT(0);
+}
+
+
 bool
 Item_func_group_concat::fix_fields(THD *thd, Item **ref)
 {

sql/item_sum.h

@@ -27,9 +27,9 @@ class Item_sum :public Item_result_field
 {
 public:
   enum Sumfunctype
-  { COUNT_FUNC, COUNT_DISTINCT_FUNC, SUM_FUNC, SUM_DISTINCT_FUNC, AVG_FUNC,
-    AVG_DISTINCT_FUNC, MIN_FUNC, MAX_FUNC, UNIQUE_USERS_FUNC, STD_FUNC,
-    VARIANCE_FUNC, SUM_BIT_FUNC, UDF_SUM_FUNC, GROUP_CONCAT_FUNC
+  { COUNT_FUNC,COUNT_DISTINCT_FUNC,SUM_FUNC,AVG_FUNC,MIN_FUNC,
+    MAX_FUNC, UNIQUE_USERS_FUNC,STD_FUNC,VARIANCE_FUNC,SUM_BIT_FUNC,
+    UDF_SUM_FUNC, GROUP_CONCAT_FUNC
   };
 
   Item **args, *tmp_args[2];
@@ -66,9 +66,6 @@ class Item_sum :public Item_result_field
     a temporary table. Similar to reset(), but must also store value in
     result_field. Like reset() it is supposed to reset start value to
     default.
-    This set of methods (reult_field(), reset_field, update_field()) of
-    Item_sum is used only if quick_group is not null. Otherwise
-    copy_or_same() is used to obtain a copy of this item.
   */
   virtual void reset_field()=0;
   /*
@@ -79,24 +76,9 @@ class Item_sum :public Item_result_field
   virtual void update_field()=0;
   virtual bool keep_field_type(void) const { return 0; }
   virtual void fix_length_and_dec() { maybe_null=1; null_value=1; }
-  /*
-    This method is used for debug purposes to print the name of an
-    item to the debug log. The second use of this method is as
-    a helper function of print(), where it is applicable.
-    To suit both goals it should return a meaningful,
-    distinguishable and sintactically correct string.  This method
-    should not be used for runtime type identification, use enum
-    {Sum}Functype and Item_func::functype()/Item_sum::sum_func()
-    instead.
-
-    NOTE: for Items inherited from Item_sum, func_name() return part of
-    function name till first argument (including '(') to make difference in
-    names for functions with 'distinct' clause and without 'distinct' and
-    also to make printing of items inherited from Item_sum uniform.
-  */
-  virtual const char *func_name() const= 0;
+  virtual const char *func_name() const { return "?"; }
   virtual Item *result_item(Field *field)
-    { return new Item_field(field); }
+    { return new Item_field(field);}
   table_map used_tables() const { return ~(table_map) 0; } /* Not used */
   bool const_item() const { return 0; }
   bool is_null() { return null_value; }
@@ -108,8 +90,7 @@ class Item_sum :public Item_result_field
   virtual bool setup(THD *thd) {return 0;}
   virtual void make_unique() {}
   Item *get_tmp_table_item(THD *thd);
-  virtual Field *create_tmp_field(bool group, TABLE *table,
-                                  uint convert_blob_length);
+
   bool walk (Item_processor processor, byte *argument);
 };
 
@@ -122,14 +103,10 @@ class Item_sum_num :public Item_sum
   Item_sum_num(Item *a, Item* b) :Item_sum(a,b) {}
   Item_sum_num(List<Item> &list) :Item_sum(list) {}
   Item_sum_num(THD *thd, Item_sum_num *item) :Item_sum(thd, item) {}
-  bool fix_fields(THD *, Item **);
+  bool fix_fields(THD *, TABLE_LIST *, Item **);
   longlong val_int()
-  {
-    DBUG_ASSERT(fixed == 1);
-    return (longlong) val_real();             /* Real as default */
-  }
+    { DBUG_ASSERT(fixed == 1); return (longlong) val(); } /* Real as default */
   String *val_str(String*str);
-  my_decimal *val_decimal(my_decimal *);
   void reset_field();
 };
 
@@ -140,9 +117,8 @@ class Item_sum_int :public Item_sum_num
   Item_sum_int(Item *item_par) :Item_sum_num(item_par) {}
   Item_sum_int(List<Item> &list) :Item_sum_num(list) {}
   Item_sum_int(THD *thd, Item_sum_int *item) :Item_sum_num(thd, item) {}
-  double val_real() { DBUG_ASSERT(fixed == 1); return (double) val_int(); }
+  double val() { DBUG_ASSERT(fixed == 1); return (double) val_int(); }
   String *val_str(String*str);
-  my_decimal *val_decimal(my_decimal *);
   enum Item_result result_type () const { return INT_RESULT; }
   void fix_length_and_dec()
   { decimals=0; max_length=21; maybe_null=null_value=0; }
@@ -151,115 +127,25 @@ class Item_sum_int :public Item_sum_num
 
 class Item_sum_sum :public Item_sum_num
 {
-protected:
-  Item_result hybrid_type;
   double sum;
-  my_decimal dec_buffs[2];
-  uint curr_dec_buff;
-  void fix_length_and_dec();
+  void fix_length_and_dec() { maybe_null=null_value=1; }
 
-public:
-  Item_sum_sum(Item *item_par) :Item_sum_num(item_par) {}
-  Item_sum_sum(THD *thd, Item_sum_sum *item);
+  public:
+  Item_sum_sum(Item *item_par) :Item_sum_num(item_par),sum(0.0) {}
+  Item_sum_sum(THD *thd, Item_sum_sum *item) 
+    :Item_sum_num(thd, item), sum(item->sum) {}
   enum Sumfunctype sum_func () const {return SUM_FUNC;}
   void clear();
   bool add();
-  double val_real();
-  longlong val_int();
-  String *val_str(String*str);
-  my_decimal *val_decimal(my_decimal *);
-  enum Item_result result_type () const { return hybrid_type; }
+  double val();
   void reset_field();
   void update_field();
   void no_rows_in_result() {}
-  const char *func_name() const { return "sum("; }
+  const char *func_name() const { return "sum"; }
   Item *copy_or_same(THD* thd);
 };
 
 
-
-/* Common class for SUM(DISTINCT), AVG(DISTINCT) */
-
-class Unique;
-
-class Item_sum_distinct :public Item_sum_num
-{
-protected:
-  /* storage for the summation result */
-  ulonglong count;
-  Hybrid_type val;
-  /* storage for unique elements */
-  Unique *tree;
-  TABLE *table;
-  enum enum_field_types table_field_type;
-  uint tree_key_length;
-protected:
-  Item_sum_distinct(THD *thd, Item_sum_distinct *item);
-public:
-  Item_sum_distinct(Item *item_par);
-  ~Item_sum_distinct();
-
-  bool setup(THD *thd);
-  void clear();
-  void cleanup();
-  bool add();
-  double val_real();
-  my_decimal *val_decimal(my_decimal *);
-  longlong val_int();
-  String *val_str(String *str);
-
-  /* XXX: does it need make_unique? */
-
-  enum Sumfunctype sum_func () const { return SUM_DISTINCT_FUNC; }
-  void reset_field() {} // not used
-  void update_field() {} // not used
-  virtual void no_rows_in_result() {}
-  void fix_length_and_dec();
-  enum Item_result result_type () const { return val.traits->type(); }
-  virtual void calculate_val_and_count();
-  virtual bool unique_walk_function(void *elem);
-};
-
-
-/*
-  Item_sum_sum_distinct - implementation of SUM(DISTINCT expr).
-  See also: MySQL manual, chapter 'Adding New Functions To MySQL'
-  and comments in item_sum.cc.
-*/
-
-class Item_sum_sum_distinct :public Item_sum_distinct
-{
-private:
-  Item_sum_sum_distinct(THD *thd, Item_sum_sum_distinct *item)
-    :Item_sum_distinct(thd, item) {}
-public:
-  Item_sum_sum_distinct(Item *item_arg) :Item_sum_distinct(item_arg) {}
-
-  enum Sumfunctype sum_func () const { return SUM_DISTINCT_FUNC; }
-  const char *func_name() const { return "sum(distinct "; }
-  Item *copy_or_same(THD* thd) { return new Item_sum_sum_distinct(thd, this); }
-};
-
-
-/* Item_sum_avg_distinct - SELECT AVG(DISTINCT expr) FROM ... */
-
-class Item_sum_avg_distinct: public Item_sum_distinct
-{
-private:
-  Item_sum_avg_distinct(THD *thd, Item_sum_avg_distinct *original)
-    :Item_sum_distinct(thd, original) {}
-public:
-  uint prec_increment;
-  Item_sum_avg_distinct(Item *item_arg) : Item_sum_distinct(item_arg) {}
-
-  void fix_length_and_dec();
-  virtual void calculate_val_and_count();
-  enum Sumfunctype sum_func () const { return AVG_DISTINCT_FUNC; }
-  const char *func_name() const { return "avg(distinct "; }
-  Item *copy_or_same(THD* thd) { return new Item_sum_avg_distinct(thd, this); }
-};
-
-
 class Item_sum_count :public Item_sum_int
 {
   longlong count;
@@ -284,7 +170,7 @@ class Item_sum_count :public Item_sum_int
   void reset_field();
   void cleanup();
   void update_field();
-  const char *func_name() const { return "count("; }
+  const char *func_name() const { return "count"; }
   Item *copy_or_same(THD* thd);
 };
 
@@ -294,55 +180,80 @@ class TMP_TABLE_PARAM;
 class Item_sum_count_distinct :public Item_sum_int
 {
   TABLE *table;
+  table_map used_table_cache;
   uint32 *field_lengths;
   TMP_TABLE_PARAM *tmp_table_param;
-  /*
-    If there are no blobs, we can use a tree, which
-    is faster than heap table. In that case, we still use the table
-    to help get things set up, but we insert nothing in it
-  */
-  Unique *tree;
+  TREE tree_base;
+  TREE *tree;
   /*
     Following is 0 normal object and pointer to original one for copy 
     (to correctly free resources)
   */
   Item_sum_count_distinct *original;
-  uint tree_key_length;
 
+  uint key_length;
+  CHARSET_INFO *key_charset;
+  
+  /*
+    Calculated based on max_heap_table_size. If reached,
+    walk the tree and dump it into MyISAM table
+  */
+  uint max_elements_in_tree;
+
+  /*
+    The first few bytes of record ( at least one)
+    are just markers for deleted and NULLs. We want to skip them since
+    they will just bloat the tree without providing any valuable info
+  */
+  int rec_offset;
 
+  /*
+    If there are no blobs, we can use a tree, which
+    is faster than heap table. In that case, we still use the table
+    to help get things set up, but we insert nothing in it
+  */
+  bool use_tree;
   bool always_null;		// Set to 1 if the result is always NULL
 
+  int tree_to_myisam();
 
   friend int composite_key_cmp(void* arg, byte* key1, byte* key2);
   friend int simple_str_key_cmp(void* arg, byte* key1, byte* key2);
+  friend int simple_raw_key_cmp(void* arg, byte* key1, byte* key2);
+  friend int dump_leaf(byte* key, uint32 count __attribute__((unused)),
+		       Item_sum_count_distinct* item);
 
-public:
+  public:
   Item_sum_count_distinct(List<Item> &list)
-    :Item_sum_int(list), table(0), field_lengths(0), tmp_table_param(0),
-     tree(0), original(0), always_null(FALSE)
+    :Item_sum_int(list), table(0), used_table_cache(~(table_map) 0),
+     tmp_table_param(0), tree(&tree_base), original(0), use_tree(0),
+     always_null(0)
   { quick_group= 0; }
   Item_sum_count_distinct(THD *thd, Item_sum_count_distinct *item)
     :Item_sum_int(thd, item), table(item->table),
+     used_table_cache(item->used_table_cache),
      field_lengths(item->field_lengths),
      tmp_table_param(item->tmp_table_param),
-     tree(item->tree), original(item), tree_key_length(item->tree_key_length),
+     tree(item->tree), original(item), key_length(item->key_length),
+     max_elements_in_tree(item->max_elements_in_tree),
+     rec_offset(item->rec_offset), use_tree(item->use_tree),
      always_null(item->always_null)
   {}
-  ~Item_sum_count_distinct();
-
   void cleanup();
 
+  table_map used_tables() const { return used_table_cache; }
   enum Sumfunctype sum_func () const { return COUNT_DISTINCT_FUNC; }
   void clear();
   bool add();
   longlong val_int();
   void reset_field() { return ;}		// Never called
   void update_field() { return ; }		// Never called
-  const char *func_name() const { return "count(distinct "; }
+  const char *func_name() const { return "count_distinct"; }
   bool setup(THD *thd);
   void make_unique();
   Item *copy_or_same(THD* thd);
   void no_rows_in_result() {}
+  void print(String *str);
 };
 
 
@@ -354,55 +265,43 @@ class Item_avg_field :public Item_result_field
 {
 public:
   Field *field;
-  Item_result hybrid_type;
-  uint f_precision, f_scale, dec_bin_size;
-  uint prec_increment;
-  Item_avg_field(Item_result res_type, Item_sum_avg *item);
+  Item_avg_field(Item_sum_avg *item);
   enum Type type() const { return FIELD_AVG_ITEM; }
-  double val_real();
-  longlong val_int();
-  my_decimal *val_decimal(my_decimal *);
+  double val();
+  longlong val_int() { /* can't be fix_fields()ed */ return (longlong) val(); }
   bool is_null() { (void) val_int(); return null_value; }
   String *val_str(String*);
-  enum_field_types field_type() const
-  {
-    return hybrid_type == DECIMAL_RESULT ?
-      MYSQL_TYPE_NEWDECIMAL : MYSQL_TYPE_DOUBLE;
-  }
+  enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE; }
   void fix_length_and_dec() {}
-  enum Item_result result_type () const { return hybrid_type; }
 };
 
 
-class Item_sum_avg :public Item_sum_sum
+class Item_sum_avg :public Item_sum_num
 {
-public:
+  void fix_length_and_dec()
+  {
+    decimals=min(decimals+4, NOT_FIXED_DEC);
+    maybe_null=1;
+  }
+
+  double sum;
   ulonglong count;
-  uint prec_increment;
-  uint f_precision, f_scale, dec_bin_size;
 
-  Item_sum_avg(Item *item_par) :Item_sum_sum(item_par), count(0) {}
+  public:
+  Item_sum_avg(Item *item_par) :Item_sum_num(item_par), sum(0.0), count(0) {}
   Item_sum_avg(THD *thd, Item_sum_avg *item)
-    :Item_sum_sum(thd, item), count(item->count),
-    prec_increment(item->prec_increment) {}
-
-  void fix_length_and_dec();
+    :Item_sum_num(thd, item), sum(item->sum), count(item->count) {}
   enum Sumfunctype sum_func () const {return AVG_FUNC;}
   void clear();
   bool add();
-  double val_real();
-  // In SPs we might force the "wrong" type with select into a declare variable
-  longlong val_int() { return (longlong)val_real(); }
-  my_decimal *val_decimal(my_decimal *);
-  String *val_str(String *str);
+  double val();
   void reset_field();
   void update_field();
   Item *result_item(Field *field)
-  { return new Item_avg_field(hybrid_type, this); }
+  { return new Item_avg_field(this); }
   void no_rows_in_result() {}
-  const char *func_name() const { return "avg("; }
+  const char *func_name() const { return "avg"; }
   Item *copy_or_same(THD* thd);
-  Field *create_tmp_field(bool group, TABLE *table, uint convert_blob_length);
 };
 
 class Item_sum_variance;
@@ -411,27 +310,14 @@ class Item_variance_field :public Item_result_field
 {
 public:
   Field *field;
-  Item_result hybrid_type;
-  uint f_precision0, f_scale0;
-  uint f_precision1, f_scale1;
-  uint dec_bin_size0, dec_bin_size1;
-  uint sample;
-  uint prec_increment;
   Item_variance_field(Item_sum_variance *item);
   enum Type type() const {return FIELD_VARIANCE_ITEM; }
-  double val_real();
-  longlong val_int()
-  { /* can't be fix_fields()ed */ return (longlong) val_real(); }
+  double val();
+  longlong val_int() { /* can't be fix_fields()ed */ return (longlong) val(); }
   String *val_str(String*);
-  my_decimal *val_decimal(my_decimal *);
   bool is_null() { (void) val_int(); return null_value; }
-  enum_field_types field_type() const
-  {
-    return hybrid_type == DECIMAL_RESULT ?
-      MYSQL_TYPE_NEWDECIMAL : MYSQL_TYPE_DOUBLE;
-  }
+  enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE; }
   void fix_length_and_dec() {}
-  enum Item_result result_type () const { return hybrid_type; }
 };
 
 
@@ -449,39 +335,30 @@ class Item_variance_field :public Item_result_field
 
 class Item_sum_variance : public Item_sum_num
 {
-  void fix_length_and_dec();
-
-public:
-  Item_result hybrid_type;
   double sum, sum_sqr;
-  my_decimal dec_sum[2], dec_sqr[2];
-  int cur_dec;
   ulonglong count;
-  uint f_precision0, f_scale0;
-  uint f_precision1, f_scale1;
-  uint dec_bin_size0, dec_bin_size1;
-  uint sample;
-  uint prec_increment;
-
-  Item_sum_variance(Item *item_par, uint sample_arg) :Item_sum_num(item_par),
-    hybrid_type(REAL_RESULT), cur_dec(0), count(0), sample(sample_arg)
-    {}
-  Item_sum_variance(THD *thd, Item_sum_variance *item);
+  void fix_length_and_dec()
+  {
+    decimals=min(decimals+4, NOT_FIXED_DEC);
+    maybe_null=1;
+  }
+
+  public:
+  Item_sum_variance(Item *item_par) :Item_sum_num(item_par),count(0) {}
+  Item_sum_variance(THD *thd, Item_sum_variance *item):
+    Item_sum_num(thd, item), sum(item->sum), sum_sqr(item->sum_sqr),
+    count(item->count) {}
   enum Sumfunctype sum_func () const { return VARIANCE_FUNC; }
   void clear();
   bool add();
-  double val_real();
-  my_decimal *val_decimal(my_decimal *);
+  double val();
   void reset_field();
   void update_field();
   Item *result_item(Field *field)
   { return new Item_variance_field(this); }
   void no_rows_in_result() {}
-  const char *func_name() const
-    { return sample ? "var_samp(" : "variance("; }
+  const char *func_name() const { return "variance"; }
   Item *copy_or_same(THD* thd);
-  Field *create_tmp_field(bool group, TABLE *table, uint convert_blob_length);
-  enum Item_result result_type () const { return hybrid_type; }
 };
 
 class Item_sum_std;
@@ -491,10 +368,7 @@ class Item_std_field :public Item_variance_field
 public:
   Item_std_field(Item_sum_std *item);
   enum Type type() const { return FIELD_STD_ITEM; }
-  double val_real();
-  my_decimal *val_decimal(my_decimal *);
-  enum Item_result result_type () const { return REAL_RESULT; }
-  enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE;}
+  double val();
 };
 
 /*
@@ -504,30 +378,26 @@ class Item_std_field :public Item_variance_field
 class Item_sum_std :public Item_sum_variance
 {
   public:
-  Item_sum_std(Item *item_par, uint sample_arg)
-    :Item_sum_variance(item_par, sample_arg) {}
+  Item_sum_std(Item *item_par) :Item_sum_variance(item_par) {}
   Item_sum_std(THD *thd, Item_sum_std *item)
     :Item_sum_variance(thd, item)
     {}
   enum Sumfunctype sum_func () const { return STD_FUNC; }
-  double val_real();
+  double val();
   Item *result_item(Field *field)
     { return new Item_std_field(this); }
-  const char *func_name() const { return "std("; }
+  const char *func_name() const { return "std"; }
   Item *copy_or_same(THD* thd);
-  enum Item_result result_type () const { return REAL_RESULT; }
-  enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE;}
 };
 
 // This class is a string or number function depending on num_func
 
 class Item_sum_hybrid :public Item_sum
 {
-protected:
+ protected:
   String value,tmp_value;
   double sum;
   longlong sum_int;
-  my_decimal sum_dec;
   Item_result hybrid_type;
   enum_field_types hybrid_field_type;
   int cmp_sign;
@@ -538,18 +408,22 @@ class Item_sum_hybrid :public Item_sum
   Item_sum_hybrid(Item *item_par,int sign)
     :Item_sum(item_par), sum(0.0), sum_int(0),
     hybrid_type(INT_RESULT), hybrid_field_type(FIELD_TYPE_LONGLONG),
-    cmp_sign(sign), used_table_cache(~(table_map) 0),
-    was_values(TRUE)
+    cmp_sign(sign), used_table_cache(~(table_map) 0), was_values(TRUE)
   { collation.set(&my_charset_bin); }
-  Item_sum_hybrid(THD *thd, Item_sum_hybrid *item);
-  bool fix_fields(THD *, Item **);
+  Item_sum_hybrid(THD *thd, Item_sum_hybrid *item):
+    Item_sum(thd, item), value(item->value),
+    sum(item->sum), sum_int(item->sum_int), hybrid_type(item->hybrid_type),
+    hybrid_field_type(item->hybrid_field_type),cmp_sign(item->cmp_sign), 
+    used_table_cache(item->used_table_cache),
+    was_values(TRUE)
+    { collation.set(item->collation); }
+  bool fix_fields(THD *, TABLE_LIST *, Item **);
   table_map used_tables() const { return used_table_cache; }
   bool const_item() const { return !used_table_cache; }
 
   void clear();
-  double val_real();
+  double val();
   longlong val_int();
-  my_decimal *val_decimal(my_decimal *);
   void reset_field();
   String *val_str(String *);
   void make_const() { used_table_cache=0; }
@@ -560,12 +434,9 @@ class Item_sum_hybrid :public Item_sum
   void min_max_update_str_field();
   void min_max_update_real_field();
   void min_max_update_int_field();
-  void min_max_update_decimal_field();
   void cleanup();
   bool any_value() { return was_values; }
   void no_rows_in_result();
-  Field *create_tmp_field(bool group, TABLE *table,
-			  uint convert_blob_length);
 };
 
 
@@ -577,7 +448,7 @@ class Item_sum_min :public Item_sum_hybrid
   enum Sumfunctype sum_func () const {return MIN_FUNC;}
 
   bool add();
-  const char *func_name() const { return "min("; }
+  const char *func_name() const { return "min"; }
   Item *copy_or_same(THD* thd);
 };
 
@@ -590,7 +461,7 @@ class Item_sum_max :public Item_sum_hybrid
   enum Sumfunctype sum_func () const {return MAX_FUNC;}
 
   bool add();
-  const char *func_name() const { return "max("; }
+  const char *func_name() const { return "max"; }
   Item *copy_or_same(THD* thd);
 };
 
@@ -611,7 +482,7 @@ class Item_sum_bit :public Item_sum_int
   void reset_field();
   void update_field();
   void fix_length_and_dec()
-  { decimals= 0; max_length=21; unsigned_flag= 1; maybe_null= null_value= 0; }
+  { decimals=0; max_length=21; unsigned_flag=1; maybe_null=null_value=0; }
 };
 
 
@@ -621,7 +492,7 @@ class Item_sum_or :public Item_sum_bit
   Item_sum_or(Item *item_par) :Item_sum_bit(item_par,LL(0)) {}
   Item_sum_or(THD *thd, Item_sum_or *item) :Item_sum_bit(thd, item) {}
   bool add();
-  const char *func_name() const { return "bit_or("; }
+  const char *func_name() const { return "bit_or"; }
   Item *copy_or_same(THD* thd);
 };
 
@@ -632,7 +503,7 @@ class Item_sum_and :public Item_sum_bit
   Item_sum_and(Item *item_par) :Item_sum_bit(item_par, ULONGLONG_MAX) {}
   Item_sum_and(THD *thd, Item_sum_and *item) :Item_sum_bit(thd, item) {}
   bool add();
-  const char *func_name() const { return "bit_and("; }
+  const char *func_name() const { return "bit_and"; }
   Item *copy_or_same(THD* thd);
 };
 
@@ -642,7 +513,7 @@ class Item_sum_xor :public Item_sum_bit
   Item_sum_xor(Item *item_par) :Item_sum_bit(item_par,LL(0)) {}
   Item_sum_xor(THD *thd, Item_sum_xor *item) :Item_sum_bit(thd, item) {}
   bool add();
-  const char *func_name() const { return "bit_xor("; }
+  const char *func_name() const { return "bit_xor"; }
   Item *copy_or_same(THD* thd);
 };
 
@@ -659,21 +530,18 @@ class Item_udf_sum : public Item_sum
   udf_handler udf;
 
 public:
-  Item_udf_sum(udf_func *udf_arg)
-    :Item_sum(), udf(udf_arg)
-  { quick_group=0; }
-  Item_udf_sum(udf_func *udf_arg, List<Item> &list)
-    :Item_sum(list), udf(udf_arg)
+  Item_udf_sum(udf_func *udf_arg) :Item_sum(), udf(udf_arg) { quick_group=0;}
+  Item_udf_sum( udf_func *udf_arg, List<Item> &list )
+    :Item_sum( list ), udf(udf_arg)
   { quick_group=0;}
   Item_udf_sum(THD *thd, Item_udf_sum *item)
-    :Item_sum(thd, item), udf(item->udf)
-  { udf.not_original= TRUE; }
+    :Item_sum(thd, item), udf(item->udf) { udf.not_original= TRUE; }
   const char *func_name() const { return udf.name(); }
-  bool fix_fields(THD *thd, Item **ref)
+  bool fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
   {
     DBUG_ASSERT(fixed == 0);
     fixed= 1;
-    return udf.fix_fields(thd, this, this->arg_count, this->args);
+    return udf.fix_fields(thd,tables,this,this->arg_count,this->args);
   }
   enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }
   virtual bool have_field_update(void) const { return 0; }
@@ -683,27 +551,21 @@ class Item_udf_sum : public Item_sum
   void reset_field() {};
   void update_field() {};
   void cleanup();
-  void print(String *str);
 };
 
 
 class Item_sum_udf_float :public Item_udf_sum
 {
  public:
-  Item_sum_udf_float(udf_func *udf_arg)
-    :Item_udf_sum(udf_arg) {}
+  Item_sum_udf_float(udf_func *udf_arg) :Item_udf_sum(udf_arg) {}
   Item_sum_udf_float(udf_func *udf_arg, List<Item> &list)
-    :Item_udf_sum(udf_arg, list) {}
+    :Item_udf_sum(udf_arg,list) {}
   Item_sum_udf_float(THD *thd, Item_sum_udf_float *item)
     :Item_udf_sum(thd, item) {}
   longlong val_int()
-  {
-    DBUG_ASSERT(fixed == 1);
-    return (longlong) Item_sum_udf_float::val_real();
-  }
-  double val_real();
+    { DBUG_ASSERT(fixed == 1); return (longlong) Item_sum_udf_float::val(); }
+  double val();
   String *val_str(String*str);
-  my_decimal *val_decimal(my_decimal *);
   void fix_length_and_dec() { fix_num_length_and_dec(); }
   Item *copy_or_same(THD* thd);
 };
@@ -712,17 +574,15 @@ class Item_sum_udf_float :public Item_udf_sum
 class Item_sum_udf_int :public Item_udf_sum
 {
 public:
-  Item_sum_udf_int(udf_func *udf_arg)
-    :Item_udf_sum(udf_arg) {}
+  Item_sum_udf_int(udf_func *udf_arg) :Item_udf_sum(udf_arg) {}
   Item_sum_udf_int(udf_func *udf_arg, List<Item> &list)
-    :Item_udf_sum(udf_arg, list) {}
+    :Item_udf_sum(udf_arg,list) {}
   Item_sum_udf_int(THD *thd, Item_sum_udf_int *item)
     :Item_udf_sum(thd, item) {}
   longlong val_int();
-  double val_real()
+  double val()
     { DBUG_ASSERT(fixed == 1); return (double) Item_sum_udf_int::val_int(); }
   String *val_str(String*str);
-  my_decimal *val_decimal(my_decimal *);
   enum Item_result result_type () const { return INT_RESULT; }
   void fix_length_and_dec() { decimals=0; max_length=21; }
   Item *copy_or_same(THD* thd);
@@ -732,72 +592,43 @@ class Item_sum_udf_int :public Item_udf_sum
 class Item_sum_udf_str :public Item_udf_sum
 {
 public:
-  Item_sum_udf_str(udf_func *udf_arg)
-    :Item_udf_sum(udf_arg) {}
+  Item_sum_udf_str(udf_func *udf_arg) :Item_udf_sum(udf_arg) {}
   Item_sum_udf_str(udf_func *udf_arg, List<Item> &list)
     :Item_udf_sum(udf_arg,list) {}
   Item_sum_udf_str(THD *thd, Item_sum_udf_str *item)
     :Item_udf_sum(thd, item) {}
   String *val_str(String *);
-  double val_real()
+  double val()
   {
-    int err_not_used;
+    int err;
     char *end_not_used;
     String *res;
     res=val_str(&str_value);
     return res ? my_strntod(res->charset(),(char*) res->ptr(),res->length(),
-			    &end_not_used, &err_not_used) : 0.0;
+			    &end_not_used, &err) : 0.0;
   }
   longlong val_int()
   {
-    int err_not_used;
-    char *end;
-    String *res;
-    CHARSET_INFO *cs;
-
-    if (!(res= val_str(&str_value)))
-      return 0;                                 /* Null value */
-    cs= res->charset();
-    end= (char*) res->ptr()+res->length();
-    return cs->cset->strtoll10(cs, res->ptr(), &end, &err_not_used);
+    int err;
+    String *res;  res=val_str(&str_value);
+    return res ? my_strntoll(res->charset(),res->ptr(),res->length(),10, (char**) 0, &err) : (longlong) 0;
   }
-  my_decimal *val_decimal(my_decimal *dec);
   enum Item_result result_type () const { return STRING_RESULT; }
   void fix_length_and_dec();
   Item *copy_or_same(THD* thd);
 };
 
-
-class Item_sum_udf_decimal :public Item_udf_sum
-{
-public:
-  Item_sum_udf_decimal(udf_func *udf_arg)
-    :Item_udf_sum(udf_arg) {}
-  Item_sum_udf_decimal(udf_func *udf_arg, List<Item> &list)
-    :Item_udf_sum(udf_arg, list) {}
-  Item_sum_udf_decimal(THD *thd, Item_sum_udf_decimal *item)
-    :Item_udf_sum(thd, item) {}
-  String *val_str(String *);
-  double val_real();
-  longlong val_int();
-  my_decimal *val_decimal(my_decimal *);
-  enum Item_result result_type () const { return DECIMAL_RESULT; }
-  void fix_length_and_dec() { fix_num_length_and_dec(); }
-  Item *copy_or_same(THD* thd);
-};
-
 #else /* Dummy functions to get sql_yacc.cc compiled */
 
 class Item_sum_udf_float :public Item_sum_num
 {
  public:
-  Item_sum_udf_float(udf_func *udf_arg)
-    :Item_sum_num() {}
+  Item_sum_udf_float(udf_func *udf_arg) :Item_sum_num() {}
   Item_sum_udf_float(udf_func *udf_arg, List<Item> &list) :Item_sum_num() {}
   Item_sum_udf_float(THD *thd, Item_sum_udf_float *item)
     :Item_sum_num(thd, item) {}
   enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }
-  double val_real() { DBUG_ASSERT(fixed == 1); return 0.0; }
+  double val() { DBUG_ASSERT(fixed == 1); return 0.0; }
   void clear() {}
   bool add() { return 0; }  
   void update_field() {}
@@ -807,32 +638,13 @@ class Item_sum_udf_float :public Item_sum_num
 class Item_sum_udf_int :public Item_sum_num
 {
 public:
-  Item_sum_udf_int(udf_func *udf_arg)
-    :Item_sum_num() {}
+  Item_sum_udf_int(udf_func *udf_arg) :Item_sum_num() {}
   Item_sum_udf_int(udf_func *udf_arg, List<Item> &list) :Item_sum_num() {}
   Item_sum_udf_int(THD *thd, Item_sum_udf_int *item)
     :Item_sum_num(thd, item) {}
   enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }
   longlong val_int() { DBUG_ASSERT(fixed == 1); return 0; }
-  double val_real() { DBUG_ASSERT(fixed == 1); return 0; }
-  void clear() {}
-  bool add() { return 0; }  
-  void update_field() {}
-};
-
-
-class Item_sum_udf_decimal :public Item_sum_num
-{
- public:
-  Item_sum_udf_decimal(udf_func *udf_arg)
-    :Item_sum_num() {}
-  Item_sum_udf_decimal(udf_func *udf_arg, List<Item> &list)
-    :Item_sum_num() {}
-  Item_sum_udf_decimal(THD *thd, Item_sum_udf_float *item)
-    :Item_sum_num(thd, item) {}
-  enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }
-  double val_real() { DBUG_ASSERT(fixed == 1); return 0.0; }
-  my_decimal *val_decimal(my_decimal *) { DBUG_ASSERT(fixed == 1); return 0; }
+  double val() { DBUG_ASSERT(fixed == 1); return 0; }
   void clear() {}
   bool add() { return 0; }  
   void update_field() {}
@@ -842,15 +654,13 @@ class Item_sum_udf_decimal :public Item_sum_num
 class Item_sum_udf_str :public Item_sum_num
 {
 public:
-  Item_sum_udf_str(udf_func *udf_arg)
-    :Item_sum_num() {}
-  Item_sum_udf_str(udf_func *udf_arg, List<Item> &list)
-    :Item_sum_num() {}
+  Item_sum_udf_str(udf_func *udf_arg) :Item_sum_num() {}
+  Item_sum_udf_str(udf_func *udf_arg, List<Item> &list)  :Item_sum_num() {}
   Item_sum_udf_str(THD *thd, Item_sum_udf_str *item)
     :Item_sum_num(thd, item) {}
   String *val_str(String *)
     { DBUG_ASSERT(fixed == 1); null_value=1; return 0; }
-  double val_real() { DBUG_ASSERT(fixed == 1); null_value=1; return 0.0; }
+  double val() { DBUG_ASSERT(fixed == 1); null_value=1; return 0.0; }
   longlong val_int() { DBUG_ASSERT(fixed == 1); null_value=1; return 0; }
   enum Item_result result_type () const { return STRING_RESULT; }
   void fix_length_and_dec() { maybe_null=1; max_length=0; }
@@ -866,26 +676,15 @@ class MYSQL_ERROR;
 
 class Item_func_group_concat : public Item_sum
 {
+  THD *item_thd;
   TMP_TABLE_PARAM *tmp_table_param;
+  uint max_elements_in_tree;
   MYSQL_ERROR *warning;
-  String result;
-  String *separator;
-  TREE tree_base;
-  TREE *tree;
-  TABLE *table;
-  ORDER **order;
-  Name_resolution_context *context;
-  uint arg_count_order;               // total count of ORDER BY items
-  uint arg_count_field;               // count of arguments
-  uint count_cut_values;
+  uint key_length;
+  bool tree_mode;
   bool distinct;
   bool warning_for_row;
   bool always_null;
-  /*
-    Following is 0 normal object and pointer to original one for copy
-    (to correctly free resources)
-  */
-  Item_func_group_concat *original;
 
   friend int group_concat_key_cmp_with_distinct(void* arg, byte* key1,
 					      byte* key2);
@@ -894,17 +693,34 @@ class Item_func_group_concat : public Item_sum
   friend int group_concat_key_cmp_with_distinct_and_order(void* arg,
 							byte* key1,
 							byte* key2);
-  friend int dump_leaf_key(byte* key,
-                           element_count count __attribute__((unused)),
+  friend int dump_leaf_key(byte* key, uint32 count __attribute__((unused)),
 			   Item_func_group_concat *group_concat_item);
 
-public:
-  Item_func_group_concat(Name_resolution_context *context_arg,
-                         bool is_distinct, List<Item> *is_select,
-                         SQL_LIST *is_order, String *is_separator);
+ public:
+  String result;
+  String *separator;
+  TREE tree_base;
+  TREE *tree;
+  TABLE *table;
+  ORDER **order;
+  TABLE_LIST *tables_list;
+  ulong group_concat_max_len;
+  uint arg_count_order;
+  uint arg_count_field;
+  uint field_list_offset;
+  uint count_cut_values;
+  bool no_appended;
+  /*
+    Following is 0 normal object and pointer to original one for copy 
+    (to correctly free resources)
+  */
+  Item_func_group_concat *original;
+  
+  Item_func_group_concat(bool is_distinct,List<Item> *is_select,
+                         SQL_LIST *is_order,String *is_separator);
 			 
   Item_func_group_concat(THD *thd, Item_func_group_concat *item);
-  ~Item_func_group_concat() {}
+  ~Item_func_group_concat();
   void cleanup();
 
   enum Sumfunctype sum_func () const {return GROUP_CONCAT_FUNC;}
@@ -912,12 +728,12 @@ class Item_func_group_concat : public Item_sum
   virtual Item_result result_type () const { return STRING_RESULT; }
   void clear();
   bool add();
-  void reset_field() {}                         // not used
-  void update_field() {}                        // not used
-  bool fix_fields(THD *,Item **);
+  void reset_field();
+  bool fix_fields(THD *, TABLE_LIST *, Item **);
   bool setup(THD *thd);
   void make_unique();
-  double val_real()
+  virtual void update_field() {}
+  double val()
   {
     String *res;  res=val_str(&str_value);
     return res ? my_atof(res->c_ptr()) : 0.0;
@@ -932,14 +748,8 @@ class Item_func_group_concat : public Item_sum
     end_ptr= (char*) res->ptr()+ res->length();
     return my_strtoll10(res->ptr(), &end_ptr, &error);
   }
-  my_decimal *val_decimal(my_decimal *decimal_value)
-  {
-    return val_decimal_from_string(decimal_value);
-  }
   String* val_str(String* str);
   Item *copy_or_same(THD* thd);
   void no_rows_in_result() {}
   void print(String *str);
-  virtual bool change_context_processor(byte *cntx)
-    { context= (Name_resolution_context *)cntx; return FALSE; }
 };