Changing the parameter of Field::eq_def() from "Field *" to "const Field *"

sql/field.cc

@@ -8863,7 +8863,7 @@ void Field_set::sql_type(String &res) const
     0  if the fields are unequally defined
 */
 
-bool Field::eq_def(Field *field)
+bool Field::eq_def(const Field *field)
 {
   if (real_type() != field->real_type() || charset() != field->charset() ||
       pack_length() != field->pack_length())
@@ -8895,7 +8895,7 @@ static bool compare_type_names(CHARSET_INFO *charset, TYPELIB *t1, TYPELIB *t2)
   returns 1 if the fields are equally defined
 */
 
-bool Field_enum::eq_def(Field *field)
+bool Field_enum::eq_def(const Field *field)
 {
   TYPELIB *values;
 
@@ -8972,7 +8972,7 @@ const uchar *Field_enum::unpack(uchar *to, const uchar *from,
   @return
   returns 1 if the fields are equally defined
 */
-bool Field_num::eq_def(Field *field)
+bool Field_num::eq_def(const Field *field)
 {
   if (!Field::eq_def(field))
     return 0;

sql/field.h

@@ -775,7 +775,7 @@ class Field: public Value_source
     return (ptr == field->ptr && null_ptr == field->null_ptr &&
             null_bit == field->null_bit && field->type() == type());
   }
-  virtual bool eq_def(Field *field);
+  virtual bool eq_def(const Field *field);
   
   /*
     pack_length() returns size (in bytes) used to store field data in memory
@@ -1501,7 +1501,7 @@ class Field_num :public Field {
   void make_field(Send_field *);
   uint decimals() const { return (uint) dec; }
   uint size_of() const { return sizeof(*this); }
-  bool eq_def(Field *field);
+  bool eq_def(const Field *field);
   int store_decimal(const my_decimal *);
   my_decimal *val_decimal(my_decimal *);
   bool val_bool() { return val_int() != 0; }
@@ -2097,7 +2097,7 @@ class Field_temporal: public Field {
   enum Item_result cmp_type () const { return TIME_RESULT; }
   bool val_bool() { return val_real() != 0e0; }
   uint is_equal(Create_field *new_field);
-  bool eq_def(Field *field)
+  bool eq_def(const Field *field)
   {
     return (Field::eq_def(field) && decimals() == field->decimals());
   }
@@ -3211,7 +3211,7 @@ class Field_enum :public Field_str {
   uint row_pack_length() const { return pack_length(); }
   virtual bool zero_pack() const { return 0; }
   bool optimize_range(uint idx, uint part) { return 0; }
-  bool eq_def(Field *field);
+  bool eq_def(const Field *field);
   bool has_charset(void) const { return TRUE; }
   /* enum and set are sorted as integers */
   CHARSET_INFO *sort_charset(void) const { return &my_charset_bin; }

sql/item.h

@@ -5062,7 +5062,7 @@ class Item_cache: public Item_basic_constant,
   static Item_cache* get_cache(THD *thd, const Item* item, const Item_result type);
   virtual void keep_array() {}
   virtual void print(String *str, enum_query_type query_type);
-  bool eq_def(Field *field) 
+  bool eq_def(const Field *field) 
   { 
     return cached_field ? cached_field->eq_def (field) : FALSE;
   }