Adding "const" qualifier to methods Field::eq_def() and

Copy_field::get_copy_func().

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(const Field *field)
+bool Field::eq_def(const Field *field) const
 {
   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(const Field *field)
+bool Field_enum::eq_def(const Field *field) const
 {
   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(const Field *field)
+bool Field_num::eq_def(const Field *field) const
 {
   if (!Field::eq_def(field))
     return 0;

sql/field.h

@@ -792,7 +792,7 @@ 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(const Field *field);
+  virtual bool eq_def(const Field *field) const;
   
   /*
     pack_length() returns size (in bytes) used to store field data in memory
@@ -1518,7 +1518,7 @@ 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(const Field *field);
+  bool eq_def(const Field *field) const;
   int save_in_field(Field *to)
   {
     return to->store(val_int(), MY_TEST(flags & UNSIGNED_FLAG));
@@ -2151,7 +2151,7 @@ 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(const Field *field)
+  bool eq_def(const Field *field) const
   {
     return (Field::eq_def(field) && decimals() == field->decimals());
   }
@@ -3302,7 +3302,7 @@ 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(const Field *field);
+  bool eq_def(const Field *field) const;
   bool has_charset(void) const { return TRUE; }
   /* enum and set are sorted as integers */
   CHARSET_INFO *sort_charset(void) const { return &my_charset_bin; }
@@ -3697,7 +3697,7 @@ class Copy_field :public Sql_alloc {
     get_copy_func.
   */
   typedef void Copy_func(Copy_field*);
-  Copy_func *get_copy_func(Field *to, Field *from);
+  Copy_func *get_copy_func(const Field *to, const Field *from);
 public:
   uchar *from_ptr,*to_ptr;
   uchar *from_null_ptr,*to_null_ptr;

sql/field_conv.cc

@@ -703,7 +703,7 @@ void Copy_field::set(Field *to,Field *from,bool save)
 
 
 Copy_field::Copy_func *
-Copy_field::get_copy_func(Field *to,Field *from)
+Copy_field::get_copy_func(const Field *to, const Field *from)
 {
   if (to->flags & BLOB_FLAG)
   {